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CLEP Introductory Psychology study materials
CLEP Introductory Psychology study resources

CLEP Introductory Psychology practice questions

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Question 1History, Approaches, and Methods

Wilhelm Wundt is best known for establishing which of the following?

  1. The first behaviorist manifesto
  2. The first psychology laboratory Correct answer.
  3. The first psychoanalytic institute
  4. The first intelligence test

Explanation

Wundt founded a laboratory devoted to experimental psychology at Leipzig in 1879, an event often used to mark psychology's emergence as an independent science. His work used introspection to study conscious experience.

Question 2History, Approaches, and Methods

A psychologist who argues that the mind is a set of information-processing systems and uses computer models to explain memory is working from which perspective?

  1. Psychodynamic
  2. Behavioral
  3. Humanistic
  4. Cognitive Correct answer.

Explanation

The cognitive perspective treats mental events as processes that transform information, so computational modeling of memory is its hallmark method. The other perspectives emphasize unconscious conflict, personal growth, or observable behavior.

Question 3History, Approaches, and Methods

Which research design allows a claim about cause and effect?

  1. A naturalistic observation
  2. A controlled experiment Correct answer.
  3. A correlational study
  4. A case study

Explanation

Only a design in which the researcher manipulates an independent variable and controls extraneous factors supports causal inference. Observational and correlational designs describe relationships without establishing direction or causation.

Question 4History, Approaches, and Methods

In an experiment on caffeine and reaction time, participants who drink regular coffee are compared with those who drink decaf. The type of coffee given is which of the following?

  1. A confounding variable
  2. The independent variable Correct answer.
  3. The dependent variable
  4. A control variable

Explanation

The independent variable is the factor the experimenter manipulates, here the caffeine content of the drink. Reaction time, the measured outcome, is the dependent variable.

Question 5History, Approaches, and Methods

Which branch of the nervous system is responsible for returning the body to a calm state after a stressful event?

  1. Sympathetic
  2. Parasympathetic Correct answer.
  3. Sensory
  4. Somatic

Explanation

The parasympathetic division of the autonomic nervous system conserves energy and slows arousal after stress. The sympathetic division produces the opposite fight-or-flight response.

Question 6History, Approaches, and Methods

The principle that a researcher must obtain informed consent and minimize harm to participants is part of which of the following?

  1. Operational definition
  2. Statistical significance
  3. External validity
  4. Research ethics Correct answer.

Explanation

Research ethics govern the treatment of human and animal participants, including consent, confidentiality, and protection from harm. The other terms concern measurement or inference rather than participant welfare.

Question 7History, Approaches, and Methods

A psychologist who studies how natural selection shaped human memory and fear of predators is working from which approach?

  1. Evolutionary Correct answer.
  2. Sociocultural
  3. Behavioral
  4. Cognitive

Explanation

The evolutionary approach explains psychological traits by their adaptive value across ancestral environments. Questions about selection pressures on memory and fear belong to that framework.

Question 8History, Approaches, and Methods

In a distribution of exam scores, the mean is 80 and the median is 65. Which statement best characterizes the distribution?

  1. It is perfectly symmetrical
  2. It is negatively skewed
  3. It is positively skewed Correct answer.
  4. It is bimodal

Explanation

When the mean exceeds the median, a few high scores pull the mean upward, which is the signature of positive skew. In a symmetrical distribution the mean and median coincide.

Question 9History, Approaches, and Methods

A researcher randomly assigns volunteers to a new therapy or a waiting-list condition and measures symptom scores afterward. Which statement is the most serious threat to the study's internal validity?

  1. Participants in the therapy group also begin a new exercise program Correct answer.
  2. The study uses only one therapist
  3. Symptom scores are measured with a standardized scale
  4. Volunteers differ from the general population

Explanation

Internal validity requires that only the manipulated variable differ systematically between groups; a co-occurring lifestyle change in one group confounds the comparison. Limited generalizability affects external validity, not internal validity.

Question 10History, Approaches, and Methods

A study finds a correlation of -0.72 between hours of sleep and reported stress. Which conclusion is best supported?

  1. Less sleep causes higher stress
  2. More sleep is associated with lower reported stress Correct answer.
  3. The relationship is weak and probably due to chance
  4. Stress causes people to sleep less

Explanation

A correlation of -0.72 is strong and negative, meaning the two variables move in opposite directions without establishing causation. Direction of cause cannot be determined from correlational data.

Question 11History, Approaches, and Methods

A researcher wants to know whether a new drug reduces anxiety in a double-blind trial. Which feature of the design most directly controls for expectancy effects?

  1. The sample is large
  2. Anxiety is measured with a validated questionnaire
  3. Participants are randomly assigned to conditions
  4. Neither participants nor assessors know who received the drug Correct answer.

Explanation

Double-blind procedures keep both participants and evaluators unaware of condition assignment, which prevents expectations from biasing reports and ratings. Random assignment addresses group equivalence rather than expectancy.

Question 12History, Approaches, and Methods

A test yields nearly the same score each time it is administered to the same person. The test has high:

  1. Heritability
  2. Standardization
  3. Reliability Correct answer.
  4. Validity

Explanation

Reliability refers to consistency of measurement across occasions or items. Validity concerns whether the test measures the intended construct.

Question 13History, Approaches, and Methods

A researcher covertly observes children on a playground and records aggressive acts without interacting with them. This method is best described as:

  1. Naturalistic observation Correct answer.
  2. A laboratory experiment
  3. A survey
  4. A case study

Explanation

Naturalistic observation involves watching behavior in its usual setting without manipulation. The lack of intervention and the real-world context are its defining features.

Question 14History, Approaches, and Methods

A researcher reports that the difference between two groups was statistically significant at p < .05. This means that:

  1. The null hypothesis is certainly false
  2. There is a 95 percent chance the result will replicate
  3. The effect size is large
  4. The observed difference would occur by chance less than 5 percent of the time if no true difference existed Correct answer.

Explanation

A p value estimates the probability of obtaining results at least as extreme as those observed, assuming the null hypothesis is true. It says nothing directly about effect size or replication probability.

Question 15History, Approaches, and Methods

Which early school of psychology emphasized breaking conscious experience into its basic elements through introspection?

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

Explanation

Structuralism, associated with Titchener, sought to identify the elementary components of conscious experience. Functionalism instead asked what mental processes accomplish.

Question 16History, Approaches, and Methods

A researcher studying memory gives participants a list of words and later asks them to recall as many as possible. The number of words recalled is:

  1. An operational definition of memory performance Correct answer.
  2. A hypothetical construct
  3. A control group
  4. A confounding variable

Explanation

An operational definition specifies the concrete procedure or measure used to represent a concept, here the count of correctly recalled words. Memory itself is the abstract construct being measured.

Question 17History, Approaches, and Methods

A sample is selected so that every member of the population has an equal chance of being chosen. This sampling method is called:

  1. Random sampling Correct answer.
  2. Stratified assignment
  3. Random assignment
  4. Convenience sampling

Explanation

Random sampling gives every population member an equal probability of selection, which supports generalizability. Random assignment instead places selected participants into conditions.

Question 18History, Approaches, and Methods

A researcher finds that students who eat breakfast earn higher grades and concludes that breakfast causes better grades. Which criticism is most appropriate?

  1. The conclusion is flawed because the study used random assignment
  2. Grades are not a valid outcome measure
  3. The sample size must have been too small
  4. The study is correlational, so third variables such as study habits may explain the link Correct answer.

Explanation

Without manipulation and control, a correlation between breakfast and grades could reflect confounds such as socioeconomic status or study habits. Causal language is unjustified from correlational data.

Question 19History, Approaches, and Methods

Which statement best captures the behavioral perspective's stance on studying the mind?

  1. Psychology should map unconscious conflicts onto behavior
  2. Psychology should analyze the basic elements of consciousness
  3. Psychology should focus on observable behavior and the stimuli that control it Correct answer.
  4. Psychology should study the whole person's drive toward growth

Explanation

Behaviorism, especially in Watson's and Skinner's formulations, restricted psychology to observable behavior and environmental contingencies. It deliberately excluded introspection and unconscious processes.

Question 20History, Approaches, and Methods

A researcher uses a placebo control group in a trial of a new antidepressant. The main purpose of the placebo group is to:

  1. Ensure random sampling from the population
  2. Eliminate the need for random assignment
  3. Separate the drug's effect from expectancy and natural improvement Correct answer.
  4. Increase the statistical power of the study

Explanation

A placebo condition holds expectations and time-related change constant so that any added benefit in the treatment group can be attributed to the active ingredient. It complements rather than replaces random assignment.

Question 21History, Approaches, and Methods

A researcher reports that a treatment produced a statistically significant effect, but the effect size is very small. What is the most defensible interpretation?

  1. The result cannot be significant if the effect is small
  2. The measure must be unreliable
  3. The result must be a Type I error
  4. The effect is probably real but may have little practical importance Correct answer.

Explanation

Statistical significance indicates that an effect is unlikely to be zero, whereas effect size indicates its magnitude. A large sample can make a trivial difference statistically detectable.

Question 22History, Approaches, and Methods

A cross-sectional study finds that older adults score lower than younger adults on a memory test. Which alternative explanation is most important to consider?

  1. Cohort differences such as education may differ between age groups Correct answer.
  2. Memory inevitably declines with age
  3. Random assignment failed
  4. The test was too easy for younger adults

Explanation

Cross-sectional designs compare different generations, so age is confounded with cohort-related factors like schooling or technology exposure. Longitudinal designs help separate age from cohort effects.

Question 23History, Approaches, and Methods

A researcher wants to test whether a new measure of empathy predicts helpful behavior in a realistic setting. Which evidence would most directly support the measure's criterion validity?

  1. The measure's items show high internal consistency
  2. Scores on the measure correlate with observed helping Correct answer.
  3. Scores on the measure correlate with another empathy scale
  4. The measure yields the same score on retesting

Explanation

Criterion validity is established when a measure predicts a relevant outcome, here actual helping behavior. Correlations with other scales or with itself address convergent and reliability evidence instead.

Question 24History, Approaches, and Methods

A researcher conducts a meta-analysis of studies on the effect of sleep deprivation on attention. The main advantage of this approach is that it:

  1. Guarantees that the included studies used random assignment
  2. Replaces the need for operational definitions
  3. Combines effect sizes across studies to estimate an overall effect Correct answer.
  4. Eliminates publication bias by including only published work

Explanation

Meta-analysis quantitatively aggregates results across studies, yielding a pooled estimate of effect size and revealing consistency. It cannot guarantee methodological quality or eliminate publication bias.

Question 25Biological Bases of Behavior

Which part of the neuron receives incoming signals from other neurons?

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

Explanation

Dendrites are the branching extensions that collect signals from other neurons and carry them toward the cell body. The axon transmits signals away, myelin insulates, and terminal buttons release neurotransmitter.

Question 26Biological Bases of Behavior

A brief electrical charge that travels down the axon of a neuron is called what?

  1. An action potential Correct answer.
  2. A resting potential
  3. A refractory period
  4. A synaptic gap

Explanation

An action potential is the all-or-none electrical impulse that propagates along the axon when threshold is reached. Resting potential is the neuron's baseline charge, and the refractory period is a recovery interval.

Question 27Biological Bases of Behavior

Which neurotransmitter is most strongly associated with reward, motivation, and the brain's pleasure pathways?

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

Explanation

Dopamine pathways in the midbrain are central to reward learning and motivated behavior. Serotonin relates more to mood and sleep, acetylcholine to muscle and memory functions, and GABA is the main inhibitory transmitter.

Question 28Biological Bases of Behavior

Which brain structure serves as the main relay station that routes sensory information to appropriate cortical areas?

  1. The hypothalamus
  2. The cerebellum
  3. The medulla
  4. The thalamus Correct answer.

Explanation

The thalamus sits atop the brainstem and relays sensory signals (except smell) to the cortex. The hypothalamus regulates internal states, the cerebellum coordinates movement, and the medulla controls vital reflexes.

Question 29Biological Bases of Behavior

The division of the nervous system that calms the body after a stressful event and supports digestion is the what?

  1. Somatic nervous system
  2. Central nervous system
  3. Sympathetic nervous system
  4. Parasympathetic nervous system Correct answer.

Explanation

The parasympathetic branch of the autonomic nervous system promotes rest, digestion, and recovery. The sympathetic branch mobilizes the body for action, while the somatic and central divisions serve other functions.

Question 30Biological Bases of Behavior

Damage to Broca's area in the frontal lobe would most likely produce which difficulty?

  1. Recognizing familiar faces
  2. Forming new long-term memories
  3. Producing fluent speech Correct answer.
  4. Understanding spoken language

Explanation

Broca's area governs the motor production of speech, so damage impairs fluent speech output while comprehension is relatively spared. Wernicke's area handles comprehension, and other regions handle recognition and memory.

Question 31Biological Bases of Behavior

A drug that blocks the reuptake of serotonin would most likely have which immediate effect at the synapse?

  1. It would destroy serotonin receptors on the postsynaptic cell
  2. It would reduce serotonin release from the presynaptic neuron
  3. It would increase serotonin's time in the synaptic gap Correct answer.
  4. It would convert serotonin into dopamine

Explanation

Reuptake is the presynaptic neuron's mechanism for recycling neurotransmitter. Blocking it leaves more serotonin in the synaptic gap for longer, prolonging its effect on receptors.

Question 32Biological Bases of Behavior

Which technique measures electrical activity on the scalp to track brain waves with excellent timing but poor spatial precision?

  1. Transcranial magnetic stimulation
  2. Positron emission tomography
  3. Functional MRI
  4. Electroencephalography Correct answer.

Explanation

EEG records summed electrical activity via scalp electrodes, giving millisecond timing but limited localization. fMRI and PET offer better spatial detail with slower timing, and TMS alters activity rather than passively recording it.

Question 33Biological Bases of Behavior

A split-brain patient is shown an object only in the left visual field. Which response is most consistent with known findings?

  1. The patient can pick out the object by touch but cannot name it Correct answer.
  2. The patient reports seeing the object twice
  3. The patient can name the object easily
  4. The patient cannot perceive the object at all

Explanation

Information from the left visual field crosses to the right hemisphere, which in most people lacks speech output. The patient can guide the correct hand to the object but cannot verbally name it.

Question 34Biological Bases of Behavior

According to the all-or-none principle, how does a stronger stimulus change a single neuron's response?

  1. It increases the rate at which that neuron fires Correct answer.
  2. It produces a larger action potential in that neuron
  3. It lowers the neuron's threshold permanently
  4. It lengthens the refractory period of that neuron

Explanation

Action potentials have a fixed size once threshold is crossed, so intensity is coded by firing frequency rather than by amplitude. Stronger stimuli trigger more frequent firing in a given neuron.

Question 35Biological Bases of Behavior

The endocrine gland often called the 'master gland' because it directs other glands via hormones is the what?

  1. Adrenal gland
  2. Thyroid gland
  3. Pancreas
  4. Pituitary gland Correct answer.

Explanation

The pituitary gland releases hormones that regulate other endocrine glands and is itself controlled by the hypothalamus. The adrenal, thyroid, and pancreas have more specific hormonal roles.

Question 36Biological Bases of Behavior

Which part of the limbic system is most critical for consolidating new declarative memories?

  1. The basal ganglia
  2. The amygdala
  3. The hippocampus Correct answer.
  4. The corpus callosum

Explanation

The hippocampus is essential for forming new explicit memories, as shown by patients with hippocampal damage. The amygdala handles emotional learning, the basal ganglia support procedural habits, and the corpus callosum connects hemispheres.

Question 37Biological Bases of Behavior

A person's pupils dilate, heart rate rises, and digestion slows during a sudden scare. These changes are produced mainly by the what?

  1. Sympathetic branch of the autonomic nervous system Correct answer.
  2. Sensory division of the peripheral nervous system
  3. Parasympathetic branch of the autonomic nervous system
  4. Somatic nervous system

Explanation

The sympathetic branch mobilizes the body for fight-or-flight, producing pupil dilation, faster heart rate, and suppressed digestion. The parasympathetic branch does the opposite, and somatic and sensory divisions serve movement and sensation.

Question 38Biological Bases of Behavior

Which lobe of the cerebral cortex contains the primary visual cortex?

  1. Frontal lobe
  2. Occipital lobe Correct answer.
  3. Parietal lobe
  4. Temporal lobe

Explanation

The occipital lobe at the back of the brain houses the primary visual cortex, where visual signals are first processed. The frontal, parietal, and temporal lobes serve motor, somatosensory, and auditory functions respectively.

Question 39Biological Bases of Behavior

An inhibitory neurotransmitter typically produces which effect on the postsynaptic neuron?

  1. It makes the neuron less likely to fire Correct answer.
  2. It makes the neuron more likely to fire
  3. It rebuilds the myelin sheath
  4. It increases the speed of the action potential

Explanation

Inhibitory transmitters such as GABA hyperpolarize the postsynaptic membrane, moving it away from threshold and reducing the chance of firing. Excitatory transmitters do the reverse.

Question 40Biological Bases of Behavior

A researcher wants to determine whether a specific cortical region is necessary for a task by temporarily disrupting its activity in healthy volunteers. Which method fits best?

  1. Transcranial magnetic stimulation Correct answer.
  2. Electroencephalography
  3. Galvanic skin response
  4. Magnetic resonance imaging

Explanation

TMS uses magnetic pulses to temporarily excite or disrupt a targeted cortical area, allowing causal tests of function. EEG and MRI are correlational recordings, and skin response measures autonomic arousal.

Question 41Biological Bases of Behavior

In most right-handed people, language production is lateralized primarily to which hemisphere?

  1. The left hemisphere Correct answer.
  2. The cerebellum
  3. The right hemisphere
  4. Both hemispheres equally

Explanation

For the large majority of right-handed individuals, the left hemisphere dominates language functions such as speech production. The right hemisphere contributes more to spatial and prosodic processing.

Question 42Biological Bases of Behavior

Repeated stimulation of two nearby neurons is thought to strengthen their connection, a process known as what?

  1. Synaptic pruning
  2. Saltatory conduction
  3. Long-term potentiation Correct answer.
  4. Neurogenesis

Explanation

Long-term potentiation is a lasting increase in synaptic strength following repeated coordinated activity, and it is a leading cellular model of learning. Pruning removes unused connections, neurogenesis creates new neurons, and saltatory conduction speeds impulses.

Question 43Sensation and Perception

The conversion of physical energy from the environment into neural signals is known as:

  1. Transduction Correct answer.
  2. Perception
  3. Accommodation
  4. Adaptation

Explanation

Sensory receptors convert stimulus energy such as light or pressure into electrochemical signals, a process called transduction. Perception is the later interpretation of those signals, not their initial conversion.

Question 44Sensation and Perception

The smallest amount of a stimulus that a person can detect half of the time is called the:

  1. Difference threshold
  2. Weber fraction
  3. Just noticeable difference
  4. Absolute threshold Correct answer.

Explanation

The absolute threshold is defined as the minimum intensity detectable on 50 percent of trials. Difference thresholds concern detecting a change between two stimuli rather than detecting a stimulus from nothing.

Question 45Sensation and Perception

A researcher finds that a person can just barely notice when a 100-gram weight is increased by 2 grams. According to Weber's law, roughly how much added weight would be needed to notice a change from a 500-gram starting weight?

  1. 20 grams
  2. 5 grams
  3. 2 grams
  4. 10 grams Correct answer.

Explanation

Weber's law states that the just noticeable difference is a constant proportion of the original stimulus. The ratio here is 2/100, so 0.02 times 500 grams gives 10 grams.

Question 46Sensation and Perception

Which structure of the eye contains the photoreceptors that transduce light into neural signals?

  1. Retina Correct answer.
  2. Cornea
  3. Iris
  4. Lens

Explanation

The retina lines the back of the eye and holds the rods and cones that convert light into neural activity. The other structures mainly bend or regulate incoming light.

Question 47Sensation and Perception

Rods are especially important for which of the following?

  1. Color vision in bright light
  2. Sharp visual acuity in daylight
  3. Fine detail at the fovea
  4. Detecting dim light and motion Correct answer.

Explanation

Rods are highly sensitive to low light and are distributed widely across the retina, supporting night vision and motion detection. Cones, concentrated at the fovea, handle color and fine detail in bright conditions.

Question 48Sensation and Perception

A person who cannot distinguish red from green most likely has a deficit in:

  1. Cone pigments sensitive to particular wavelengths Correct answer.
  2. The optic chiasm
  3. The lens's ability to focus
  4. Rod function in dim light

Explanation

Color vision depends on different cone types with pigments tuned to short, medium, and long wavelengths. Red-green color blindness reflects altered or missing cone pigments rather than a problem with focusing or light sensitivity.

Question 49Sensation and Perception

The opponent-process theory of color vision best explains which phenomenon?

  1. The ability to see very dim stars
  2. Depth cues from retinal disparity
  3. The blind spot
  4. Afterimages in complementary colors Correct answer.

Explanation

Opponent-process theory proposes that colors are coded in opposing pairs such as red-green and blue-yellow. Staring at one color and then seeing its complement as an afterimage is consistent with this opponent arrangement.

Question 50Sensation and Perception

Hearing loss caused by damage to the hair cells of the cochlea is best described as:

  1. A problem in sound localization
  2. Conductive hearing loss
  3. Presbycusis caused by eardrum stiffening
  4. Sensorineural hearing loss Correct answer.

Explanation

Sensorineural hearing loss results from damage to the inner ear or auditory nerve, including cochlear hair cells. Conductive loss instead involves blockage or damage in the outer or middle ear that impedes sound transmission.