Explicit and Implicit Processes Constitute the Fast and Slow Processes of Sensorimotor Learning.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Motor Control

Background:

• The canonical model of human sensorimotor learning posits parallel fast and slow processes.
• Recent research suggests sensorimotor learning comprises distinct explicit and implicit processes.
• The relationship between these two theoretical frameworks remains to be fully elucidated.

Purpose of the Study:

• To investigate the homology between the fast/slow process model and explicit/implicit learning accounts.
• To determine if the fast process corresponds to explicit learning and the slow process to implicit learning.
• To explore potential subdivisions within the slow/implicit learning process.

Main Methods:

• Utilized a novel method for directly measuring explicit and implicit learning within a sensorimotor task.
• Employed computational modeling analysis to interpret learning data.
• Assessed distinct manifestations of motor memory within the slow/implicit learning component.

Main Results:

• The fast learning process was found to closely resemble explicit learning.
• The slow learning process was shown to approximate implicit learning.
• Evidence emerged for a further subdivision of the slow/implicit process into distinct motor memory types.

Conclusions:

• The two-state model of motor learning serves as a reasonable approximation but does not fully capture the complexity of implicit learning.
• The findings highlight the need to consider multiple psychological mechanisms and neural substrates for motor learning.
• Further research is warranted to understand the diverse processes underlying motor learning curves.