?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Phototaxic+foraging+of+the+archaepaddler%2C+a+hypothetical+deep-sea+species&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=An+autonomous+agent+(animat%2C+hypothetical+animal)%2C+called+the+(archae)+paddler%2C+is+simulated+in+sufficient+detail+to+regard+its+simulated+aquatic+locomotion+(paddling)+as+physically+possible.++The+paddler+is+supposed+to+be+a+model+of+an+animal+that+might+exist%2C+although+it+is+perfectly+possible+to+view+it+as+a+model+of+a+robot+that+might+be+built.+The+agent+is+assumed+to+navigate+in+a+simulated+deep-sea+environment%2C+where+it+hunts+autoluminescent+prey.+It+uses+a+biologically+inspired+phototaxic+foraging-strategy%2C+while+paddling+in+a+layer+just+above+the+bottom.+The+advantage+of+this+living+space+is+that+the+navigation+problem+is+essentially+two-dimensional.+Moreover%2C+the+deep-sea+environment+is+physically+simple+(and+hence+easier+to+simulate)%3A+no+significant+currents%2C+constant+temperature%2C+completely+dark.+A+foraging+performance+metric+is+developed+that+circumvents+the+necessity+to+solve+the+travelling+salesman+problem.+A+parametric+simulation+study+then+quantifies+the+influence+of+habitat+factors%2C+such+as+the+density+of+prey%2C+and+the+body-geometry+(e.g.+placement%2C+direction+and+directional+selectivity+of+the+eyes)+on+foraging+success.+Adequate+performance+proves+to+require+a+specific+body-%25+geometry+adapted+to+the+habitat+characteristics.+In+general+performance+degrades+smoothly+for+modest+changes+of+the+geometric+and+habitat+parameters%2C+indicating+that+we+work+in+a+stable+region+of+'design+space'.+The+parameters+have+to+strike+a+compromise+between+on+the+one+hand+the+ability+to+'fixate'+an+attractive+target%2C+and+on+the+other+hand+to+'see'+as+many+targets+at+the+same+time+as+possible.+One+important+conclusion+is+that+simple+reflex-based+navigation+can+be+surprisingly+efficient.+In+the+second+place%2C+performance+in+a+global+task+(foraging)+depends+strongly+on+local+parameters+like+visual+direction-tuning%2C+position+of+the+eyes+and+paddles%2C+etc.+Behaviour+and+habitat+'mould'+the+body%2C+and+the+body-geometry+strongly+influences+performance.+The+resulting+platform+enables+further+testing+of+foraging+strategies%2C+or+vision+and+locomotion+theories+stemming+either+from+biology+or+from+robotics.%0A&rft.date=1998&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F2119%2F3%2FPub1_5.pdf&rft.identifier=++Bertin%2C+R.J.V.+and+van+de+Grind%2C+W.A.++(1998)+Phototaxic+foraging+of+the+archaepaddler%2C+a+hypothetical+deep-sea+species.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F2119%2F