MR's Environmental Agnosia

Peretz's Taxonomic Model

MR exhibited impaired recognition of environmental sounds. His environmental agnosia is thereby proportionate relative to his music agnosia. Cases exhibiting a similar pattern of association exist in the literature, but are scarce (Metz-Lutz & Dahl, 1984; Takahashi et al., 1992; Yaqub, Gascon, Al-Nosha, & Whitaker, 1988). However, disproportionate impairment of music recognition, relative to environmental sound recognition, is more common (Eustache et al., 1990; Mendez & Geehan, 1988; Tanaka et al., 1987), and has encouraged Peretz's continued focus at the level of cognition. A higher-level focus has given rise to her notion that the recognition of environmental sounds, compared with musical sounds, relies on a differentiated system (Peretz et al., 1994). MR's co-morbid environmental and music agnosia do not support Peretz's suggestion that the environmental and musical auditory domains represent separate and dissociable processing systems. However, MR's dual deficits are aligned with Peretz's interpretation of associated impairments generally, whereby a lesion may cut across adjacent but separate modules (Peretz et al., 1994). Alternatively, a lower-level perceptual deficit may underlie both of these 'independent' processes.

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