| | 1 | Author
| David Dvorak, Allan Snyder | Requires cookie* | | | Title
| The Relationship between Visual Acuity and Illumination in the Fly, Lucilia sericata  | | | | Abstract
| The variation in visual acuity with illumination has been studied by monitoring the extracellular response of direction sensitive motion detecting neurons to a drifting sine wave grating displayed upon an oscilloscope spreen. Acuity reaches a maximum value of 0.46 cycles/degree at luminances above 1.0 cd/m2 and decreases gradually over a 3.8 log unit attenuation in intensity to a minimum value of 0.05 cycles/degree. The results have been compared with theoretical acuity curves for the coupound eye with various dark adaptation mechanisms. The analysis indicates that a major strategy of dark adaptation in the fly is a process involving intensity-dependent neural summation of signals from photoreceptors having different visual axes. | | | |
Reference
| Z. Naturforsch. 33c, 139 (1978); received November 9 1977 | | | |
Published
| 1978 | | | |
Keywords
| Diptera, Insect, Vision, Visual Acuity, Electrophysiology | | | |
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| default:Reihe_C/33/ZNC-1978-33c-0139.pdf | | | | Identifier
| ZNC-1978-33c-0139 | | | | Volume
| 33 | |
| 2 | Author
| Uwe Homberg, Joachim Erber | Requires cookie* | | | Title
| Response Characteristics and Identification of Extrinsic Mushroom Body Neurons of the Bee | | | | Abstract
| The activity o f single neurons with constant discharge frequencies in the area around the a-lobe o f the mushroom bodies o f the bee was recorded intracellularly. The spontaneous discharge fre quency o f these neurons ranged between 5 and 95 im pulses per second. W hen stimulated, about 80 percent o f the neurons responded to at least one o f five different sensory modalities: scent; light; air current to the antennae; sugar water applied to the antennae and to the proboscis. 45 percent o f the neurons responded to two or more m odalities, these multimodal neurons are com mon in the median protocerebrum o f the bee. The differentiated response pattern o f the cells does not allow a simple classification. Som e o f the neurons were identified after the injection o f the flu orescent dye Procion yellow. W e found 4 neurons with arborizations in the a-lobe and the calyces o f the mushroom bodies. | | | |
Reference
| Z. Naturforsch. 34c, 612 (1979); received April 12 1979 | | | |
Published
| 1979 | | | |
Keywords
| Bee, Brain, M ushroom Bodies, Electrophysiology, Identified Neurons | | | |
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| default:Reihe_C/34/ZNC-1979-34c-0612.pdf | | | | Identifier
| ZNC-1979-34c-0612 | | | | Volume
| 34 | |
| 3 | Author
| Gerhard Heide | Requires cookie* | | | Title
| The Influence of Wingbeat Synchronous Feedback on the Motor Output Systems in Flies | | | | Abstract
| Action potentials have been recorded from fibrillar and from non-fibrillar flight muscles of tethered flying flies (Calliphora erythrocephala and M usca dom estica). Analyses of the spike-trains from the fibrillar muscles reveal a clear preference of the spikes to appear at a special phase with respect to the wingbeat cycle. This holds true even in cases of ex perim entally changed motor output patterns. There seems to be some kind of wingbeat-synchronous feedback which influences the output system phasically. Crosscorrelations between spike-trains from the fibrillar muscles on the one hand and the non-fibrillar muscles on the other give evidence that there are strong interactions between the output producing neurons of both systems with at least one inhibitory pathway. | | | |
Reference
| (Z. Naturforsch. 29c, 739 [1974]; received August 2 1974) | | | |
Published
| 1974 | | | |
Keywords
| Calliphora, Musca, Insect Flight, Motor O utput, Flight Muscles, Electrophysiology | | | |
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| default:Reihe_C/29/ZNC-1974-29c-0739.pdf | | | | Identifier
| ZNC-1974-29c-0739 | | | | Volume
| 29 | |
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