Tiny brain structure anticipates what we are about to see or feel, study finds

Key Points:

• Researchers from MIT, Northeastern University, and Massachusetts General Hospital found that the superior colliculus, a small midbrain structure, not only processes incoming sensory information but also anticipates upcoming sensory events, supporting the theory of predictive processing in the brain.
• Using ultra-high-field 7-Tesla fMRI on 80 adults, the team observed that the superior colliculus exhibits layer-specific activity patterns corresponding to vision in superficial layers and touch in deeper layers, both during stimulation and in anticipation before sensory input.
• Machine learning analysis confirmed that brain activity patterns in the superior colliculus before sensory stimuli closely matched those during actual sensory experiences, indicating the structure's role in preparing for expected sensory input.
• Similar predictive signals were found in sensory nuclei of the thalamus, suggesting that anticipation of sensory events is a brain-wide function involving deeper brain structures, not just the cortex.
• The study opens new avenues for exploring the superior colliculus' contributions to sensory processing, cognitive control, emotion, and working memory, challenging previous assumptions that high-level prediction is primarily cortical and highlighting the potential of advanced neuroimaging techniques.