Response programming in simple and choice reactions.

Area of Science:

• Cognitive psychology
• Human motor control
• Reaction time studies

Background:

• Reaction time is a key measure in understanding cognitive processes.
• Previous research often used simple reaction time (SRT) tasks, potentially limiting understanding of complex responses.
• The distinction between simple and choice reaction time (CRT) is crucial for interpreting motor control data.

Purpose of the Study:

• To investigate how modifying motor response characteristics affects simple reaction time (SRT) versus choice reaction time (CRT).
• To determine if the reliable effects observed in CRT are also present in SRT under controlled conditions.
• To re-evaluate existing theories, such as the Henry and Rogers memory drum theory, in light of SRT and CRT differences.

Main Methods:

• Participants performed both simple and choice reaction time tasks.
• Motor response parameters were systematically altered.
• Instructions and practice were employed to control for strategic adjustments.
• Analysis focused on the reliability and magnitude of changes in SRT and CRT.

Main Results:

• Changes in motor response nature reliably altered CRT.
• The same changes had unreliable effects on SRT, often disappearing with practice and specific instructions.
• This suggests a response programming component in CRT that can be bypassed in SRT.

Conclusions:

• The reliable effects of motor response changes are specific to choice reaction time tasks.
• Simple reaction time tasks may not fully capture the response programming component.
• The Henry and Rogers memory drum theory is more applicable to choice reactions than simple reactions as demonstrated in this study.