Memory and perceptual trace development in ballistic timing

Area of Science:

• Motor Learning
• Cognitive Psychology
• Human Performance

Background:

• Adams' (1971) closed-loop theory posits that motor skill acquisition depends on practice with knowledge of results (KR).
• The theory suggests performance degrades if KR is removed before memory and perceptual traces are sufficiently developed.
• Conversely, substantial practice allows for sustained performance even without KR.

Purpose of the Study:

• To empirically test the prediction that early withdrawal of knowledge of results (KR) negatively impacts motor performance.
• To investigate the relationship between the amount of KR practice and the strength of memory and perceptual traces.

Main Methods:

• Three independent groups performed a motor task (24.13-cm movement in 150 msec) with varying amounts of KR trials.
• Knowledge of results (KR) was withdrawn early in the practice for all groups.
• Performance was assessed using mean absolute error and mean absolute estimated error to reflect memory and perceptual trace capabilities.

Main Results:

• The amount of KR practice directly influenced the development of memory and perceptual traces.
• Performance degradation was observed when KR was withdrawn early, confirming the first prediction of closed-loop theory.
• Despite early KR withdrawal, memory and perceptual traces remained relatively robust after sufficient practice.

Conclusions:

• The findings support Adams' (1971) closed-loop theory regarding the role of KR in motor learning.
• Adequate practice with KR is essential for establishing stable memory and perceptual traces.
• Motor performance can be maintained in the absence of KR, provided sufficient prior practice has occurred.