LINK === https://cinurl.com/2sMHFY
rapid visual-spatial sequence integration is the first and one of the most importantgating processes in the brain. a novel theory of corticalstructure, which explains this integration and the role of occulusionis presented. this theory combines both a biomechanical and a neuro-corticalframework. in the biomechanical framework, occlusion is proposed tobe the result of two distinct processes operating in parallel. the firstprocess refers to the inactivation of the lgn cells due to the deathof their primary afferents. the second process refers to an interactionbetween v1 cells and mst cells that strengthens the connectionsbetween them, thereby increasing the likelihood of forming a connection.in the neuro-cortical framework, occlusion arises from a simple topologicalprocess of v1 pooling. v1 cells form net-like and temporally evolving assemblies that are coordinated by the mst cells. the occlusion of v1activations is interpreted as the effective dead-zone of activations in thewhole v1. this dead-zone is the result of the causal structure. in general, when av1 cell is active, it contributes to the strengthening of the connectionwith another v1 cell at this moment. this strengthening process weakens theconnections with any cell in the same assembly that is not simultaneouslyactive. in this way, the assembly of v1 cells virtually primes itself to reactivatethe next occlusion even if this is not bound to the actual activation of av1 cell. if the assembly does not reactivate then it is excluded from becomingactive. the effect of multiple occlusions is to maintain a stable pattern ofactivated assemblies. when two assemblies compete for dominance in the assemblygraph, the one that is active for a longer period is the winner. this phenomenonproduces the progressive building of temporal sequences of assembly activations.the occlusion of v1 cells is here interpreted as an emergent effect of the highmotor excitability of v1 cells that rapidly transiently activate any cellsin their vicinity without a long-lasting plastic change. the removal of thelgn input deactivates the cells and eliminates the occlusion. in animals, thetransient deactivation of most v1 cells leads to the extinction of theassembly. the assembly becomes extinct as a result of the competitionbetween the assemblies for dominance. but the removal of occlusion leavesthe assemblies to exhibit further evolutionary changes.
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https://open.firstory.me/story/cldne7f5l0czz01t4c72z5hxl https://open.firstory.me/story/cldne6hgz0czv01t44lcdf2qv https://open.firstory.me/story/cldne6hgz0czv01t44lcdf2qv https://open.firstory.me/story/cldne7f5l0czz01t4c72z5hxl https://open.firstory.me/story/cldne7f5l0czz01t4c72z5hxl