Introduction (R. Mize, R. Marc, A. Sillito). Retina. Expression of GABA-A receptors in the vertebrate retina (N.C. Brecha). The physiology of GABA-A receptors in retinal neurons (A.T. Ishida). The physiology of GABA-B receptors in the vertebrate retina (M.M. Slaughter, Z-H. Pan). Structural organization of GABAergic circuitry in ectotherm retinas (R.E. Marc). Functional organization of GABAergic circuitry in ectotherm retinas (S.M. Wu). GABAergic circuits in the mammalian retina (M.A. Freed). Development of GABAergic neurons in the mammalian retina (D.A. Redburn). Subcortical Visual Pathways. GABA-A and pre- and post-synaptic GABA-B receptor-mediated responses in the lateral geniculate nucleus (I. Soltesz, V. Crunelli). GABAergic circuits in the lateral geniculate nucleus of the cat (D.J. Uhlrich, J. Cucchiaro). Inhibitory GABAergic control of visual signals at the lateral geniculate nucleus (T.T. Norton, D.W. Godwin). The organization of GABAergic neurons in the mammalian superior colliculus (R.R. Mize). The distribution and function of gamma-aminobutyric acid (GABA) in the superior colliculus (Y. Okada). Behavioural consequences of manipulating GABA neurotransmission in the superior colliculus (P. Dean, P. Redgrave). GABAergic neurons and circuits in the pretectal nuclei and the accessory optic systems of mammals (J.J.L. Van Der Want, J.J. Nunes Cardozo, C. van der Togt). The pathways and functions of GABA in the oculomotor system (R.F. Spencer, S-F. Wang, R. Baker). Visual Cortex. GABA-A and GABA-B mediated processes in visual cortex (B.W. Connors). GABA-mediated inhibitory processes in the function of the geniculo-striate system (A. Sillito). GABAergic networks of basket cells in the visual cortex (Z. Kisvarday). Lateral inhibitory interactions in areas 17 and 18 of the visual cortex (U.T. Eysel). The synaptic inputs to simple cells of the cat visual cortex (D. Ferster). GABA-mediated inhibition in the neural networks of visual cortex (N.J. Berman, R. Douglas, K.A.C. Martin). Organization and plasticity of GABA neurons and receptors in monkey visual cortex (S. Hendry, R. Carder). Molecular properties of GABAergic local-circuit neurons in the mammalian visual cortex (C.J. Barnstable et al). Development of GABA-containing neurons in visual cortex (J.G. Parnavelas).