Skinner believed reinforcement directly shapes behavior acquisition. Bandura, however, argued that reinforcement primarily influences the performance of a learned behavior, not necessarily its initial acquisition, which can occur through observation.
According to Rescorla, the strength of a conditioned response depends on the contingency, or predictive value, of the CS for the UCS. This means the percentage of trials where the CS reliably predicts the UCS is crucial.
Instinctive drift refers to the tendency of an animal to revert to innate, species-specific behaviors that interfere with a conditioned response. This phenomenon highlights the biological constraints on learning, making other options incorrect.
The two-process theory states that fear is initially acquired through classical conditioning and then maintained through operant conditioning, where avoidance behavior is negatively reinforced. Other options misrepresent this dual process.
Both positive and negative reinforcement strengthen or increase the likelihood of a behavior. Positive reinforcement adds a desirable stimulus, while negative reinforcement removes an aversive one, both leading to increased responding.
A variable ratio schedule delivers reinforcement after an unpredictable number of responses, leading to high, steady rates of responding, like slot machine play. Other schedules produce different response patterns, such as pauses or less consistent rates.
Primary reinforcers are inherently satisfying due to biological needs, while secondary reinforcers gain their reinforcing power through association with primary reinforcers. Options B, C, and D incorrectly describe the fundamental nature of these reinforcers.
In a Skinner box, the dependent variable is the rate of responding, which measures how frequently the subject performs the operant behavior. Other options are either independent variables or irrelevant to the primary measurement.
The distinction between classical and operant conditioning is not absolute; both types often interactively govern behavior, rather than exclusively regulating specific response types. This nuanced view is more accurate than strict separation.
Higher-order conditioning shows that an established conditioned stimulus (CS) can substitute for a natural unconditioned stimulus (UCS) to condition a new response. This means a new neutral stimulus can become a CS.
Albert's fear of other white, furry objects is due to stimulus generalization, where a conditioned response spreads to stimuli similar to the original conditioned stimulus. Acquisition is the initial learning, not the spread.
The nightgown is a conditioned stimulus because it was initially neutral but, through repeated association with "outing" (unconditioned stimulus), it now triggers Sam's arousal (conditioned response). It's a learned signal.
Salivation to the tone is a conditioned response because it is a learned reaction to a previously neutral stimulus (the tone). The tone becomes the conditioned stimulus, while meat powder is the unconditioned stimulus.
Empirical evidence strongly supports hemispheric specialization, showing different cognitive tasks are handled by distinct hemispheres. The other options, like separate consciousness streams or "right-brained" individuals, are largely unsupported or oversimplified concepts.
A mutation is a spontaneous, heritable change in DNA sequence, crucial for evolution. Genetic drift and gene flow are population-level changes, and an adaptation is a beneficial trait, making option D correct.
Phenotype refers to an organism's observable physical characteristics, like hair color, eye color, and height, resulting from genotype and environment. Genotype is genetic makeup, making option B correct.
The correct answer is Neurotransmitters. This question tests your understanding of the analogy between the two major communication systems in the body: the endocrine system and the nervous system. Both systems rely on chemical messengers to transmit signals, but they use different types of molecules and pathways.
Thus, the correct analogy is: Hormones are to the endocrine system as neurotransmitters are to the nervous system, because both are the respective chemical messengers of their systems.
The correct answer is When presented auditorily rather than visually. While the left hemisphere is predominantly responsible for language processing, the question asks about the most efficient presentation method for verbal stimuli in individuals with an intact corpus callosum. Auditory processing of verbal information often allows for more direct and rapid access to language centers compared to visual presentation. When verbal stimuli are presented visually, they must first be processed by the visual cortex, then interpreted as linguistic symbols, and finally sent to language areas. Auditory stimuli, however, directly engage the auditory cortex and subsequent language-specific regions, often leading to quicker and more accurate identification. Options A and B are incorrect because the left hemisphere is specialized for language, making direct input to it (e.g., from the right visual field) more efficient than initial processing by the right hemisphere. Option C, presenting to the left visual field, would send information to the right hemisphere first, requiring interhemispheric transfer, thus being less efficient for verbal identification.
Correct Answer: Roger Sperry
Roger W. Sperry received the 1981 Nobel Prize in Physiology or Medicine for his pioneering research on split-brain patients. His work demonstrated that the left and right hemispheres of the brain have specialized functions and can operate independently when the corpus callosum is severed.
Why the other options are incorrect:
The thalamus functions primarily as a relay system, processing and directing sensory information to the appropriate areas of the cerebral cortex. The other options describe different roles or characteristics not central to the thalamus's main function.
The hindbrain is correctly identified as consisting of the cerebellum, medulla, and pons, which are vital for basic life functions and motor control. The other options describe different brain systems or functions, not the complete hindbrain structure.
The sympathetic division of the autonomic nervous system activates the "fight or flight" response, causing symptoms like a pounding heart and shaking hands. The parasympathetic division calms the body, and the somatic division controls voluntary actions, making other options wrong.
Alterations in dopamine activity, particularly excessive levels, are strongly implicated in the development of schizophrenia. While dopamine is involved in other functions, schizophrenia is the primary disorder linked to these specific synaptic changes.
Neurons convey information about stimulus strength by varying the rate at which they fire action potentials. Individual action potentials are all-or-none events, meaning their size and speed remain constant, unlike their frequency.
An action potential is the brief electrical charge that travels down an axon, occurring when the neuron's charge becomes less negative or positive. A resting potential is the inactive state, not the impulse initiation.