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The effects of stimulus distribution form during trace conditioning
Charlotte Bonardi1, Dómhnall J Jennings2
11 School of Psychology, University of Nottingham, Nottingham, UK.
Quarterly Journal of Experimental Psychology (2006)
|August 15, 2017
Summary
Varying the trace interval duration during conditioning enhanced conditioned stimulus (CS) responding in rats. This suggests that a variable trace interval, not a fixed one, strengthens CS associative strength.
Area of Science:
- Behavioral Neuroscience
- Learning and Memory
Background:
- Trace conditioning involves a temporal gap between the conditioned stimulus (CS) and unconditioned stimulus (US).
- The distribution form of the trace interval is a critical parameter influencing conditioning effectiveness.
Purpose of the Study:
- To investigate how the distribution form of the trace interval affects trace conditioning in rats.
- To determine if observed performance differences during the CS reflect acquisition of associative strength or a performance effect.
Main Methods:
- Two experiments utilized a trace conditioning procedure with rats, comparing fixed versus variable trace interval durations.
- Experiment 3 employed a subsequent delay conditioning phase and extinction testing to differentiate performance and acquisition effects.
Main Results:
- Rats in the variable trace interval group (Group Var) exhibited higher responding during the CS compared to the fixed group (Group Fix).
- Conversely, Group Fix showed higher responding during the trace interval itself.
- Post-conditioning testing indicated that Group Var acquired greater associative strength to the CS than Group Fix.
Conclusions:
- The distribution form of the trace interval significantly impacts associative learning.
- Variable trace intervals enhance the acquisition of associative strength for the conditioned stimulus in trace conditioning paradigms.
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