Reports of columnar organization of the macaque inferotemporal cortex (Tana
ka, 1992, 1993a) indicate that ensembles of cells responding to particular
objects may be both sufficiently extensive and properly localized to allow
their detection and discrimination by means of functional magnetic resonanc
e imaging (fMRI). A recently developed theory of object representation by e
nsembles of coarsely tuned units (Edelman, 1998; Edelman & Duvdevani-Bar, 1
997b) and its implementation as a computer model of recognition and categor
ization (Cutzu & Edelman, 1998; Edelman & Duvdevani-Bar, 1997a) provide a c
omputational framework in which such findings can be interpreted in a strai
ghtforward fashion. Taken together, these developments in the study of obje
ct representation and recognition suggest that direct visualization of the
internal representations may be easier than was previously thought. In this
paper, we show how fMRI techniques can be used to investigate the internal
representation of objects in the human visual cortex. Our initial results
reveal that the activation of most voxels in object-related areas remains u
naffected by a coarse scrambling of the natural images used as stimuli and
that a map of the representation space of abject categories in individual s
ubjects can be derived from the distributed pattern of voxel activation in
those areas.