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A response-discrimination account of the Simon effect
1Department of Psychology, Bielefeld University, Bielefeld, Germany. ulrich.ansorge@uni-bielefeld.de
Summary
The Simon effect, a cognitive bias, occurs when stimulus location influences response selection. This study shows the Simon effect is linked to how spatial cues help differentiate responses, not just stimulus location alone.
Area of Science:
- Cognitive Psychology
- Human-Computer Interaction
- Neuroscience
Background:
- The Simon effect is a well-documented phenomenon in cognitive psychology.
- It is often attributed to stimulus-triggered response activation.
- The response-discrimination hypothesis offers an alternative explanation, emphasizing the role of response selection processes.
Purpose of the Study:
- To investigate the conditions under which stimulus-triggered response activation contributes to the Simon effect.
- To test the response-discrimination hypothesis by manipulating the spatial coding of responses.
- To determine if the Simon effect is contingent on the task demands and response selection strategies.
Main Methods:
- Five experiments were conducted using variations of spatial choice-reaction and go/no-go tasks.
- Stimulus locations and response-associated spatial codes were manipulated across experiments.
- The presence and magnitude of the Simon effect were measured under different task conditions.
Main Results:
- Simon effects were observed only when stimulus locations corresponded to the spatial codes used to discriminate between responses.
- When both horizontal and vertical spatial axes discriminated responses, Simon effects occurred on both.
- Simon effects were present in choice-reaction tasks but absent in go/no-go tasks, unless specific response-discrimination conditions were met.
Conclusions:
- The findings support the response-discrimination hypothesis, indicating that stimulus-triggered response activation contributes to the Simon effect only when spatial cues are relevant for response selection.
- Task design and response-mapping strategies significantly influence the manifestation of the Simon effect.
- This research clarifies the cognitive mechanisms underlying the Simon effect, highlighting the interplay between stimulus processing and response selection.