Attention warps visual-semantic representations across the human cerebellum

Human attention can be effortlessly redirected between objects and events within their surroundings. This modulation of focus affects the representation of information in several cortical regions, including those responsible for visual-semantic processing. Recent findings suggest that the cerebellum, in addition to representing semantic data, may also be influenced by attentional shifts.

To investigate this, researchers utilized functional magnetic resonance imaging (fMRI) to examine brain activity in participants while they watched naturalistic movie clips and were asked to concentrate on either people or vehicles. By employing a voxelwise encoding model, the scientists were able to identify visual-semantic representations in both the cerebral cortex and the cerebellum, comparing these representations across the two conditions and measuring the shifts in visual-semantic tuning.

The research found that attention to different semantic categories significantly impacted visual-semantic tuning in the cerebellum. In some brain regions, the representations aligned with the attended category, while in others, they moved away from it. The most noticeable tuning shifts occurred in the Crus I and II regions, as well as in lobule VI of the cerebellum.

Moreover, the magnitude of attentional tuning shifts was greater in the cerebellum compared to the cerebral cortex, especially for representations that favored the attended category. These findings imply that attentional modulation in the cerebellum operates differently from that in the cerebral cortex, and may not be solely influenced by inputs from the cortex.