Greg Detre
6/2/02
Prof. Rolls
Fuster � monkey STM, neurons keep firing during delay intervals while in memory (Goldman + Rakic) remembering where to move eyes (dorsolateral prefrontal???)
Rolls proposed separate AAs for regions of eye movements to remember � regional or directional???
prefrontal STM model
IT AA offloads into PF AA when it needs to compare memory against new samples � all setup with associative learning and probabilistic diluted connectivity
replicates Miller�s neurophysiology data
covert visual search � looking for an object in a complex scene without moving your eyes � spotlight of attention
back projections down the dorsal stream biases bits of V1 + V2 which project up the ventral stream � attention
OR you can do it the other way round, i.e. spatial search with object cue
this works without requiring that IT be topologically-mapped
symmetrical forward/back projections
argues that there�s nothing serial about �serial� processing � it�s just that the constraints are more difficult to meet in the parallel dynamical system, linearly increases with the number of distractors
spiking nets give you actual timescale predictions
ch 10 of NN + BF � architecture of cerebral cortex
how do the AAs form special new attractors immediately???
mean field theory
how do you get position-invariant from V1, and preserve that information (symmetry)
biased competition