TY - JOUR
T1 - Levels of representation, co-ordinate frames, and unilateral neglect
AU - Caramazzas, Alfonso
AU - Hillis, Argye E.
N1 - Funding Information:
The research reported here was supported in part by N.I.H. grant NS22201 and by grants from the Seaver Institute and the McDonneW'ew Program in Cognitive Neuroscience. This support is gratefully acknowledged. We would especially like to thank NG for her patience and good cheer throughout our interminable experiments and probings. We are grateful to the members of the Cognitive Neuropsychology Laboratory, and in particular Brenda Rapp, for their helpful suggestions at various points of the research reported here. We thank Howard Egeth, Glyn Humphreys, Brenda Rapp. Jane Riddoch, Tim Shal- lice, Eric Siiroff. Paolo Viviani, and Steven Yantis for comments on an earlier version of this paper.
PY - 1990/11/1
Y1 - 1990/11/1
N2 - We describe the performance of a brain-damaged subject, NG, who made reading errors only on the right half of words. This problem persisted even when the subject had demonstrated accurate recognition of the letters in a stimulus through naming all the letters. Furthermore, the spatially determined reading impairment was unaffected by topographic transformations of stimuli: identical performance was obtained for stimuli presented in horizontal, vertical, and mirror-reversed form. The same pattern of errors was also obtained in all forms of spelling tasks: written spelling, oral spelling, and backward oral spelling. The performance of the subject is interpreted in the context of a multi-stage model of the word recognition process. It is concluded that the locus of the deficit responsible for NG's reading impairment is at a stage of processing where word-centred grapheme representations are computed. The spatially determined pattern of performance reported for NG, as well as other patterns observed for other brain-damaged subjects, are interpreted as providing support for the proposed multi-stage model of word recognition. The more general implications of the reported results for models of visual processing and attention are also considered.
AB - We describe the performance of a brain-damaged subject, NG, who made reading errors only on the right half of words. This problem persisted even when the subject had demonstrated accurate recognition of the letters in a stimulus through naming all the letters. Furthermore, the spatially determined reading impairment was unaffected by topographic transformations of stimuli: identical performance was obtained for stimuli presented in horizontal, vertical, and mirror-reversed form. The same pattern of errors was also obtained in all forms of spelling tasks: written spelling, oral spelling, and backward oral spelling. The performance of the subject is interpreted in the context of a multi-stage model of the word recognition process. It is concluded that the locus of the deficit responsible for NG's reading impairment is at a stage of processing where word-centred grapheme representations are computed. The spatially determined pattern of performance reported for NG, as well as other patterns observed for other brain-damaged subjects, are interpreted as providing support for the proposed multi-stage model of word recognition. The more general implications of the reported results for models of visual processing and attention are also considered.
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U2 - 10.1080/02643299008253450
DO - 10.1080/02643299008253450
M3 - Article
AN - SCOPUS:0025648721
VL - 7
SP - 391
EP - 445
JO - Cognitive Neuropsychology
JF - Cognitive Neuropsychology
SN - 0264-3294
IS - 5-6
ER -