Motor area activity during mental rotation studied by time-resolved single-trial fMRI

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Motor Control

Background:

• Understanding the neural basis of mental imagery is crucial in neuroscience.
• The functional equivalence between overt movements and dynamic imagery remains a key area of investigation.
• Neocortical motor areas' role in cognitive tasks like mental rotation requires further elucidation.

Purpose of the Study:

• To investigate the participation of neocortical motor areas in the mental rotation task.
• To explore the neural mechanisms underlying dynamic imagery using time-resolved fMRI.
• To determine if motor areas are involved in the cognitive act of mental rotation.

Main Methods:

• Time-resolved single-trial functional Magnetic Resonance Imaging (fMRI) was employed.
• Subjects performed Shepard and Metzler's mental rotation task with novel object pairs.
• Activation peak timing and width were analyzed in relation to response times.

Main Results:

• Bilateral involvement of the superior parietal lobule, lateral premotor area, and supplementary motor area was observed in all subjects.
• These motor areas demonstrated participation in the core process of mental rotation.
• Activation in the left primary motor cortex correlated with the right-hand button press response.

Conclusions:

• Neocortical motor areas, including the superior parietal lobule and premotor cortex, are integral to dynamic mental imagery.
• The findings support the functional equivalence of overt movements and mental imagery.
• Specific motor cortex activation is linked to response execution rather than the imagery itself.