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Functional organization in electroreceptive midbrain of the catfish

Functional organization in electroreceptive midbrain of the catfish ERIC I. KNUDSEN SUMMARY AND CONCLUSIONS I. The response properties of electroreceptive units in the torus semicircularis (TS) of the catfish (kttrlruws nthlosrrs) were analyzed for evidence of . The effects of both frequency and spatial parameters of electric-field stimuli were investigated. Uniform electric fields were used in studying response latencies, field-gradient orientation preferences, and frequency tuning. Weak dipole electric fields were used in studying unit receptive fields and selectivity for direction and speed of stimulus movement. 2. The field-gradient orientation preferences of single units rarely corresponded to that of the evoked potential recorded at the same locus. Thus, the known systematic change in the preferred field orientation of the evoked potential with rostrocaudal recording location was not a determinant of at the unit level. However, along the dorsoventral axis of the TS, the field orientation preferences of units did follow a pattern: units located in the dorsal 135 pm largely preferred field orientations between 180 and 360”; among units deeper than 125 pm this tendency reversed to a preference for field’orientations between 0 and 180”. 3. Receptive fields could be found for 77% of the electroreceptive units. Three types of receptive fields were distinguished based on spatial http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurophysiology The American Physiological Society

Functional organization in electroreceptive midbrain of the catfish

E. I. Knudsen
Journal of Neurophysiology , Volume 41: 350 – Mar 1, 1978
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Publisher
The American Physiological Society
Copyright
Copyright © 1978 the American Physiological Society
ISSN
0022-3077
eISSN
1522-1598
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Abstract

ERIC I. KNUDSEN SUMMARY AND CONCLUSIONS I. The response properties of electroreceptive units in the torus semicircularis (TS) of the catfish (kttrlruws nthlosrrs) were analyzed for evidence of . The effects of both frequency and spatial parameters of electric-field stimuli were investigated. Uniform electric fields were used in studying response latencies, field-gradient orientation preferences, and frequency tuning. Weak dipole electric fields were used in studying unit receptive fields and selectivity for direction and speed of stimulus movement. 2. The field-gradient orientation preferences of single units rarely corresponded to that of the evoked potential recorded at the same locus. Thus, the known systematic change in the preferred field orientation of the evoked potential with rostrocaudal recording location was not a determinant of at the unit level. However, along the dorsoventral axis of the TS, the field orientation preferences of units did follow a pattern: units located in the dorsal 135 pm largely preferred field orientations between 180 and 360”; among units deeper than 125 pm this tendency reversed to a preference for field’orientations between 0 and 180”. 3. Receptive fields could be found for 77% of the electroreceptive units. Three types of receptive fields were distinguished based on spatial

Journal

Journal of Neurophysiology – The American Physiological Society

Published: Mar 1, 1978

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