2026-09-21T05:09:58Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/22014 2023-07-10 col_2142_5131 col_2142_11614 com_2142_5130 com_2142_11613 com_2142_8903

(UMI)AAI9712436 http://hdl.handle.net/2142/22014 eng Copyright 1996 Seymoure, Penny Psychology, Psychobiology Psychology, Developmental Psychology, Physiological Juraska, Janice M. Seymoure, Penny 2011-05-07T13:26:12Z 2011-05-07T13:26:12Z 10000-01-01 1996 Although anatomical sex differences are pervasive in the primary visual cortex of hooded rats, it is not known whether sex differences occur in vision in these animals. The purpose of this dissertation is to examine whether sex differences in morphology in the visual cortex of adult hooded rats influence vision in littermate pairs of male and female hooded rats. Three types of visual functions--grating acuity, vernier acuity, and motion parallax information--that are processed in the primary visual cortex were examined. Grating acuity was measured in a forced choice Y-maze and a jumping stand. Using a criterion of 34 correct/50 trials, grating acuity for both sexes was high (1.0-1.6 cycle/degree). Females made more correct identifications of the coarse gratings (0.125 and 0.25 c/deg) than males, but no sex differences were found for higher spatial frequencies. Vernier acuity thresholds were established in the jumping stand. In contrast to grating acuity, males were better at detecting smaller vernier offsets in both individual criterion and group averages than females. All of the rats were able to detect vernier misalignments (15.6 min of arc; 1.9 c/deg) above their level of grating acuity, and several subjects had vernier thresholds that exceeded the estimated Nyquist limit for hooded rats. In the third experiment, male and female rats, given a checkerboard distance cue in a fixed or movable position, were trained to jump up to 40cm from one elevated platform to another. There was no difference in the landing accuracy or in the number or size of head bobs that were generated to produce motion parallax information for distance estimation by male and female rats. Thus, there is evidence of sex differences in one visual function in rats that may mirror differences in the primary visual cortex. Made available in DSpace on 2011-05-07T13:26:12Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712436.pdf: 4883294 bytes, checksum: 65fa223cc4bd3b5e3328b2215f2a05b0 (MD5) Previous issue date: 1996 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:54:44Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:25:28-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only 9780591199932 AAI9712436 Behavioral measurements of visual processing in adult male and female hooded rats: Do visual tasks reflect sex differences in visual cortex morphology? text Psychology Psychology University of Illinois at Urbana-Champaign Dissertation Ph.D.