Journal
NEUROPSYCHOLOGIA
Volume 44, Issue 8, Pages 1406-1412Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropsychologia.2005.12.006
Keywords
psychophysics; power law; modafinil (Provigil); stroke; unilateral neglect
Funding
- NCRR NIH HHS [P20 RR020146, RR020146] Funding Source: Medline
- NIA NIH HHS [R03 AG021256, R03 AG 21256-01] Funding Source: Medline
- NICHD NIH HHS [R01 HD34273-04-05, R03 HD042519, R03 HD042519-01 A1, R01 HD034273, R03 HD40631] Funding Source: Medline
- NIGMS NIH HHS [P30 GM110702] Funding Source: Medline
- NINDS NIH HHS [R01 NS039348, NS39348] Funding Source: Medline
- EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH &HUMAN DEVELOPMENT [R03HD042519, R01HD034273, R03HD040631] Funding Source: NIH RePORTER
- NATIONAL CENTER FOR RESEARCH RESOURCES [P20RR020146] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [R01NS039348] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON AGING [R03AG021256] Funding Source: NIH RePORTER
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There is a growing interest both in identifying the neural mechanisms of magnitude estimation and in identifying forms of bias that can explain aspects of behavioral syndromes like unilateral neglect. Magnitude estimation is associated with activation of temporo-parietal cortex in both cerebral hemispheres of normal subjects; however, it is unclear if and how left hemisphere lesions bias magnitude estimation because the infrequency of neglect and the presence of aphasia in these subjects confound examination. In contrast, we examined magnitude estimation using 12 different types of sensory stimuli that spanned five sensory domains in two patients with very different clinical presentations following unilateral left hemisphere stroke. One patient had neglect sub-acutely without aphasia. The other had aphasia chronically after a temporo-parietal lesion but not neglect. The neglect patient was re-examined 48 It after being treated with modafinil (Provigil) for decreased arousal. Both patients demonstrated bias in magnitude estimation relative to normal subjects (n = 83). Alertness improved in the neglect patient after taking modafinil. His neglect also resolved and his magnitude estimates more closely resembled those of normal subjects. This is the first evidence, to our knowledge, that left hemisphere injury can bias magnitude estimation in a manner similar but not identical to that associated with right hemisphere injury. (c) 2005 Elsevier Ltd. All rights reserved.
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