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Changes in cortical activity during mental rotation. A mapping study using functional MRI

M S Cohen1, S M Kosslyn, H C Breiter

  • 1Brain Mapping Division, UCLA School of Medicine, Los Angeles, California, USA.

Brain : a Journal of Neurology
|February 1, 1996
PubMed
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Mental rotation, a key problem-solving skill, engages brain areas for spatial relations and object tracking. This functional MRI study reveals neural networks supporting mental imagery, similar to direct perception.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Mapping

Background:

  • Mental imagery, particularly mental rotation of complex objects, is a fundamental cognitive process.
  • The neural underpinnings of mental rotation have been extensively studied using various neuroimaging techniques.
  • Understanding these processes is crucial for cognitive psychology and neuroscience.

Purpose of the Study:

  • To investigate the neural correlates of the mental rotation task using functional magnetic resonance imaging (fMRI).
  • To identify specific brain regions activated during mental rotation compared to a control task.
  • To explore the relationship between mental imagery and direct perception in terms of neural engagement.

Main Methods:

  • Functional MRI (fMRI) was employed to measure brain activity in 10 healthy volunteers.

Related Experiment Videos

  • Participants performed a mental rotation task involving 3D shapes and a control 'comparison' task.
  • Brain activation patterns were analyzed and localized using Brodmann's areas (BAs) based on the Talairach atlas.

    • Main Results:

    • Consistent activation foci were observed in BAs 7a and 7b during mental rotation.
    • Significant activation was noted in the middle frontal gyrus (BA 8) in 88% of subjects.
    • Extrastriate cortex, including BAs 39 and 19 (putative human MT/V5), showed activation in 75% of subjects.

    Conclusions:

    • Mental rotation engages cortical areas involved in spatial relation encoding and tracking moving objects.
    • The findings support the hypothesis that mental imagery utilizes neural mechanisms similar to direct perception.
    • The study highlights the role of parietal and extrastriate visual cortex in complex spatial cognition.