Differential neural encoding of sensorimotor and visual body representations

Area of Science:

• Neuroscience
• Cognitive Psychology
• Body Representation

Background:

• Sensorimotor processing influences mental body representations.
• Impaired somatosensory input shifts representation towards visual aspects, affecting mental manipulation like rotation.
• This suggests distinct sensorimotor and visual reference frames for local (e.g., hands) vs. global (e.g., full-body) representations.

Purpose of the Study:

• To investigate if specific reference frames (sensorimotor vs. visual) are reflected in distinct brain network activations.
• To compare brain activity during mental rotation of hands versus full-bodies.

Main Methods:

• Functional neuroimaging (fMRI) was used to measure brain activity.
• Participants performed mental rotation tasks involving hands and full-bodies.
• Brain activation patterns were compared between the two tasks.

Main Results:

• Mental rotation of hands strongly activated sensorimotor areas (supplementary motor area, premotor cortex, secondary somatosensory cortex).
• Mental rotation of full-bodies showed stronger activation in visual areas (temporo-occipital regions, extrastriate body area).

Conclusions:

• The body is represented using both sensorimotor and visual frames of reference.
• Two distinct neural networks likely encode local and global body representations.
• The extrastriate body area is a multimodal hub for both perceptual and representational body processing.