Abstract
Abstract There is evidence from the literature, based on normal human subjects and on animals, to suggest that some stages of the object recognition process code images in a manner that carries no enantiomorphy (i.e. mirror-image) information. A patient, RJ, is reported who is severely impaired in discriminating between mirror-image objects. He can successfully discriminate between objects that differ by a minor structural alteration, or by rotation in the picture-plane. He can also discriminate between mirror-image words. In addition, RJ can reliably recognize objects, including those used in the mirror-image task. Various explanations for these unusual findings are discussed, the most probable of which is that RJ lacks a suitable egocentric reference frame, or is unable to compare such a reference frame with the type of representation employed for the purposes of object recognition.
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