Motor imagery in mental rotation: an fMRI study

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Mental rotation is a key cognitive function involving spatial reasoning.
• Previous studies identified superior parietal lobule and extrastriate cortex activation during mental rotation.
• The role of premotor areas in mental rotation remains less understood.

Purpose of the Study:

• To investigate neural differences in mental rotation of hands versus tools.
• To explore the influence of stimulus type on brain activation during mental rotation.
• To examine the role of motor imagery in mental rotation tasks.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to monitor brain activity in twelve right-handed men.
• Participants performed mental rotation and control tasks involving visual stimuli of hands and tools.
• Reaction times and brain imaging data were collected and analyzed.

Main Results:

• fMRI data replicated known activation in bilateral superior parietal lobule and visual extrastriate cortex for both hands and tools.
• A significant difference was observed in premotor cortex activation: bilateral activation for hands, left-lateralized for tools.
• Reaction time patterns were consistent with prior mental rotation research.

Conclusions:

• The findings suggest that motor imagery during mental rotation is stimulus-dependent.
• Bilateral premotor activation for hands may reflect imagining bimanual movement.
• Left premotor activation for tools may involve imagining manipulation with the dominant hand.
• Cortical activation during mental rotation is influenced by the 'afforded actions' of the stimuli.