?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+influence+of+light%2Fdark+adaptation+and+lateral+inhibition+on+phototaxic+foraging.+A+hypothetical-animal+study.&rft.creator=Bertin%2C+R.J.V.&rft.creator=van+de+Grind%2C+W.A.&rft.subject=Theoretical+Biology&rft.subject=Neural+Modelling&rft.description=Vision+did+not+arise+and+evolve+to+just+%22see%22+things%2C+but+rather+to+act+on+and+interact+with+the+habitat.+Thus+it+might+be+misleading+to+study+vision+without+its+natural+coupling+to+vital+action.++Here+we+investigate+this+problem+in+a+simulation+study+of+the+simplest+kind+of+visually-guided+foraging+by+a+species+of+2D+hypothetical+animal+called+the+(diurnal)+paddler.+In+a+previous+study%2C+we+developed+a+hypothetical+animal+called+the+archaepaddler%2C+which+used+positive+phototaxis+to+forage+for+autoluminescent+prey+in+a+totally+dark+environment+(the+deep-sea).+Here+we+discuss+possible+visual+mechanisms+that+allow+(diurnal)+paddlers+to+live+in+shallower+water%2C+foraging+for+light-reflecting+prey+in+ambient+light.++The+modification+consists+of+two+stages.+In+the+first+stage+Weber+adaptation+compresses+the+retinal+illumination+into+an+acceptable+range+of+neural+firing+frequencies.+In+the+second+stage+highpass+filtering+with+lateral+inhibition+separates+background+responses+from+foreground+responses.+We+report+on+a+number+of+parameter-studies+conducted+with+the+foraging+diurnal+paddler%2C+in+which+the+influence+of+dark%2Flight+adaptation+and+lateral+inhibition+on+foreground%2Fbackground+segregation+and+foraging+performance+(%22fitness%22)+are+quantified.+It+is+shown+that+the+paddler+can+survive+adequately+for+a+substantial+range+of+parameters+that+compromises+between+discarding+as+much+unwanted+visual+(background)+information+as+possible%2C+whilst+retaining+as+much+information+on+potential+prey+as+possible.+Parameter+values+that+optimise+purely+visual+performance+like+foreground%2Fbackground+segregation+are+not+always+optimal+for+foraging+performance+and+vice+versa.+This+shows+that+studies+of+vision+might+indeed+require+more+serious+consideration+of+the+goals+of+vision+and+the+ethogram+of+the+studied+organisms+than+has+been+customary.%0A&rft.date=1997&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F2118%2F3%2FPub2_3.pdf&rft.identifier=++Bertin%2C+R.J.V.+and+van+de+Grind%2C+W.A.++(1997)+The+influence+of+light%2Fdark+adaptation+and+lateral+inhibition+on+phototaxic+foraging.+A+hypothetical-animal+study.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F2118%2F