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Simple reaction time as a function of response complexity: memory drum theory revisited
R W Christina1, M G Fischman, M J Vercruyssen
1The Pennsylvania State University, PA, USA.
Journal of Motor Behavior
|December 1, 1982
Summary
Memory drum theory predicts longer simple reaction time (SRT) for complex movements. While SRT increased with movement parts, it plateaued for 2-3 part responses, suggesting complexity limits.
Area of Science:
- Cognitive Psychology
- Human Factors Engineering
Background:
- Memory drum theory posits that reaction time increases with response complexity.
- Investigating the relationship between movement parts and simple reaction time (SRT) is crucial for understanding motor control.
Purpose of the Study:
- To test the prediction of memory drum theory regarding SRT and response complexity.
- To determine if SRT increases with the number of movement parts in a response.
Main Methods:
- Three experiments were conducted with participants (N=20, N=16, N=20) performing tasks with varying movement parts.
- Simple reaction time was measured for one-part, two-part, and three-part responses.
Main Results:
- SRT was significantly longer for one-part responses compared to two- and three-part responses.
- SRT did not differ significantly between two-part and three-part responses, suggesting a potential plateau.
- An SRT difference was observed between responses of ostensibly equal complexity, possibly due to unacknowledged movement parts.
Conclusions:
- Findings partially support memory drum theory, showing SRT increases with initial complexity.
- The lack of difference between two- and three-part responses may indicate an upper limit for SRT increase.
- Further investigation into response complexity definition is warranted.