In lower vertebrates such as frogs and chickens, monocular optokinetic nystagmus (OKN) displays directional asymmetry, temporal-nasal (T-N) stimulation being more efficient in evoking this visuomotor reflex than N-T stimulation. The N-T component of monocular OKN is significantly weaker in chickens, while it is almost absent in frogs. Coil recordings showed that in adult frogs and chickens, prolonged monocular visual deprivation by unilateral eyelid suture provoked the appearance of the N-T component in frogs as well as its significant and progressive increase in both species. The administration of THIP, a GABAA agonist, abolished reversibly the increase of the N-T component in both species. This fact suggests that the GABAergic system could be involved in determining this plasticity process observed in adult lower vertebrates.
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