A recent scientific study has shown that the human brain begins to prepare for sensory stimuli before they occur, as patterns of neural activity related to what a person expects to see or feel appear in it, providing a deeper understanding of how the brain prepares to process information from the surrounding environment.
Brain structure responsible for expectation
The scientific website 'Medical Xpress' reported day before yesterday that researchers from the Massachusetts Institute of Technology, Northeastern University, and Massachusetts General Hospital in the United States have concluded that a small structure in the midbrain, known as the 'superior colliculus', is involved in processing visual and tactile information and directing eye movements, and plays a role in anticipating sensory stimuli before they arrive.
Study methodology and results
The study, the results of which were published in the scientific journal 'Nature Neuroscience' on October 7, included 80 adult participants. Researchers used an advanced seven-tesla functional magnetic resonance imaging technique, which allows for high-precision monitoring of brain activity, to observe the brain's response while images were displayed to participants or pressure was applied to their thumbs to test tactile sensation.
The results showed that viewing images was associated with greater activity in the superficial layers of the superior colliculus, while tactile sensation was associated with greater activity in its deep layers. Researchers also noticed similar patterns of activity appearing before the stimuli were presented, when participants were expecting what they would see or feel.
Role of machine learning and the thalamus
To verify these results, researchers used machine learning techniques, which help identify patterns in data, and were able to distinguish between neural activity associated with vision and activity associated with touch, even before the sensory stimuli arrived. Researchers also observed similar signals in two regions of the thalamus, a deep part of the brain that contributes to transmitting and processing sensory information, indicating that preparation for expected stimuli is not limited to the cerebral cortex, but also involves deep brain structures.
These results contribute to expanding the understanding of brain mechanisms and how it deals with surrounding stimuli, while also opening the door for further research to understand the relationship between sensory expectation, information processing, and response.
Source: Syrian Arab News Agency (SANA)
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