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Europa Medicophysica 1998 June;34(2):97-102
Copyright © 1998 EDIZIONI MINERVA MEDICA
language: English
Impaired processing in visual object recognition. A single case study
Granà A. 1, Gattinoni F. 2, Di Benedetto P. 2
1 Department of Psychology, University of Trieste, Italy; 2 Rehabilitation Center, Azienda Ospedaliera “Ospedali Riuniti”, Trieste, Italy
Object recognition is a complex ability which involves the interplay of a number of different functional components (e.g. size, orientation, different types of stored knowledge). In this paper we report the case of S.G., a brain-damaged patient whose visual object recognition deficit was assessed and evaluated with reference to the functional model proposed by Riddoch and Humphreys (BORB). According to the proposed framework, S.G. had no difficulties in encoding or linking together pre-categorical features of visual processing, nor in recognising an object viewed from an unusual prospective. Her ability to retrieve functional characteristics and associations between related objects appeared to be well preserved. By contrast, S.G. failed in comparing the shape of presented objects with the shape of known objects; her object drawing from memory was poor as was her naming. This deficit was interpreted as an impairment at the level of stored knowledge of shapes. An additional deficit in name retrieval was detected. The authors emphasise the importance of making reference to a functional model in order to evaluate and interpret the pattern of acquired cognitive disorders in terms of a specific “functional lesion” of a single or multiple components of the cognitive system. For this purpose, both quantitative and qualitative information of preserved and impaired capabilities must be taken into account.