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BCS Written Post-Related Psychology study materials
BCS Written Post-Related Psychology study resources

BCS Written Post-Related Psychology practice questions

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Question 1Introduction to Psychology: Nature, Scope, Schools and Methods

Which school of psychology argued that mental life should be broken down into its basic elements through trained introspection?

  1. Structuralism Correct answer.
  2. Functionalism
  3. Gestalt psychology
  4. Behaviourism

Explanation

Structuralism, associated with Wundt and Titchener, treated consciousness as a compound that could be analysed into elementary sensations, images and feelings. Its main method was controlled introspection by trained observers. Functionalism, Gestalt psychology and behaviourism each rejected this element-by-element approach for different reasons.

Question 2Introduction to Psychology: Nature, Scope, Schools and Methods

A researcher wants to establish whether watching violent video clips causes a temporary rise in aggressive behaviour. Which method gives the strongest basis for a causal claim?

  1. A case study of one highly aggressive adolescent
  2. A naturalistic observation of children in a playground
  3. A correlational survey of teenagers' viewing habits
  4. A controlled laboratory experiment with random assignment Correct answer.

Explanation

Causal conclusions require the researcher to manipulate the suspected cause while controlling other variables, and random assignment spreads pre-existing differences evenly across groups. Only a controlled experiment with random assignment meets these conditions. Observational, correlational and case-study designs can reveal associations or rich detail but cannot rule out alternative explanations.

Question 3Introduction to Psychology: Nature, Scope, Schools and Methods

Which statement best captures the scope of psychology as an academic discipline?

  1. It studies only observable motor behaviour in laboratory settings
  2. It studies behaviour and mental processes across humans and other animals Correct answer.
  3. It studies only conscious experience reported by trained adults
  4. It studies only diagnosed mental disorders and their treatment

Explanation

Psychology is conventionally defined as the scientific study of behaviour and mental processes, and it ranges over perception, learning, memory, emotion, development, social interaction and abnormality. It includes both human and animal research and both normal and disordered functioning. Any definition restricting the field to one topic or one population is too narrow.

Question 4Introduction to Psychology: Nature, Scope, Schools and Methods

In a study of sleep and exam performance, students who slept more also scored higher. A journalist concludes that sleep causes better scores. Which criticism of this conclusion is most appropriate?

  1. The correlation may reflect a third variable such as prior preparation or motivation Correct answer.
  2. Correlations below 0.9 can never be interpreted meaningfully
  3. The finding is invalid because the sample included students only
  4. Sleep cannot be measured reliably enough for any research

Explanation

A correlation between two variables does not by itself establish which one influences the other, and a third variable may drive both. Motivation, study habits or prior knowledge could raise both sleep quality and exam scores. Causal claims need experimental manipulation or strong longitudinal and statistical control.

Question 5Introduction to Psychology: Nature, Scope, Schools and Methods

Who established the first laboratory dedicated to experimental psychology, at Leipzig in 1879?

  1. Sigmund Freud
  2. Wilhelm Wundt Correct answer.
  3. William James
  4. John B. Watson

Explanation

Wilhelm Wundt founded the Leipzig laboratory in 1879, an event traditionally treated as the birth of psychology as an independent experimental science. He also promoted introspection under controlled conditions and wrote extensively on physiological psychology. James, Freud and Watson made major contributions but did not found this laboratory.

Question 6Introduction to Psychology: Nature, Scope, Schools and Methods

A psychologist argues that depression is best understood by examining how negative thought patterns, family reinforcement and workplace stress interact. This position most closely reflects which approach?

  1. An eclectic biopsychosocial approach Correct answer.
  2. A classical introspectionist account
  3. A pure behaviourist account
  4. A strict biological reductionism

Explanation

The biopsychosocial approach treats disorder as the joint product of biological, psychological and social influences, which matches the combination of cognition, reinforcement and occupational stress described. It deliberately integrates levels of explanation rather than reducing them to one. Reductionist and single-school accounts would exclude most of these factors.

Question 7Introduction to Psychology: Nature, Scope, Schools and Methods

Which feature distinguishes a hypothesis from a theory in psychological research?

  1. A hypothesis is a specific testable prediction, whereas a theory is a broader organised explanation Correct answer.
  2. A hypothesis is always proven true, whereas a theory remains speculative
  3. A hypothesis applies only to animals, whereas a theory applies only to humans
  4. A hypothesis is written after data collection, whereas a theory is written before

Explanation

A theory is an organised set of principles that explains a body of findings and generates further predictions. A hypothesis is a narrow, operationalised prediction derived from a theory and tested against data. Neither is simply proven; theories are supported, revised or rejected as evidence accumulates.

Question 8Introduction to Psychology: Nature, Scope, Schools and Methods

In an experiment on caffeine and reaction time, participants are randomly allocated to a caffeine or a decaffeinated drink. What is the dependent variable?

  1. The presence or absence of caffeine
  2. The participants' prior caffeine habits
  3. The measured reaction time Correct answer.
  4. The random allocation procedure

Explanation

The dependent variable is the outcome that is measured to see whether the manipulation had an effect, which here is reaction time. The independent variable is the caffeine manipulation, and random allocation is a control procedure. Prior habits would be a potential confounding variable to control or balance.

Question 9Introduction to Psychology: Nature, Scope, Schools and Methods

A clinical psychologist uses a structured interview plus a standardised questionnaire to diagnose a client, rather than relying on a single session impression. Which principle of psychological assessment does this best illustrate?

  1. Triangulation across multiple sources of evidence Correct answer.
  2. Reliance on a single authoritative source
  3. Exclusive dependence on projective techniques
  4. Avoidance of any standardised measurement

Explanation

Combining a structured interview with a standardised questionnaire illustrates triangulation, in which converging evidence from independent sources increases confidence in a conclusion. Standardised instruments also improve reliability and comparability across clients. Single-source impressions are more vulnerable to bias and error.

Question 10Introduction to Psychology: Nature, Scope, Schools and Methods

Which statement accurately describes the psychoanalytic approach developed by Freud?

  1. It holds that behaviour is shaped mainly by observable reinforcement contingencies
  2. It treats mental experience as organised wholes governed by perceptual laws
  3. It emphasises unconscious conflicts and early childhood experiences as determinants of personality Correct answer.
  4. It explains behaviour solely through inherited neural structures

Explanation

Psychoanalysis holds that unconscious drives and conflicts, many rooted in early childhood, shape personality and behaviour, and it uses techniques such as free association and dream analysis. Its emphasis on hidden mental dynamics contrasts with behaviourism, Gestalt psychology and biological reductionism. Later psychodynamic writers modified but retained this core emphasis.

Question 11Introduction to Psychology: Nature, Scope, Schools and Methods

A researcher studies how people remember a list of words in a quiet laboratory. Which limitation of this method most directly threatens the ecological validity of the findings?

  1. The statistical analysis may use parametric tests
  2. The participants may be paid for taking part
  3. The sample size may be smaller than in a survey
  4. The laboratory setting and word list may not resemble everyday memory tasks Correct answer.

Explanation

Ecological validity concerns whether findings generalise to real-world settings and tasks. A quiet laboratory with an artificial word list may produce results that do not predict memory in noisy, meaningful everyday situations. Sample size, choice of statistical test and payment affect other aspects of a study but not ecological validity directly.

Question 12Introduction to Psychology: Nature, Scope, Schools and Methods

Which pair correctly matches a school of psychology with its central emphasis?

  1. Behaviourism - unconscious conflict
  2. Functionalism - analysis of experience into elements
  3. Gestalt psychology - organised perceptual wholes Correct answer.
  4. Structuralism - adaptive functions of consciousness

Explanation

Gestalt psychology, associated with Wertheimer, Koffka and Köhler, argued that perception and thought are organised into structured wholes that cannot be reduced to elementary parts. The other pairings exchange the emphases of the schools. Matching each school to its central claim is a basic way to keep the history of psychology straight.

Question 13Introduction to Psychology: Nature, Scope, Schools and Methods

A study finds that participants who were told a task measures leadership scored higher on it than participants told it measures sociability. What concept best explains this result?

  1. Experimenter demand characteristics
  2. Random sampling error
  3. Regression to the mean
  4. Participant expectancy effects Correct answer.

Explanation

When participants infer what a study is designed to show, their behaviour may shift toward the expected result, which is a participant expectancy or demand effect. The label given to the task supplied the cue about the researcher's hypothesis. Experimenter effects arise from the researcher's own behaviour, sampling error concerns who was recruited, and regression to the mean concerns extreme scores moving toward average on retesting.

Question 14Introduction to Psychology: Nature, Scope, Schools and Methods

Which research design follows the same individuals over an extended period to track developmental change?

  1. Longitudinal design Correct answer.
  2. Case-control design
  3. Correlational design
  4. Cross-sectional design

Explanation

A longitudinal design repeatedly measures the same participants over time, so it can reveal within-person change and stability. A cross-sectional design compares different age groups at one point in time. Case-control and correlational designs address different questions and are not defined by repeated measurement of the same cohort.

Question 15Introduction to Psychology: Nature, Scope, Schools and Methods

A psychologist explains that people help others because helping has historically improved the survival of relatives who share their genes. This explanation most clearly reflects which perspective?

  1. Psychodynamic psychology
  2. Evolutionary psychology Correct answer.
  3. Cognitive psychology
  4. Humanistic psychology

Explanation

Evolutionary psychology explains social behaviour through selection pressures acting on ancestral populations, including kin selection and inclusive fitness. The emphasis on genetic survival of relatives is the signature of that perspective. Humanistic, cognitive and psychodynamic perspectives explain helping through growth, information processing or unconscious conflict respectively.

Question 16Introduction to Psychology: Nature, Scope, Schools and Methods

Which statement about the use of introspection in early psychology is most accurate?

  1. It relied on observers' retrospective accounts of childhood memories
  2. It involved measuring reaction time to infer unconscious motives
  3. It required trained observers to report their immediate conscious experiences under controlled conditions Correct answer.
  4. It was rejected by Wundt but adopted enthusiastically by Titchener

Explanation

Early introspection required trained observers to describe immediate conscious contents, such as sensations and feelings, under standardised laboratory conditions. Its reliability was disputed because reports varied between observers and could not be independently verified. Wundt and Titchener both used introspective methods, although they differed over how experience should be analysed.

Question 17Introduction to Psychology: Nature, Scope, Schools and Methods

A researcher wants to reduce the risk that neither participants nor the person scoring the outcome knows who received the treatment. Which procedure should be used?

  1. Double-blind procedure Correct answer.
  2. Single-blind procedure
  3. Open-label procedure
  4. Matched-pairs assignment

Explanation

In a double-blind procedure both the participants and the persons administering or scoring the intervention are unaware of condition assignment, which reduces expectancy and experimenter bias. A single-blind procedure conceals assignment from only one of these parties. Open-label procedures conceal nothing, and matched-pairs assignment concerns how participants are allocated rather than who knows the condition.

Question 18Introduction to Psychology: Nature, Scope, Schools and Methods

Which issue arises when a researcher generalises findings from a sample of university students to the whole adult population?

  1. A failure of random assignment
  2. A threat to external validity Correct answer.
  3. A threat to internal validity
  4. A failure of inter-rater reliability

Explanation

External validity concerns whether results generalise beyond the specific sample and setting studied. University students differ from the wider adult population in age, education and other characteristics, so extending the findings is risky. Internal validity concerns causal inference within the study, whereas random assignment and inter-rater reliability are separate methodological matters.

Question 19Introduction to Psychology: Nature, Scope, Schools and Methods

Which approach in psychology holds that people are inherently motivated toward growth, self-actualisation and fulfilling their potential?

  1. Biological psychology
  2. Behaviourism
  3. Humanistic psychology Correct answer.
  4. Structuralism

Explanation

Humanistic psychology, associated with Maslow and Rogers, centres on conscious experience, personal growth and the drive toward self-actualisation. It rejects both behaviourist reduction to reinforcement and psychodynamic reduction to unconscious conflict. Behaviourism, biological psychology and structuralism each emphasise different explanatory concepts.

Question 20Introduction to Psychology: Nature, Scope, Schools and Methods

A researcher reports that an intervention produced a statistically significant improvement with a large effect size, but the improvement was only two points on a hundred-point scale. What is the most appropriate interpretation?

  1. The result is statistically detectable but may have limited practical importance Correct answer.
  2. The result is practically meaningful because it was statistically significant
  3. The result proves the intervention should replace all existing treatments
  4. The result is invalid because effect size and significance cannot both be reported

Explanation

Statistical significance indicates that a difference is unlikely to be due to chance, whereas effect size and the size of the raw change indicate practical importance. A detectable but tiny change on a hundred-point scale may matter little in practice. Significance and effect size are complementary and are normally reported together.

Question 21Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Which part of the neuron is primarily responsible for receiving incoming signals from other neurons?

  1. The terminal buttons
  2. The myelin sheath
  3. The dendrites Correct answer.
  4. The axon hillock

Explanation

Dendrites are branching extensions that carry receptor sites and collect synaptic input from upstream neurons, converting it into graded local potentials that spread toward the cell body. The axon hillock integrates those potentials, myelin speeds conduction, and terminal buttons release transmitter, so none of these performs the receiving role.

Question 22Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

An action potential is generated when membrane depolarisation reaches which point?

  1. The resting membrane potential
  2. The refractory period
  3. The equilibrium potential for chloride
  4. The threshold potential Correct answer.

Explanation

Voltage-gated sodium channels open in sufficient numbers only once the membrane is depolarised to threshold, producing the explosive inward sodium current that constitutes the spike. Resting potential is the baseline before stimulation, chloride equilibrium concerns inhibition, and the refractory period follows the spike rather than triggering it.

Question 23Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Which neurotransmitter is most closely associated with the reward pathway projecting from the ventral tegmental area to the nucleus accumbens?

  1. Glutamate
  2. Acetylcholine
  3. GABA
  4. Dopamine Correct answer.

Explanation

Dopaminergic projections from the ventral tegmental area to the nucleus accumbens and prefrontal cortex form the mesolimbic reward circuit implicated in motivation and reinforcement. GABA and glutamate are the main inhibitory and excitatory transmitters of the brain generally, and acetylcholine serves neuromuscular and cortical arousal functions.

Question 24Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Damage to the medulla oblongata would most directly threaten which function?

  1. Production of fluent speech
  2. Processing of visual motion
  3. Storage of new declarative memories
  4. Regulation of breathing and heart rate Correct answer.

Explanation

The medulla contains vital autonomic centres controlling respiration, cardiac rhythm and blood pressure, so lesions there can be life threatening. Speech production depends on cortical and cerebellar circuits, memory consolidation on the hippocampus, and motion processing on visual association cortex.

Question 25Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Which gland is often called the master endocrine gland because it controls the activity of several other endocrine organs?

  1. The thyroid gland
  2. The adrenal medulla
  3. The pineal gland
  4. The pituitary gland Correct answer.

Explanation

The anterior pituitary secretes trophic hormones such as ACTH, TSH and the gonadotropins that regulate the adrenal cortex, thyroid and gonads, which is why it is termed the master gland. The pineal secretes melatonin, the thyroid responds to pituitary TSH, and the adrenal medulla is controlled neurally.

Question 26Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

The brief period after an action potential during which a neuron cannot fire again regardless of stimulus strength is called what?

  1. The absolute refractory period Correct answer.
  2. The saltatory conduction phase
  3. The relative refractory period
  4. The postsynaptic potential

Explanation

During the absolute refractory period sodium channel inactivation gates are closed, so no stimulus however strong can generate a second spike, which enforces the maximum firing rate and one-way travel of the impulse. The relative refractory period allows firing with a stronger stimulus, and the other terms describe different phenomena.

Question 27Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

A patient shows intact comprehension but halting, effortful, telegraphic speech after a left frontal lesion. Which region is most likely damaged?

  1. Broca's area Correct answer.
  2. The occipital pole
  3. The right parietal lobule
  4. Wernicke's area

Explanation

Broca's area in the left inferior frontal gyrus supports speech production, so damage yields non-fluent output with relatively preserved comprehension. Wernicke's area damage produces fluent but meaningless speech with poor comprehension, and the occipital and parietal sites serve visual and spatial functions.

Question 28Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Reuptake inhibitors such as SSRIs raise synaptic serotonin levels mainly by acting on which element?

  1. The myelin sheath of the raphe axons
  2. The presynaptic transporter protein Correct answer.
  3. The enzyme that synthesises serotonin
  4. The postsynaptic receptor binding site

Explanation

Serotonin reuptake inhibitors block the presynaptic transporter that normally clears transmitter from the cleft, prolonging its presence and repeated receptor stimulation. They do not occupy the postsynaptic receptor, do not directly block synthesis enzymes, and have no action on myelin.

Question 29Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Which statement best describes the relationship between the sympathetic and parasympathetic divisions?

  1. They generally exert opposing effects on the same organs to maintain homeostasis. Correct answer.
  2. The parasympathetic division innervates only skeletal muscle.
  3. They are always active simultaneously with identical effects on each organ.
  4. The sympathetic division acts solely through the release of acetylcholine.

Explanation

The two autonomic branches typically produce opposing adjustments, such as sympathetic acceleration and parasympathetic slowing of the heart, allowing fine homeostatic control. They are not identical in effect, the parasympathetic system does not innervate skeletal muscle, and sympathetic postganglionic fibres release mainly noradrenaline.

Question 30Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

A researcher lesions the suprachiasmatic nucleus of a rodent kept in constant darkness. What is the most likely outcome?

  1. The animal's body temperature becomes perfectly constant.
  2. The animal loses all ability to sleep.
  3. The animal can no longer form new memories.
  4. The animal's circadian rhythms become free-running and unsynchronised. Correct answer.

Explanation

The suprachiasmatic nucleus is the master circadian pacemaker that entrains internal rhythms to the light-dark cycle via retinal input. Without it, rhythms in constant darkness drift and lose coherence. Total sleep loss, memory failure and perfect thermal constancy are not the expected consequences.

Question 31Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

The hypothalamus influences the anterior pituitary chiefly through which mechanism?

  1. Direct neural synapses onto pituitary hormone cells
  2. Retrograde transport along pituitary axons
  3. Release of releasing and inhibiting hormones into the portal blood supply Correct answer.
  4. Diffusion of cerebrospinal fluid into the pituitary gland

Explanation

Hypothalamic neurosecretory cells discharge releasing and inhibiting hormones into the hypophyseal portal vessels, which carry them directly to the anterior pituitary. The anterior pituitary is glandular tissue without direct neural innervation of its secretory cells, and the other options describe mechanisms that do not operate there.

Question 32Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Long-term potentiation at hippocampal synapses is most commonly initiated by which receptor?

  1. The dopamine D2 receptor
  2. The GABA-A receptor
  3. The nicotinic acetylcholine receptor
  4. The NMDA glutamate receptor Correct answer.

Explanation

The NMDA receptor acts as a coincidence detector, admitting calcium only when glutamate binds and the membrane is sufficiently depolarised to relieve its magnesium block. That calcium influx triggers the kinase cascades that strengthen the synapse. The other receptors do not provide this coincidence detection at hippocampal synapses.

Question 33Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Which structure provides the major output route from the basal ganglia to the thalamus and cortex?

  1. The inferior colliculus
  2. The globus pallidus internus and substantia nigra pars reticulata Correct answer.
  3. The amygdala and hippocampus
  4. The lateral geniculate nucleus

Explanation

The internal segment of the globus pallidus and the substantia nigra pars reticulata are the basal ganglia's main inhibitory output nuclei, projecting to the thalamus and thereby gating cortical motor activity. The amygdala, hippocampus, lateral geniculate nucleus and inferior colliculus belong to other systems.

Question 34Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

A drug blocks voltage-gated sodium channels in a peripheral nerve. Which immediate consequence is expected?

  1. Myelin degenerates within seconds.
  2. Synaptic vesicles fuse with the membrane spontaneously.
  3. The resting membrane potential becomes permanently positive.
  4. Action potentials fail to be generated or propagated. Correct answer.

Explanation

Voltage-gated sodium channels carry the inward current that depolarises the membrane during the spike, so blockade prevents spike initiation and conduction. Resting potential is largely maintained by other conductances, vesicle fusion depends on calcium entry, and myelin breakdown is a slow structural process.

Question 35Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Which cortical region is the primary receiving area for somatosensory information from the body?

  1. The precentral gyrus
  2. The cingulate gyrus
  3. The postcentral gyrus Correct answer.
  4. The superior temporal gyrus

Explanation

The postcentral gyrus houses primary somatosensory cortex, where touch, proprioception and pain signals relayed through the thalamus are represented. The precentral gyrus is motor cortex, the superior temporal gyrus auditory cortex, and the cingulate gyrus contributes to emotion and pain affect.

Question 36Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Cortisol released during prolonged stress can impair memory because hippocampal neurons are richly supplied with which receptor type?

  1. Mu opioid receptors
  2. Nicotinic acetylcholine receptors
  3. Mineralocorticoid and glucocorticoid receptors Correct answer.
  4. D1 dopamine receptors

Explanation

The hippocampus expresses high densities of mineralocorticoid and glucocorticoid receptors, so sustained cortisol elevation can suppress plasticity and damage neurons. Acetylcholine, dopamine and opioid receptors modulate other functions and are not the principal mediators of cortisol's hippocampal effects.

Question 37Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

In a split-brain patient, an object placed in the left hand and hidden from view is typically named correctly only if which condition holds?

  1. The corpus callosum is intact.
  2. The object is also presented to the right visual field.
  3. The object is presented only to the left visual field.
  4. Information reaches the left hemisphere, for example via the right visual field. Correct answer.

Explanation

Somatosensory input from the left hand projects to the right hemisphere, which in most people lacks expressive language. Naming therefore requires the information to reach the left hemisphere, either through the right visual field or an intact callosum. With the callosum severed, left-visual-field input alone cannot be verbalised.

Question 38Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

A lesion of the ventromedial prefrontal cortex in an adult most characteristically produces which pattern?

  1. Profound anterograde amnesia with preserved social conduct
  2. Complete loss of language comprehension
  3. Impaired decision-making and social judgement with relatively intact intellect Correct answer.
  4. Dense neglect of the contralateral body side

Explanation

Ventromedial prefrontal damage classically leaves IQ and memory largely intact while disrupting emotion-guided decision-making, impulse control and social judgement, as in the well-documented Phineas Gage-type presentation. Amnesia, aphasia and hemispatial neglect follow temporal, perisylvian and parietal lesions respectively.

Question 39Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Why does a drug that increases dopamine release in the nucleus accumbens tend to produce sensitisation with repeated intermittent administration?

  1. Receptor numbers fall so rapidly that remaining receptors become hypersensitive within minutes
  2. Repeated bursts drive persistent synaptic remodelling that amplifies later responses Correct answer.
  3. Dopamine is converted into noradrenaline in the accumbens
  4. The drug permanently destroys all dopaminergic terminals

Explanation

Intermittent stimulant exposure triggers lasting changes in spine density, receptor trafficking and signalling cascades in the accumbens, so the same dose evokes a progressively larger behavioural and neural response. Immediate receptor supersensitivity from mass destruction, terminal loss and transmitter conversion are not the mechanisms described.

Question 40Biological Bases of Behaviour: Nervous System, Brain and Endocrine Influences

Bilateral damage to the amygdala would most likely leave a person with which deficit?

  1. Inability to recognise familiar faces
  2. Inability to store new motor skills
  3. Loss of the ability to perceive colour
  4. Impaired acquisition of conditioned fear responses Correct answer.

Explanation

The amygdala is essential for associating a neutral cue with an aversive outcome, so bilateral damage blocks fear conditioning and reduces appropriate fear learning. Face recognition depends on fusiform cortex, colour vision on ventral occipital areas, and motor skill learning on the basal ganglia and cerebellum.

Question 41Sensation, Perception, Attention and States of Consciousness

In signal detection theory, what does the term 'criterion' (response bias) refer to?

  1. The physical intensity of the stimulus at which detection becomes possible
  2. The proportion of trials on which the observer correctly detects a signal
  3. The observer's internal threshold for deciding that a signal is present Correct answer.
  4. The variability of the observer's sensory system across trials

Explanation

Signal detection theory separates sensitivity (d-prime) from the decision criterion. The criterion is the internal cutoff the observer uses to convert a noisy sensory impression into a 'yes' or 'no' response, and it shifts with payoffs, expectations, and motivation.

Question 42Sensation, Perception, Attention and States of Consciousness

Which structure is primarily responsible for focusing light onto the retina by changing its curvature?

  1. The cornea
  2. The iris
  3. The sclera
  4. The lens Correct answer.

Explanation

The lens adjusts its shape through accommodation to bring light to a sharp focus on the retina. The cornea provides most of the eye's fixed refractive power but does not change curvature for focusing.

Question 43Sensation, Perception, Attention and States of Consciousness

What is the function of the ossicles in the middle ear?

  1. They amplify and transmit vibrations to the oval window Correct answer.
  2. They equalize pressure between the ear and the throat
  3. They transduce sound into neural impulses
  4. They detect the direction of incoming sound waves

Explanation

The malleus, incus, and stapes form a lever system that amplifies airborne vibrations and passes them to the oval window of the cochlea. Transduction into neural signals occurs later, in the hair cells of the inner ear.

Question 44Sensation, Perception, Attention and States of Consciousness

The gate-control theory of pain proposes that pain perception is modulated by which mechanism?

  1. The release of endorphins in the adrenal glands
  2. Habituation of pain receptors in the skin
  3. Direct inhibition of pain by the visual cortex
  4. Competition between tactile and pain signals at a spinal gating site Correct answer.

Explanation

Gate-control theory holds that signals from large tactile fibers can inhibit transmission of pain signals at a gate in the spinal cord. This explains why rubbing an injured area can reduce felt pain.

Question 45Sensation, Perception, Attention and States of Consciousness

According to the trichromatic theory, color vision depends on which arrangement?

  1. A single type of cone responding to all wavelengths
  2. Opponent pairs of red-green and blue-yellow channels
  3. Rod cells that fire in complementary pairs
  4. Three types of cones with different wavelength sensitivities Correct answer.

Explanation

The trichromatic theory states that three cone types, sensitive to short, medium, and long wavelengths, produce color experience through their relative activation. Opponent-process mechanisms are a separate, complementary account.

Question 46Sensation, Perception, Attention and States of Consciousness

Which Gestalt principle causes us to perceive elements that are close together as belonging to a group?

  1. Similarity
  2. Proximity Correct answer.
  3. Closure
  4. Continuity

Explanation

The principle of proximity holds that stimuli near one another are grouped perceptually. This grouping occurs even when the elements differ in other features such as color or shape.

Question 47Sensation, Perception, Attention and States of Consciousness

A driver scanning a busy intersection fails to notice a cyclist because attention is fixed on a traffic light. Which phenomenon does this illustrate?

  1. Binocular rivalry
  2. Change blindness
  3. The cocktail-party effect
  4. Inattentional blindness Correct answer.

Explanation

Inattentional blindness occurs when an unexpected object goes unnoticed because attention is engaged by another task. Change blindness instead involves failing to detect a change after it has occurred.

Question 48Sensation, Perception, Attention and States of Consciousness

In a dichotic listening task, a participant repeats aloud the message played to one ear while ignoring the other. What does the shadowing procedure mainly demonstrate?

  1. That selective attention filters out most unattended content Correct answer.
  2. That divided attention improves with practice
  3. That auditory memory is unlimited in capacity
  4. That unattended speech is fully processed for meaning

Explanation

Shadowing shows that people can report little about the ignored channel beyond physical features such as pitch or voice. This supports early filtering models in which unattended information receives limited semantic processing.

Question 49Sensation, Perception, Attention and States of Consciousness

Which theory of attention proposes that unattended stimuli are attenuated rather than completely blocked?

  1. Treisman's attenuation model Correct answer.
  2. Deutsch and Deutsch's late-selection model
  3. Broadbent's filter model
  4. Kahneman's capacity model

Explanation

Treisman proposed that the unattended channel is weakened rather than eliminated, so highly salient items such as one's own name can still break through. This reconciles early filtering with the cocktail-party phenomenon.

Question 50Sensation, Perception, Attention and States of Consciousness

A person reports feeling alert and focused after two cups of coffee. Which drug classification best fits caffeine's primary action?

  1. A depressant that slows central nervous system activity
  2. An opiate that relieves pain and induces euphoria
  3. A stimulant that increases central nervous system activity Correct answer.
  4. A hallucinogen that distorts sensory perception

Explanation

Caffeine is a stimulant that blocks adenosine receptors, increasing alertness and reducing drowsiness. Its effects on arousal and vigilance are opposite to those of depressants.