?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=EEG+Simulation%3A+Variation+of+Spectral+Envelope%2C+Pulse+Synchrony+and+~40+Hz+Oscillation.&rft.creator=Wright%2C+J.J.&rft.subject=Computational+Neuroscience&rft.description=A+simplified+simulation+of+cortical+neuronal+interaction+reproduces+some+features+of+the+electrocorticogram+(ECoG).+Nonspecific+activation+acts+to+control+the+transfer+function+of+the+simulated+cortex%2C+and+thus+determines+the+relative+amplitude+of+waves+generated+by+rhythmic+inputs.When+concurrent+asynchronous+excitatory+inputs+to+separate%2C+local%2C+cortical+sites+are+introduced%2C+the+simulation+reproduces+both+gamma+band+(40Hz)+ECoG+activity+and+synchronous+oscillation+of+action+potential+pulse+density+at+the+seperate+sites.+The+gamma+band+ECoG+and+pulse+synchrony+effects+depend+on+different+mechanisms+-+the+former+upon+local+excitatory%2Finhibitory+interactions%2C+and+the+latter+on+cortico-cortical+interactions.+The+pattern+of+synchronous+activity+depends+upon+both+structural+and+dynamic+aspects+of+gain.+Dynamic+properties+which+are+independent+of+scale+in+the+simulation%2C+describe+intercellular%2C+intercolumnar+or+interareal+phenomena%2C+all+in+accord+with+physiological+findings+(Singer+and+Gray+1995).&rft.date=1997-04&rft.type=Preprint&rft.type=PeerReviewed&rft.format=application%2Fpostscript&rft.identifier=http%3A%2F%2Fcogprints.org%2F16%2F2%2Fpaper1.ps&rft.identifier=++Wright%2C+J.J.++(1997)+EEG+Simulation%3A+Variation+of+Spectral+Envelope%2C+Pulse+Synchrony+and+~40+Hz+Oscillation.++%5BPreprint%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F16%2F