Part 1 Imaging of the cerebral hemisphere: mapping human brain activity non-invasively by nuclear magnetic resonance, K. Ugurbil et al; mapping cortical functions using PET activation technique, M. Senda; music and the brain - evidence from amusia and from PET studies of normal subjects, J. Sergent; evolution of cortical metabolism and blood flow during recovery from aphasia, K. Nagata et al. Part 2 Stimulation of the cerebral hemisphere: studies of conscious experience using electrical stimulation of human brain - the neural time-factor, B. Libet; electrical stimulation of motor cortex - neural basis and cortical mapping, I. Suzuki et al; Transcranial magnetic stimulation in the study of human cognitive function, A. Pascual-Leone et al; effect of repetitive transcranial magnetic stimulation on cognitive function, Y. Takayama and M. Sugishita. Part 3 Psychological approach: cortical colour blindness spares colour input to motion perception, P. Cavanagh et al; selective attention in visual pattern perception, J. Watanabe. Part 4 Callosal lesions: perceptual integration following commissurotomy - a reappraisal, M.C. Corballis; fundus tachistoscope and its application to the study of the commissurotomy patient, M. Sugishita et al; optimal range of callosal section based on cortical lesion and function, H. Shimizu et al. Part 5 Hemispheric lesions: the influence of brain atrophy and irritability on right hemisphere stroke syndromes, D.N. Levine; mechanisms of unilateral spatial neglect, S. Ishiai; category - and modality-specific deficits in lexical processing, A. Hillis and A. Caramazza.