Amplitudes of visually evoked potentials to patterned stimuli: Age and sex comparisons |
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| Institution: | 1. Veterans Administration Medical Center, Salt Lake City, UT 84148, USA;2. Department of Psychology, Utah State University, Logan, UT 84322, USA;3. Department of Psychology, University of Utah, Salt Lake City, UT 84112 U.S.A.;4. Department of Neurology, University of Utah, Salt Lake City, UT 84112 U.S.A.;1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China;2. State Key Laboratory of Advanced Materials and Electronic Components, Guangdong Fenghua Advanced Technology Holding Co Ltd, Guangdong 526020, China;1. Department of Pediatrics, Columbia University College of Physicians and Surgeons, 620 West 168th Street, New York, NY 10032, USA;2. Department of Pathology and Cell Biology, Columbia University College of Physicians and Surgeons, 650 West 168th Street, New York, NY 10032, USA;1. Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan, ROC;2. Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan, ROC;3. Department of Ophthalmology, Tri-Service General Hospital, Taipei, Taiwan, ROC;4. Institute of Pharmacology, National Yang-Ming University, Taipei, Taiwan, ROC;5. Department of Ophthalmology, National Yang-Ming University Hospital, Yilan, Taiwan, ROC;6. National Yang-Ming University School of Medicine, Taipei, Taiwan, ROC;7. Department of Ophthalmology, Shin Kong Wu Ho-Su Memorial Hospital & Fu-Jen Catholic University, Taipei, Taiwan, ROC |
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| Abstract: | Electrophysiological age and sex differences in visual pattern responsivity were investigated. Pattern reversal evoked potentials (PREPs) and visual evoked potentials (VEPs) to patterned and unpatterned flashes were recorded from 20 normal subjects in each of 4 groups: young females and males aged 25–35 years and older females and males aged 55–70 years. PREP waves N70-P100 and P100-N150 from the older women were significantly larger than those from subjects in the other groups; mean amplitudes for the young females, young males and older males were not different. A similar effect, unusually large potentials for the older women, was obtained for VEPs, but only for VEPs elicited by patterned flashes and recorded from occipital scalp, i.e., an area overlying visual cortex which is sensitive to lines and edges. Our findings suggest that the visual system of older females is unusually responsive to patterned stimuli. |
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