The serial reaction time task revisited: a study on motor sequence learning with an arm-reaching task.

Area of Science:

• Cognitive Neuroscience
• Motor Control
• Human Movement Science

Background:

• Visuomotor sequence learning involves acquiring element order and skilled execution.
• Previous studies using serial reaction time tasks (SRTT) primarily measured response time, conflating explicit (order) and implicit (skill) learning.
• Disambiguating explicit and implicit processes in sequence learning has been challenging due to limited measurement.

Purpose of the Study:

• To investigate the distinct components of visuomotor sequence learning using a novel arm-reaching task.
• To differentiate the learning of sequence order (declarative) from the improvement of skilled behavior (kinematic).
• To re-evaluate the interpretation of SRTT results and the role of awareness in sequence order acquisition.

Main Methods:

• Utilized a novel arm-reaching serial reaction time task (SRTT).
• Measured movement onset time (OT) for sequence order and kinematic variables like movement time (MT) for skill execution.
• Analyzed response time (RT) changes in conjunction with separate OT and MT measures.

Main Results:

• Observed response time changes consistent with key-press SRTT studies.
• Found significant differences between OT and MT, indicating concurrent learning of sequence order and skill improvement.
• Evidence suggests that learning the sequence order may not occur entirely without subject awareness.

Conclusions:

• Visuomotor sequence learning comprises distinct, measurable components: sequence order and skill execution.
• Arm-reaching SRTT provides a more nuanced understanding of sequence learning than traditional key-press tasks.
• The assumption of purely implicit sequence order learning in SRTT may need revision, as awareness appears to play a role.