Abstract
This study reports the experimental investigation of G.R., a patient suffering from a highly specific disorder in discriminating mirror stimuli following a right temporoparietal cerebrovascular accident. G.R. showed intact perceptual, attentional, mnestic, linguistic and executive abilities. Object recognition was accurate even under unusual viewing conditions. He was highly accurate in defining the canonical orientation of common objects and in discriminating misoriented objects among identical distracters. However, he was severely impaired in tasks requiring mirror-stimulus discrimination, a deficit that persisted even when the object's coordinates were systematically misaligned with respect to his body. The disorder was also dependent upon the frame of reference (allocentric versus egocentric) activated on the basis of task demands. These results demonstrate the existence of a highly specific disorder in discriminating mirror stimuli defined in object-based coordinates, suggesting a failure in processing the directionality of an object's intrinsic x-axis.
| Original language | English |
|---|---|
| Pages (from-to) | 908-919 |
| Number of pages | 12 |
| Journal | Brain |
| Volume | 126 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 1 2003 |
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Keywords
- Agnosia
- Frames of reference
- Mirror images
- Object recognition
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
Pure agnosia for mirror stimuli after right inferior parietal lesion. / Priftis, Konstantinos; Rusconi, Elena; Umiltà, Carlo; Zorzi, Marco.
In: Brain, Vol. 126, No. 4, 01.04.2003, p. 908-919.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Pure agnosia for mirror stimuli after right inferior parietal lesion
AU - Priftis, Konstantinos
AU - Rusconi, Elena
AU - Umiltà, Carlo
AU - Zorzi, Marco
PY - 2003/4/1
Y1 - 2003/4/1
N2 - This study reports the experimental investigation of G.R., a patient suffering from a highly specific disorder in discriminating mirror stimuli following a right temporoparietal cerebrovascular accident. G.R. showed intact perceptual, attentional, mnestic, linguistic and executive abilities. Object recognition was accurate even under unusual viewing conditions. He was highly accurate in defining the canonical orientation of common objects and in discriminating misoriented objects among identical distracters. However, he was severely impaired in tasks requiring mirror-stimulus discrimination, a deficit that persisted even when the object's coordinates were systematically misaligned with respect to his body. The disorder was also dependent upon the frame of reference (allocentric versus egocentric) activated on the basis of task demands. These results demonstrate the existence of a highly specific disorder in discriminating mirror stimuli defined in object-based coordinates, suggesting a failure in processing the directionality of an object's intrinsic x-axis.
AB - This study reports the experimental investigation of G.R., a patient suffering from a highly specific disorder in discriminating mirror stimuli following a right temporoparietal cerebrovascular accident. G.R. showed intact perceptual, attentional, mnestic, linguistic and executive abilities. Object recognition was accurate even under unusual viewing conditions. He was highly accurate in defining the canonical orientation of common objects and in discriminating misoriented objects among identical distracters. However, he was severely impaired in tasks requiring mirror-stimulus discrimination, a deficit that persisted even when the object's coordinates were systematically misaligned with respect to his body. The disorder was also dependent upon the frame of reference (allocentric versus egocentric) activated on the basis of task demands. These results demonstrate the existence of a highly specific disorder in discriminating mirror stimuli defined in object-based coordinates, suggesting a failure in processing the directionality of an object's intrinsic x-axis.
KW - Agnosia
KW - Frames of reference
KW - Mirror images
KW - Object recognition
UR - http://www.scopus.com/inward/record.url?scp=0037379411&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037379411&partnerID=8YFLogxK
U2 - 10.1093/brain/awg075
DO - 10.1093/brain/awg075
M3 - Article
C2 - 12615647
AN - SCOPUS:0037379411
VL - 126
SP - 908
EP - 919
JO - Brain
JF - Brain
SN - 0006-8950
IS - 4
ER -