Accession Number : ADA327400

Title :   Neural Systems Underlying Visual Recognition in Humans.

Descriptive Note : Progress rept. 30 Sep 94-1 Oct 95,

Corporate Author : IOWA UNIV IOWA CITY COLL OF MEDICINE

Personal Author(s) : Damasio, Antonio R.

PDF Url : ADA327400

Report Date : FEB 1996

Pagination or Media Count : 10

Abstract : Recent findings from our laboratory indicate that brain-damaged patients can manifest category-specific defects in the retrieval of conceptual knowledge for concrete entities. For example, patients may lose the ability to recognize many animals, but remain entirely normal in their ability to recognize tools; or the reverse may occur. These findings raise interesting questions about the mechanisms of knowledge retrieval defects. It has been suggested, for example, that category-related recognition defects are attributable to the origin of the entities, in terms of whether they are natural (animate, living) or artifactual (manufactured, inanimate, nonliving) (e.g., Warrington & Shallice, 1984). This account has been challenged by those who have seen these defects as a reflection of factors such as familiarity, frequency, and prototypicality (e.g., Farah et al., 1991; Funnell & Sheridan, 1992; Stewart et al., 1992); or as a reflection of the underlying 'difficulty' that makes some entities inherently harder to recognize (e.g., Capitani et al., 1994).

Descriptors :   *NERVOUS SYSTEM, *RECOGNITION, *VISUAL PERCEPTION, *BRAIN DAMAGE, CONCRETE, REFLECTION, DEFECTS(MATERIALS), ANIMALS, PATIENTS.

Subject Categories : Anatomy and Physiology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE