MIT neuroscientists at the Picower Institute have identified organizational rules governing how neurons in the primary visual cortex process visual information. By imaging individual dendritic spines and cell bodies in mice as they viewed moving gratings, the team found that synaptic inputs are not randomly arranged. Key findings include: spine-soma correlation increases with proximity to the soma, visually responsive spines cluster within 5-micron enclaves, apical dendrites on responsive neurons have more visually responsive spines than those on non-responsive neurons, and orientation selectivity is the single most important factor predicting how well a spine's response correlates with the cell body. These rules provide a baseline for studying genetic mutations affecting visual circuits and could inform computational models of neural integration.
Sort: