AI Article Synopsis
- The study investigates the cognitive mechanisms behind personal neglect, particularly focusing on how individuals with right hemisphere brain lesions represent their bodies and nearby spaces.
- Researchers compared 22 patients with right hemisphere lesions (7 with personal neglect) and 13 healthy controls using tasks that involved identifying left and right hands and mirrors.
- Results showed that patients with personal neglect struggled more with identifying left-sided stimuli, indicating that poor body representation is a key factor in this condition, while other issues like space neglect or motor impairments did not significantly relate to personal neglect.
Article Abstract
The cognitive mechanisms underlying personal neglect are not well known. One theory postulates that personal neglect is due to a disorder of contralesional body representation. In the present study, we have investigated whether personal neglect is best explained by impairments in the representation of the contralesional side of the body, in particular, or a dysfunction of the mental representation of the contralesional space in general. For this, 22 patients with right hemisphere cerebral lesions (7 with personal neglect, 15 without personal neglect) and 13 healthy controls have been studied using two experimental tasks measuring representation of the body and extrapersonal space. In the tasks, photographs of left and right hands as well as left and right rear-view mirrors presented from the front and the back had to be judged as left or right. Our results show that patients with personal neglect made more errors when asked to judge stimuli of left hands and left rear-view mirrors than either patients without personal neglect or healthy controls. Furthermore, regression analyses indicated that errors in interpreting left hands were the best predictor of personal neglect, while other variables such as extrapersonal neglect, somatosensory or motor impairments, or deficits in left extrapersonal space representation had no predictive value of personal neglect. These findings suggest that deficient body representation is the major mechanism underlying personal neglect.
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| http://dx.doi.org/10.1016/j.neuropsychologia.2011.01.043 | DOI Listing |
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