Effects on Performance of Interpolated Tasks During the KR Delay or the Post-KR Delay Interval

Area of Science:

• Motor control
• Cognitive psychology
• Human performance

Background:

• Investigating motor information processing during intertrial intervals is key to understanding motor learning.
• Discrete motor tasks involve specific phases: no knowledge of results (NO-KR) and knowledge of results (KR).

Observation:

• Subjects performed a grasping task with and without interpolated verbal or motor tasks during KR delay intervals.
• Experiment 2 assessed the difficulty of interpolated tasks, finding verbal tasks more difficult than motor tasks.
• Performance was measured by constant error and variable error.

Findings:

• Motor interpolated tasks increased variable error, suggesting interference with motor short-term memory capacity.
• Interference during the post-KR delay interval significantly impacted performance more than during the KR delay interval.
• No significant change in constant error indicated that motor interpolated tasks primarily affect performance variability, not accuracy.

Implications:

• The timing of interpolated tasks critically influences motor learning and performance.
• Post-KR delay interval processing is more influential on motor performance than KR delay interval processing.
• Understanding these dynamics can optimize motor skill acquisition and training protocols.