..., anatomical acuity was estimated to be approximately 3 cycles per degree (cpd) in both sexes. However, a behavioural optomotor assay found significantly lower mean acuity in males (0.8 cpd) than females (3.0 cpd), which was not explained by differences in eye size between males and females. An additional...

... and have at least two spectral classes of photoreceptors (λ max =500 and 519 nm). From the results of optomotor behavioral experiments, we estimate the eyes of A. heterochaelis provide spatial vision with an angular resolution of ∼8 deg. We conclude that snapping shrimp have competent visual systems...

... of pattern contrasts. The optomotor response decreased as a function of decreasing luminance, and the lower limit of the moth's contrast sensitivity was found to be between 1 and 5%. The preferred spatial frequency for M. sexta increased from 0.06 to 0.3 cycles deg −1 as the luminance decreased...

... that an optomotor response at this frequency can still be possible. Fig. 4. Examples of light-on responses and graded responses to light modulation during rotation (30–60 s) in one photoreceptor cell. Stimulus frequency is indicated above each 500 lx (A) and 5 lx (B) recording. (A) Light-on responses adapt...

... if the odour source is situated close to it. We implement a model of visuomotor control consisting of three parallel subsystems: an optomotor response stabilising the model fly's yaw orientation; a collision avoidance system to saccade away from looming obstacles; and a speed regulation system. This model...

..., G. and Götz, K. G. ( 1996 ). Optomotor control of course and altitude in Drosophila melanogaster is correlated with distinct activities of at least three pairs of flight steering muscles. J. Exp. Biol. 199 , 1711 -1726. Ito, K., Suzuki, K., Estes, P., Ramaswami, M., Yamamoto, D...

... powerful avoidance responses to visual expansion centered laterally. The amplitude of these expansion responses is three times larger than those generated by image rotation. Avoidance of a laterally positioned focus of expansion emerges from an inversion of the optomotor response when motion is restricted...

... ). Osmotropotaxis in Drosophila melanogaster. J. Comp. Physiol. A 147 , 479 -484. Carlson, J. ( 2001 ). Viewing odors in the mushroom body of the fly. Trends Neurosci. 24 , 497 -498. David, C. T. ( 1979 ). Optomotor control of speed and height by free-flying Drosophila. J. Exp. Biol. 82 , 389...

... course of abdominal motion during flight ( Fig. 7 ), suggesting that stretch receptor feedback is not distributed to all motoneurons involved in optomotor responses during flight. Bilateral ablation of the hindwing stretch receptors had no significant effect on the frequency or phase of activation...

...F. Claire Rind ABSTRACT Completely unrestrained moths show an optomotor turning response to horizontal movement during pre-flight warm up or flight. As the moth warms up there is a sequential recruitment of first neck, then abdominal, leg and finally some wing muscles, into the optomotor turning...