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Effects of habituation and classical conditioning on reflex modification
1Department of Somatic Psychology, University of Bergen, Norway.
Summary
This study explored reflex modification using skin conductance responses (SCRs). Findings suggest the orienting response (OR), not conditioned diminution, primarily influences reflex modification when a preceding stimulus occurs.
Area of Science:
- Psychology
- Neuroscience
- Human Physiology
Background:
- Reflex modification involves altering a reflex through a preceding stimulus (S1) before the main stimulus (S2).
- Investigated habituation of the orienting response (OR) and classical conditioning's role in reflex modification of skin conductance responses (SCRs).
- Previous research has not definitively established whether the OR or conditioned responses drive reflex modification.
Purpose of the Study:
- To investigate the mechanisms underlying reflex modification.
- To differentiate the effects of the orienting response (OR) versus conditioned diminution on skin conductance responses (SCRs).
- To determine if habituation of the OR or classical conditioning is the primary driver of reflex modification.
Main Methods:
- Two experiments were conducted involving distinct auditory stimuli (S1: 200 Hz, S3: 3000 Hz) and a white noise stimulus (S2).
- Experiment 1 involved pre-exposing groups to S1 or S3, followed by pairings of S1 with S2, or S2 with S1 in a control group.
- Skin conductance responses (SCRs) were measured to assess reflex modification under different pre-exposure and conditioning paradigms.
Main Results:
- Groups pre-exposed to S1 (Group S1) exhibited significantly larger SCRs in the second phase compared to groups pre-exposed to S3 (Group S3).
- The control group, receiving S2 paired with S1, also showed differences, but the comparison between Group S1 and Group S3 was key.
- Results indicate that the orienting response (OR) to the initial stimulus (S1) plays a significant role in reflex modification.
Conclusions:
- The findings support the hypothesis that the orienting response (OR) to a pre-stimulus is a primary mechanism for reflex modification.
- Conditioned diminution of the unconditioned response appears to have a lesser effect on reflex modification compared to the OR.
- Further investigation in Experiment 2 aimed to solidify the role of conditioned diminution in reflex modification.