?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Power+spectra+of+ongoing+activity+of+the+snail+brain+can+discriminate+odorants&rft.creator=Schutt%2C+A.&rft.creator=Basar%2C+E.&rft.creator=Bullock%2C+T.H.&rft.subject=Neurochemistry&rft.subject=Neurology&rft.subject=Neurophysiology&rft.subject=Neurophysiology&rft.description=To+test+the+hypothesis+that+different+odorants+are+likely+to+cause+distinctive+changes+in+the+ongoing+electrical+activity+of+populations+of+olfactory+cells%2C+we+investigated+field+potentials+(FP)+in+the+Helix+brain+and+their+alterations+by+odorants+as+seen+by+semimicroelectrodes+in+an+isolated+preparation+of+the+rostrum+with+ist+olfactory+organ+and+whole+central+nervous+system.+Five+pure+chemicals+and+two+natural+odorants+were+applied+as+stimulants.+Signals+recorded+both+from+the+procerebrum+(PC)+and+the+visceral+ganglion+(VG)+were+analyzed.+In+the+PC+the+five+pure+chemical+odorants+induce+stimulus-specific+characteristic+responses%2C+mainly+in+the+low+frequency+range+(%3C15+Hz).+Regardless+of+odor+intensity%2C+the+frequency+of+the+peak+power+of+sustained+induced+activity+is+constant+for+each+chemical%3A+ammonia+at+0.2+(+%3C0.02+Hz%3B+formic+acid+at+0.36+(+0.03+Hz%3B+2-pentanol+at+0.48+(+0.04+Hz%3B+2-butanol+at+0.67+(+0.03+Hz%3B+ethanol+at+1.31+(+0.09+Hz+(means+(+95%25+confidence+limits).+These+peak+power+frequencies%2C+which+we+define+as+(odor-specific+frequencies(%2C+are+confined+to+the+low+frequency+range+of+%3C+2.5+Hz.+Those+of+natural+odorants+are%3A+onion+(0.36+(+0.14+Hz)+and+apple+(1.1+(+0.25+Hz).+The+activities+evoked+in+the+PC+propagate+to+VG.+The+order+of+behavioral+aversion+determined+by+withdrawal+reactions+of+the+tentacles%2C+1%25+ammonia+%3E+formic+acid+%3E+2-pentanol+%3E+2-butanol+%3E+ethanol%2C+coincides+with+(the+order+of+molecular+affinity(+as+well+as+with+the+sequence+of+peak+power+frequencies.+There+seems+to+be+a+strong+correlation+among+behavioral+valence%2C+chemical+nature+of+an+odorant%2C+and+odor-specific+frequency.+The+finding+that%2C+in+the+Helix+olfactory+center%2C+odor+input+is+processed+as+odorant+specific+low+frequency+FP+activity+may+represent+some+general+phenomena+of+olfactory+information+processing.&rft.date=1999&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F136%2F1%2Fpower-spectra-snails.html&rft.identifier=++Schutt%2C+A.+and+Basar%2C+E.+and+Bullock%2C+T.H.++(1999)+Power+spectra+of+ongoing+activity+of+the+snail+brain+can+discriminate+odorants.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F136%2F<script src='//archive-bar.soton.ac.uk/archive-bar.js'></script>