Jeffrey M. Camhi

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Cockroaches (Periplaneta americana) use their antennae to detect a wall and to maintain a constant distance from it as they walk or run along it. The faster they run, the closer they position themselves to the wall. They also use their antennae to detect and follow multiple accordion-like projections in the wall. They can make up to 25 body turns s-1 for(More)
The escape behavior of the cockroachPeriplaneta americana was studied by means of high speed filming (250 frames/s) and a computer-graphical analysis of the body and leg movements. The results are as follows: 1. The behavior begins with pure rotation of the body about the posteriorly located cerci, followed by rotation plus forward translation, and finally(More)
The cockroachPeriplaneta americana responds to wind puffs by turning away, both on the ground and when flying. While on the ground, the ventral giant interneurons (ventrals) encode the wind direction and specify turn direction, whereas while flying the dorsal giant interneurons (dorsals) appear to do so. We report here on responses of these cells to(More)
1. Controlled wind puffs of different directions and velocities were delivered to the cerci of cockroaches (Periplaneta americana), while the responses of individually identifiable giant interneurons (GI's) were recorded intracellularly. 2. All fourteen histologically identified GI's (seven bilateral pairs) respond with a burst of action potentials to wind(More)
The cockroachPeriplaneta americana responds to the approach of a predator by turning away. A gentle wind gust, caused by the predator's approach, excites cereal wind receptors, which encode both the presence and the direction of the stimulus. These cells in turn excite a group of giant interneurons (GI's) whose axons convey the directional information to(More)
1. Responses to wind puffs from different directions were recorded from the whole cercal nerve ofPeriplaneta americana using a suction electrode. The directional responses of specific columns of hairs (Nicklaus, 1965) were studied by covering all other columns with a sticky substance. The nerve responses were low-pass filtered and summated over 64–256(More)
1. Adult male cockroaches (Periplaneta americana) which were fixed in place but could move their legs normally were presented with wind puffs of different amplitudes. The puffs were given while the cockroaches were walking at different speeds, standing or grooming their antennae. In different experiments we recorded either the movement responses of one(More)
Cockroaches (Periplaneta americana) respond to air displacement produced by an approaching predator by turning and running away. A set of 4 bilateral pairs of ventral giant interneurons is important in determining turn direction. Wind from a given side is known to produce more spikes, an earlier onset of the spike trains, and different fine temporal(More)
1 Cockroaches (Periplaneta americana) that were restrained but were able to make normal walking movements were stimulated with wind puffs delivered to the cereal wind receptors. Some puffs were superimposed on a constant ‘headwind’ simulating the relative wind that the walking cockroach would experience if it were not fixed in place. Puffs were either of(More)
1. In a tethered cockroach (Periplaneta americana) whose wings have been cut back to stumps, it is possible to elicit brief sequences of flight-like activity by puffing wind on the animal's body. 2. During such brief sequences, rhythmic bursts of action potentials coming from the thorax at the wingbeat frequency, descend the abdominal nerve cord to the last(More)