Lecture 2 - Elicited Behavior

Lecture 2 - Elicited Behavior - Elicited Behavior,...

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Unformatted text preview: Elicited Behavior, Habituation & Sensitization I. Elicited Behavior Behavior that occurs in reaction to specific environmental stimuli Examples ­ ? A. Reflex ­ Sensory Neuron Interneuron Motor Neuron ? ? Brain Cont. A. ­ ­ Modal Action Pattern – response sequence specific to a particular species Sexual behavior, territorial defense, aggression, etc. Requires eliciting stimulus – releasing (sign) stimulus Cont. A. B. Appetitive behavior – early components of a behavior sequence – bring an organism into contact with a stimulus, i.e. searching, foraging Consummatory behavior – end components – consummation or completion – chewing, copulating, hitting Cont. Appetitive Beginning of seq. Less stereotyped Lots of variability Altered by learning Consummatory End of seq. More stereotyped MAP(species­typical) Not as prone to alteration Cont. Examples: 1. You are thirsty Appetitive Consummatory Effects of learning? 1. You are hungry Appetitive Consummatory Effects of learning? II. Repeated Stimulation A. ­ Habituation – decrease in responding to repeated presentation of the same stimulus Different from . . . 1. Sensory adaptation – decrease in sensitivity of sense organs 2. Muscle fatigue Cont. Sensitization – increase in responding to repeated presentation ­ these help to organize behavior A. Hab. and sens. are due to changes in the nervous system. Transmission between sensory and motor neurons is either hindered or facilitated. Cont. A. Duel­Process Theory ­ dif types of neural processes are responsible for hab and sens ­ these are not mutually exclusive, there is an additive effect Cont. A. Characteristics of hab and sens 1. Time course ­ sens is generally temporary ­ hab (short vs. long­term) – will disappear eventually once stimulus is removed Cont. 1. 1. Stimulus specificity a. hab – specific to repeated stimulus b. sens – not stimulus­specific (think about pain) ­ generalizes Effects of strong extraneous stimulus a. dishabituation Cont. In the context of drug use, what do we call habituation? Tolerance III. Opponent­Process Theory Homeostatic theory of emotional behavior Based on neurophysiological mechanisms Role in mood disorders? Primary process (a) is balanced by opponent process (b) Cont. B process lags behind and is not always as strong as A process Two processes are added together to form visible emotional state When stimulus causing A process is removed, net result is that B process is driving entire emotional response (aftereffect) ...
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