PSY303 exam 1 notes

PSY303 exam 1 notes - S1introduction & S2/3evolution of...

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Cognition begins with action —movement, response to a stimulus o Action begins with the ability to respond to the world Simplest responses— reflexes —a response to a stimulus Reflexes also called unconditioned responses (UCR) Stimulus of reflex also called unconditioned stimulus (UCS) o Infant swim reflexes —gone after maturity whether if stimulus stops or continues o A reflex may disappear shortly after birth o Not all reflexes are simple motor movements Long-term habituation : o Repeated stimulation of reflex causes strength and probability of response to DECREASE— habituation —cause by WEAK stimulus # of pre-synaptic terminals decreased % of active pre-synaptic terminals decreased Long-term sensitization : o Stimulation of reflex causes strength and probability of response to INCREASE— sensitization —cause STRONG stimulus # of pre-synaptic terminals increased % of active pre-synaptic terminals increased New post-synaptic receptors available —result of distributed stimulation—more effect due to: o Stronger signals of stimulus o Length of time o Repeated stimulus Classical conditioning —modulation of reflexes: o Nonvoluntary action o Unconditioned stimulus (UCS) elicits an unconditioned response (UCR) o If conditioned stimulus (CS) establishes contingent relationship with unconditioned stimulus (UCS) = conditioned response (CR) o Two kinds of classical conditioning —depends on contingency between CS and UCS : Delay conditioning —UCS occurs during presentation of CS—NO DELAY CS-UCS overlap—occur at SAME time Fast learning and high response rate; very effective; requires less trials Requires cerebellum and other sub-cortical structures Trace conditioning —UCS occurs before presentation of CS—DELAY Tone 1 st , stimulus 2 nd —occur DIFFERENT time Slower learning and lower asymptotic response rate; not effective; requires more trials Requires hippocampus
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o Groves-Thompson model —contingency between CS and UCS: Yes contingency: CS not occurred previously o Not habituated o Generates alerting signal = learning No contingency:
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This note was uploaded on 11/02/2011 for the course PSYCHLOGY 303 taught by Professor Musolino during the Spring '11 term at Rutgers.

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PSY303 exam 1 notes - S1introduction & S2/3evolution of...

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