Lecture 3-Outline

Lecture 3-Outline - Experimental Psychology Learning...

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Lecture 3 Outline A. Examples revisited- visual attention in infants, salivation in adults, startle response in rats B. Why Habituate or Sensitize? III. Habituation/ Sensitization Our examples of habituation and sensitization were “performance” not a “mechanism of behavior” What is the FORMAL CAUSE of these changes in behavior? That theory is the dual process theory. 1. Must occur in the CNS 2. Not motor fatigue or sensory adaptation B. Stimulus-specific C. Response-specific IV. Dual Process Theory (Groves and Thompson, 1970) Two distinct neural processes: Habituation process Sensitization process These processes are active simultaneously The behavioral outcome (performance) depends upon the strength of each process. Changes in responding are the net of the habituation and sensitization process. Graph : Habituation (NET) observed when Habituation (H) > Sensitization (S). Sensitization (NET) observed when sensitization (S)> Habituation (H). Wherever the NET line is, is what we observe behaviorally (habituation or sensitization). Dual Process Theory is based on physiological data from the CNS Stimulus Response (S-R system): Habituation occurs in the reflex arc. -Specific response- like sweat from hot food not sour food generally -Short neural loop -Each stimulus presentation activates the loop -Sensory-----CNS-----Muscle State System : Sensitization occurs in CNS areas that determine activation. -Generalized response -Only activated during arousing events -Psychoactive compounds can affect the state system- like drinking coffee etc. A. Mechanism of Behavior
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This note was uploaded on 02/21/2010 for the course PSYC 356 taught by Professor Bishop during the Spring '08 term at Binghamton.

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Lecture 3-Outline - Experimental Psychology Learning...

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