Abstract

Conditional learning is an important component of our everyday activities (e.g., handling a phone or sorting work files) and requires identification of the arbitrary stimulus, accurate selection of the motor response, monitoring of the response, and storing in memory of the stimulusresponse association for future recall. Learning this type of conditional visuomotor task appears to engage the premotor dorsal region (PMd). However, the extent to which PMd might be involved in specific or all processes of conditional learning is not well understood. Using transcranial magnetic stimulation (TMS), we demonstrate the role of human PMd in specific stages of learning of a novel conditional visuomotor task that required subjects to identify object center of mass using a color cue and to apply appropriate torque on the object at lift onset to minimize tilt. TMS over PMd, but not vertex, increased error in torque exerted on the object during the learning trials. Analyses of digit position and forces further revealed that the slowing in conditional visuomotor learning resulted from impaired monitoring of the object orientation during lift, rather than stimulus identification, thus compromising the ability to accurately reduce performance error across trials. Importantly, TMS over PMd did not alter production of torque based on the recall of learned color-torque associations. We conclude that the role of PMd for conditional learning is highly sensitive to the stage of learning visuomotor associations. NEW & NOTEWORTHY Conditional learning involves stimulus identification, motor response selection, response monitoring, memory encoding, and recall of the learned association. Premotor dorsal (PMd) has been implicated for conditional learning. However, the extent to which PMd might be involved in specific or all stages of conditional learning is not well understood. The novel finding of our study is that PMd appears to be involved with monitoring motor responses, a sensorimotor integration stage essential for conditional learning.

Original languageEnglish (US)
Pages (from-to)445-456
Number of pages12
JournalJournal of Neurophysiology
Volume117
Issue number1
DOIs
StatePublished - Jan 20 2017

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Learning
Torque
Transcranial Magnetic Stimulation
Color
Association Learning
Aptitude
Cues

Keywords

  • Association
  • Cortex
  • Grasp
  • TMS

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology

Cite this

Role of human premotor dorsal region in learning a conditional visuomotor task. / Parikh, Pranav J.; Santello, Marco.

In: Journal of Neurophysiology, Vol. 117, No. 1, 20.01.2017, p. 445-456.

Research output: Contribution to journalArticle

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