An association of the detrimental effect of monocular deprivation on binocular vision with reduced reliability of neuronal responses in the primary visual cortex has been shown on randomly presented binocular stimuli [V. Vorobyov et al. (2007) Eur J Neurosci. 26(12), 3553–3563]. To examine this effect on biologically relevant signals, binocular gratings of varying relative phase disparity were presented in sequential order, simulating motion, to 55 cats with various types of daily visual experience. During sequential stimulation, the proportions of ‘unstable’ cells (with phase differences exceeding 22.5 ° between peak binocular responses in two consecutive trials) were similar in cats with exclusively binocular experience and with short periods of daily monocular vision (≤ 3.25 h), in mixed binocular–monocular conditions. In contrast, random stimulation was characterized by a significantly enlarged population of ‘unstable’ cells in the latter. After a longer period of monocular vision (6.5 h) or exclusively discordant binocular experience (strabismus), sequential stimulation was accompanied by a significant increase of this population, whereas during randomized stimulation it was very similar to that in cats with short periods of daily monocular vision. Finally, there were no differences in populations of ‘unstable’ cells in cats with long monocular or strabismic vision and those with exclusive monocular experience during sequential stimulation, in contrast with a significant increase in the latter during randomized stimulation. I propose that the detrimental effect of abnormal binocular experience on binocular processing in the primary visual cortex is associated with a disruption of the mechanisms involved in both discrimination of binocular disparity signals and evaluation of their temporal profiles. 相似文献
Teller acuity card testing, which is a form of the preferential-looking procedure, is a popular way of assessing visual acuity in preverbal patients. The authors suspected that the clinical judgment of a pediatric ophthalmologist is superior to the Teller acuity cards in diagnosing amblyopia when strabismus is present. Acuity card and fixation preference measurements on each eye were compared at the same clinical visit in a group of 108 strabismus patients. The authors found that the acuity cards could be used to detect amblyopia. However, the pediatric ophthalmologist was more sensitive in diagnosing amblyopia than the Teller acuity cards in the presence of strabismus. 相似文献