Jean Marc Flandrin

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Unilateral lesions of the middle suprasylvian gyrus in the cat parietal cortex produce an asymmetrical vestibulo-ocular reflex such that responses to head rotation toward the side opposite to the lesion become weaker. Unilateral lesions of the superior colliculus in the cat also produce the same effect. In either case symmetrical responses are recovered(More)
The aim of this study was to evaluate the functional significance of similarities observed in the anatomy and the physiology of cat and ferret visual systems. Optokinetic nystagmus (OKN) in response to movement of the entire visual field, and optokinetic after nystagmus (OKAN) were measured in 8 ferrets with binocular stimulation. A shift of the beating(More)
Unilateral lesions of the cerebellar flocculus were made in two groups of cats chronically implanted for eye-movement recording. In the first group (3 cats), the floccular lesion preceded by 40-70 days a unilateral labyrinthectomy on the contralateral side. In the second group (5 cats), the serial order of the two lesions was reverted, the unilateral(More)
Cats reared in stroboscopic illumination (strobe reared cats) have been found to have abnormal eye movements. Visual and vestibular evoked compensatory eye movements were inefficient. Vestibuloocular reflex in the dark had a maximum gain of 0.6 (1.0 in normal animals). Optokinetic nystagmus had a mean gain which approached unity only at stimulus velocities(More)
Binocular and monocular gain of optokinetic nystagmus (OKN), OKN dynamics, vestibulo-ocular reflex (VOR) and VOR adaptation were measured in 5 normal cats and in 5 cats which underwent bilateral visual cortical lesions involving the 17–18 complex at least 4 months before testing. We observed longterm deficits after bilateral lesions involving area 17 and(More)
Vestibulo-ocular response (VOR) has been recorded in kittens aged between 10 and 61 postnatal days. Responses to velocity steps and to sinusoidal oscillations are present on the earliest recordings, though they are limited to a low gain slow compensatory gaze displacement. Vestibular-induced saccades appear only around postnatal day 30, but adult-like(More)
Unit recordings were made in the superior colliculus of strobe-reared cats. Receptive field properties were studied and electrical stimulation in the chiasma and optic tract made it possible to characterize the visual input. The retinal Y-cell input and the cortical input were found to be deficient. The principal response deficit was the decrease of(More)
1. Unilateral lesions of the superior colliculus were made in normal cats. Following the operation, animals exhibited a typical neglect for contralateral visual space and forced circling toward the ipsilateral side. Optokinetic nystagmus was decreased for a stimulus moving toward the ipsilateral side, particularly in the temporal-to-nasal direction when the(More)
Unilateral lesions of the cerebellar flocculus were performed in three chronically-implanted adult cats. Following the lesion a spontaneous nystagmus was observed in the dark, with the fast phase directed to the lesioned side. Vestibulo-ocular responses in the dark became asymmetrical. Responses to velocity steps exciting the labyrinth ipsilateral to the(More)