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Hemispheric asymmetries in visual mental imagery.

Jianghao Liu1,2, Alfredo Spagna3, Paolo Bartolomeo4,5

  • 1Sorbonne Université, Inserm U 1127, CNRS UMR 7225, Paris Brain Institute, ICM, Hôpital de La Pitié-Salpêtrière, 75013, Paris, France.

Brain Structure & Function
|April 22, 2021
PubMed
Summary

Visual mental imagery involves brain networks, not just early sensory areas. Left temporal lobe is key for internally generated images, while right temporal lobe is involved in externally triggered visual imagery.

Keywords:
Brain damageCortical stimulationFrontoparietal networksMental imageryNeuroimagingTemporal lobe

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Visual mental imagery allows visualization of absent objects.
  • Left temporal lobe lesions historically linked to impaired imagery.
  • Previous research lacked cross-methodological synthesis of hemispheric asymmetry in imagery.

Purpose of the Study:

  • To review literature on hemispheric laterality of visual mental imagery.
  • To integrate findings from lesion neuropsychology, neuroimaging, and direct cortical stimulation.
  • To identify cross-method patterns in brain network involvement.

Main Methods:

  • Critical literature review.
  • Analysis of studies using lesion neuropsychology.
  • Examination of neuroimaging and direct cortical stimulation data.

Main Results:

  • Frontoparietal networks in both hemispheres support visual mental imagery.
  • Left inferior temporal lobe is crucial for endogenous imagery, especially with text.
  • Right temporal lobe stimulation predominantly elicits imagery for exogenous visual stimuli.

Conclusions:

  • Hemispheric asymmetry in visual mental imagery is evident across methods.
  • Findings challenge models focused solely on early sensory cortices.
  • Visual mental imagery relies on large-scale networks involving temporal lobe regions.