Summary
Since the pulvinar receives a major ascending projection of the superior colliculus, pulvinar lesions might produce behavioral impairments resembling those that follow colliculus lesions. To test this possibility, we examined the effect of pulvinar lesions in monkeys on the localization and detection of brief light flashes, a task in which monkeys with colliculus lesions are severely impaired. Some of the pulvinar-lesioned monkeys showed localization impairments similar to those in monkeys with colliculus lesions. However, histological analyses of the lesions suggested that these deficits were related not to the pulvinar damage per se, but rather to interruption of corticotectal fibers that pass through the pulvinar. We conclude that the pulvinar is not critical for the ability to locate and detect brief visual stimuli.
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Supported by research grants MH 26489 from the National Institute of Mental Health and EY02254 from the National Eye Institute
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Leiby, C.C., Bender, D.B. & Butter, C.M. Localization and detection of visual stimuli in monkeys with pulvinar lesions. Exp Brain Res 48, 449–454 (1982). https://doi.org/10.1007/BF00238622
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DOI: https://doi.org/10.1007/BF00238622