scholarly journals Visual position stabilization in the hummingbird hawk moth, Macroglossum stellatarum L. II. Electrophysiological analysis of neurons sensitive to wide-field image motion

1998 ◽  
Vol 182 (2) ◽  
pp. 239-249 ◽  
Author(s):  
R. Kern
Keyword(s):  
Image Motion ◽  
Wide Field ◽  
Hawk Moth ◽  
Electrophysiological Analysis ◽  
Macroglossum Stellatarum

Image motion analyses of a wide field telescope

2012 ◽  
Vol 60 (5) ◽  
pp. 759-765 ◽  
Author(s):  
Sangon Lee ◽  
Juhee Lim ◽  
Jae Heung Jo ◽  
Jong Ung Lee ◽  
Yun Woo Lee ◽  
...  
Keyword(s):  
Image Motion ◽  
Wide Field

scholarly journals Higher-order neural processing tunes motion neurons to visual ecology in three species of hawkmoths

2017 ◽  
Vol 284 (1857) ◽  
pp. 20170880 ◽  
Author(s):  
A. L. Stöckl ◽  
D. O'Carroll ◽  
E. J. Warrant
Keyword(s):  
Vision System ◽  
Higher Order ◽  
Visual Performance ◽  
Optical Measurements ◽  
Wide Field ◽  
Neural Processing ◽  
Motion Vision ◽  
Light Levels ◽  
Macroglossum Stellatarum ◽  
Deilephila Elpenor

To sample information optimally, sensory systems must adapt to the ecological demands of each animal species. These adaptations can occur peripherally, in the anatomical structures of sensory organs and their receptors; and centrally, as higher-order neural processing in the brain. While a rich body of investigations has focused on peripheral adaptations, our understanding is sparse when it comes to central mechanisms. We quantified how peripheral adaptations in the eyes, and central adaptations in the wide-field motion vision system, set the trade-off between resolution and sensitivity in three species of hawkmoths active at very different light levels: nocturnal Deilephila elpenor, crepuscular Manduca sexta , and diurnal Macroglossum stellatarum. Using optical measurements and physiological recordings from the photoreceptors and wide-field motion neurons in the lobula complex, we demonstrate that all three species use spatial and temporal summation to improve visual performance in dim light. The diurnal Macroglossum relies least on summation, but can only see at brighter intensities. Manduca, with large sensitive eyes, relies less on neural summation than the smaller eyed Deilephila , but both species attain similar visual performance at nocturnal light levels. Our results reveal how the visual systems of these three hawkmoth species are intimately matched to their visual ecologies.

Response Properties and Adaptation of Neurones Sensitive to Image Motion in the Butterfly Papilio Aegeus

1991 ◽  
Vol 161 (1) ◽  
pp. 171-199 ◽  
Author(s):  
T. MADDESS ◽  
R. A. DUBOIS ◽  
M. R. IBBOTSON
Keyword(s):  
Spatial Frequency ◽  
Temporal Resolution ◽  
Optic Lobe ◽  
Image Motion ◽  
Wide Field ◽  
Continuous Motion ◽  
Lobula Plate ◽  
Tuning Curves ◽  
Preferred Direction ◽  
Motion Signal

Wide-field direction-selective neurones from the optic lobes of the butterfly Papilio aegeus show some properties similar to those displayed by the large neurones of the fly lobula plate. Temporal and spatial frequency threshold tuning curves show that butterfly optic lobe neurones sensitive to different directions of image motion are fed by presynaptic subunits similar to those of the fly. However, unlike fly lobula plate neurones, the butterfly optic lobe neurones show a steep low-spatial-frequency roll-off which persists even at high temporal frequencies. Also exceptional is the temporal resolution of rapid changes in image speed by the butterfly neurones. When the cells are adapted to continuous motion their responses indicate a further increase in temporal resolution. Evidence is provided that in any one state of adaptation the neurones may be thought of as piece-wise linear and, thus, their responses can be predicted by convolution with a velocity kernel measured for that adaptation state. Adaptation to continuous motion results in the cells responding to motion in proportion to the mean motion signal. Motion in the non-preferred direction also appears to adapt the cells. Velocity impulse responses of both butterfly and blowfly neurones were determined with one-dimensional gratings and two-dimensional textured patterns and the results for the two stimuli are shown to be very similar.

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