?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Convergence-Zone+Episodic+Memory%3A+Analysis+and+Simulations&rft.creator=Moll%2C+Mark&rft.creator=Miikkulainen%2C+Risto&rft.subject=Computational+Neuroscience&rft.subject=Neural+Nets&rft.description=Human+episodic+memory+provides+a+seemingly+unlimited+storage+for+everyday+experiences%2C+and+a+retrieval+system+that+allows+us+to+access+the+experiences+with+partial+activation+of+their+components.+The+system+is+believed+to+consist+of+a+fast%2C+temporary+storage+in+the+hippocampus%2C+and+a+slow%2C+long-term+storage+within+the+neocortex.+This+paper+presents+a+neural+network+model+of+the+hippocampal+episodic+memory+inspired+by+Damasio's+idea+of+Convergence+Zones.+The+model+consists+of+a+layer+of+perceptual+feature+maps+and+a+binding+layer.+A+perceptual+feature+pattern+is+coarse+coded+in+the+binding+layer%2C+and+stored+on+the+weights+between+layers.+A+partial+activation+of+the+stored+features+activates+the+binding+pattern%2C+which+in+turn+reactivates+the+entire+stored+pattern.+For+many+configurations+of+the+model%2C+a+theoretical+lower+bound+for+the+memory+capacity+can+be+derived%2C+and+it+can+be+an+order+of+magnitude+or+higher+than+the+number+of+all+units+in+the+model%2C+and+several+orders+of+magnitude+higher+than+the+number+of+binding-layer+units.+Computational+simulations+further+indicate+that+the+average+capacity+is+an+order+of+magnitude+larger+than+the+theoretical+lower+bound%2C+and+making+the+connectivity+between+layers+sparser+causes+an+even+further+increase+in+capacity.+Simulations+also+show+that+if+more+descriptive+binding+patterns+are+used%2C+the+errors+tend+to+be+more+plausible+(patterns+are+confused+with+other+similar+patterns)%2C+with+a+slight+cost+in+capacity.+The+convergence-zone+episodic+memory+therefore+accounts+for+the+immediate+storage+and+associative+retrieval+capability+and+large+capacity+of+the+hippocampal+memory%2C+and+shows+why+the+memory+encoding+areas+can+be+much+smaller+than+the+perceptual+maps%2C+consist+of+rather+coarse+computational+units%2C+and+be+only+sparsely+connected+to+the+perceptual+maps.&rft.date=1997&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpostscript&rft.identifier=http%3A%2F%2Fcogprints.org%2F527%2F2%2Fmoll.convergence-zone.ps&rft.identifier=++Moll%2C+Mark+and+Miikkulainen%2C+Risto++(1997)+Convergence-Zone+Episodic+Memory%3A+Analysis+and+Simulations.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F527%2F