Visual evoked response (VER) changes during maturation in the weddell seal
Abstract Visual evoked responses (VER's) were recorded from the cortex of immature Weddell seals, 3‐365 days of age. Results indicated a high degree of maturity at birth evident from the multiphasic array of waveforms and the comparatively short onset latency of the VER. At low flash intensitie...
| Published in: | Developmental Psychobiology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Wiley
1976
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1002/dev.420090510 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fdev.420090510 https://onlinelibrary.wiley.com/doi/pdf/10.1002/dev.420090510 |
| Summary: | Abstract Visual evoked responses (VER's) were recorded from the cortex of immature Weddell seals, 3‐365 days of age. Results indicated a high degree of maturity at birth evident from the multiphasic array of waveforms and the comparatively short onset latency of the VER. At low flash intensities, single flashes evoked an immature secondary response. Topographical distribution of VER's were confined largely to the gyrus immediately adjacent to midline, from the posterior aspect near lambda to the vertex. Recordings from CI‐744 dosed seals displayed a well‐demarcated developmental sequence of VER's, contrary to VER's recorded in flaxedilized seals. Onset latency and waveform configuration changed concomitantly as a function of age. During the postnatal period from birth to weaning, VER changes were related to major behavioral events such as the seal's first encounter with swimming and diving at 2 weeks of age and weaning at 6 weeks of age. |
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