Binocular neuronal responsiveness in Clare-Bishop cortex of Siamese cats.

Retinotopy and binocular responsiveness were studied extracellularly in a total of 278, 61, 110 and 275 cells sampled in areas 17, 18, 19 and Clare-Bishop (CB) of Siamese cats. The misalignment of the visual axes of the two eyes was determined by the pupil reflex method in the behaving animal. The recording sessions were conducted under N2O anesthesia, supplemented with continuous infusion of short-lasting anesthetics (Saffan, Glaxo) and muscle relaxants (Gallamine triethiodide) using two types of visual stimulators presenting two-dimensional (2D) motion stimuli and the visual cues for three-dimensional (3D) motion.

Preservation of position and motion stereopsis in strabismic subjects.

Preservation of position (PS) and motion stereopsis (MS) of strabismic subjects in central and peripheral visual fields (N = 51) was studied in relationship with various strabismic parameters and aspects: present and past squint angles, age at the time of strabismic appearance and the first treatment, present visual acuities, and present and past strabismic polarity (convergent or divergent). The present squint angle was the only major parameter relevant for the preservation of PS and MS. The critical squint angle for the preservation was virtually null for central MS (it was present in 12 of the 16 subjects with squint angles smaller than the critical value), 2 degrees for central PS (17/18), 5 degrees for peripheral PS (23/28), and 10 degrees for peripheral MS (37/42).