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1. Cockroaches (Periplaneta americana) responded to controlled wind puffs with stereotyped turns away from the source of wind. This was followed by running in more varied directions (Fig 3, 5). 2. Control experiments indicate that the wind direction, and not other cues from the wind stimulator, provides the directional information for the turn (Fig. 7). 3.(More)
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 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)
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)
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)
We tested two alternative models of integration among the cockroach giant interneurons (GIs) for determining the directions of wind-evoked escape turns. One model, called steering wheel, pits contralateral GIs against one another; the other, called population vector model, involves a vector computation among the GIs. In testing each model theoretically, the(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. 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 respond to the approach of a predator by turning away and then running. Three bilateral pairs of giant interneurons are involved in determining the direction of the sensory stimulus and setting the turn direction. Each of these six interneurons has a different directional response to wind stimuli. We have tested whether these six cells use a(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)