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Stimulus omission and the orienting response: latency differences suggest different mechanisms.

R J Barry¹, J G O'Gorman

¹School of Education, University of New South Wales, Kensington, Australia.

Biological Psychology

|December 1, 1987

Summary

The orienting response (OR) to a missing stimulus has a longer latency than to a present stimulus. This suggests the missing-stimulus OR may be voluntary, not reflexive.

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Area of Science:

Psychology
Neuroscience
Cognitive Science

Background:

The missing-stimulus effect, where omitting a predictable stimulus elicits a response, is key to Orienting Response (OR) theory.
Previous research on this effect yielded inconsistent results, possibly due to a mix of voluntary and involuntary ORs.
Barry (1984b) proposed that voluntary ORs (Maltzman, 1979) might explain the variability in responses to omitted stimuli.

Purpose of the Study:

To test the hypothesis that the OR to stimulus omission has a longer latency than the OR to physical stimuli.
To investigate whether the missing-stimulus effect is primarily a voluntary OR.
To explore implications for understanding ORs to stimulus change.

Main Methods:

Two experiments were conducted using electrodermal responses to assess reaction times.

Related Experiment Videos

Experiment 1: Measured responses to simple visual stimuli and their omission.

Experiment 2: Replicated findings with both significant and indifferent visual stimuli.

Main Results:

A significant latency delay was observed for electrodermal responses to stimulus omission compared to physical stimuli.
Latency differences ranged from 1.15 to 1.65 seconds.
The results were consistent across both experiments and stimulus types.

Conclusions:

The longer latency of the orienting response to stimulus omission supports the view that it involves an intervening cognitive process, characteristic of a voluntary OR.
These findings suggest that stimulus omission may elicit a voluntary OR, distinct from the reflexive OR to physical stimuli.
The study contributes to a refined conceptualization of orienting responses to various forms of stimulus change.