Abstract
The antenna of an insect functions as an active tactile sensor. The tactile behavior of antennae was examined in blinded American cockroaches. When the cockroaches searching in an open space touched a stationary object with their antennae, they frequently approached the object more closely. Similar behavior was observed in tethered cockroaches. In these cases, a single antenna was sufficient to distinguish the angular position of an object in the horizontal plane. The scapal hair plate appears to play an important role in the detection of the horizontal position of objects since shaving off the hair plates impaired the performance of tactile orientation.
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