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Second-order conditioning and Pavlovian conditioned inhibition: operational similarities and differences
H Yin1, R C Barnet, R R Miller
1Department of Psychology, State University of New York--Binghamton 13902-6000.
Journal of Experimental Psychology. Animal Behavior Processes
|October 1, 1994
Summary
The number of CS2-CS1 pairings critically determines whether second-order excitation or Pavlovian inhibition is established. Few pairings lead to excitation, while many pairings result in inhibition in rats.
Area of Science:
- Behavioral neuroscience
- Animal learning and behavior
Background:
- Second-order excitation and Pavlovian inhibition share similar procedural elements.
- Distinguishing between these two learning phenomena requires identifying critical operational differences.
Purpose of the Study:
- To identify the key procedural differences that lead to second-order excitation versus Pavlovian inhibition.
- To investigate the role of the number of CS2-CS1 trials in differentiating these learning outcomes.
Main Methods:
- Conditioned suppression in rats was employed to assess learning.
- Varying numbers of CS2-CS1 trials (none, few, many) were presented either interspersed with or sequentially after CS1-US trials.
Main Results:
- Second-order excitation was observed with few CS2-CS1 pairings, regardless of trial arrangement (interspersed or sequential).
- Pavlovian inhibition was evident on summation and retardation tests only after many CS2-CS1 pairings, provided CS1 remained excitatory.
Conclusions:
- The number of CS2-CS1 pairings is the critical factor differentiating second-order excitation from Pavlovian inhibition.
- This finding offers a clear operational distinction for establishing these two forms of associative learning.