Abstract
A letter cancellation task revealed neglect of the lower left quadrant when cancellation began at the top, but of the upper left quadrant when it began in the bottom. When the cancellation was done line by line through a "window" which covered all but the line currently worked on, the quadrant effects disappeared, so that fatigue could not explain these effects. An alternative hypothesis is that as the cancellation progressed, the subject's attention was attracted by progressively more stimuli on the right, and that disengagement difficulty and hence neglect increased proportionately to the number of stimuli.
Full text
PDF
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Halligan P. W., Marshall J. C. Is neglect (only) lateral? A quadrant analysis of line cancellation. J Clin Exp Neuropsychol. 1989 Dec;11(6):793–798. doi: 10.1080/01688638908400936. [DOI] [PubMed] [Google Scholar]
- Mark V. W., Kooistra C. A., Heilman K. M. Hemispatial neglect affected by non-neglected stimuli. Neurology. 1988 Aug;38(8):1207–1211. doi: 10.1212/wnl.38.8.1207. [DOI] [PubMed] [Google Scholar]
- Mennemeier M., Wertman E., Heilman K. M. Neglect of near peripersonal space. Evidence for multidirectional attentional systems in humans. Brain. 1992 Feb;115(Pt 1):37–50. doi: 10.1093/brain/115.1.37. [DOI] [PubMed] [Google Scholar]
- Posner M. I., Cohen Y., Rafal R. D. Neural systems control of spatial orienting. Philos Trans R Soc Lond B Biol Sci. 1982 Jun 25;298(1089):187–198. doi: 10.1098/rstb.1982.0081. [DOI] [PubMed] [Google Scholar]
- Rapcsak S. Z., Cimino C. R., Heilman K. M. Altitudinal neglect. Neurology. 1988 Feb;38(2):277–281. doi: 10.1212/wnl.38.2.277. [DOI] [PubMed] [Google Scholar]
- Shelton P. A., Bowers D., Heilman K. M. Peripersonal and vertical neglect. Brain. 1990 Feb;113(Pt 1):191–205. doi: 10.1093/brain/113.1.191. [DOI] [PubMed] [Google Scholar]
- Weinberg J., Diller L., Gordon W. A., Gerstman L. J., Lieberman A., Lakin P., Hodges G., Ezrachi O. Training sensory awareness and spatial organization in people with right brain damage. Arch Phys Med Rehabil. 1979 Nov;60(11):491–496. [PubMed] [Google Scholar]
- Weinberg J., Diller L., Gordon W. A., Gerstman L. J., Lieberman A., Lakin P., Hodges G., Ezrachi O. Visual scanning training effect on reading-related tasks in acquired right brain damage. Arch Phys Med Rehabil. 1977 Nov;58(11):479–486. [PubMed] [Google Scholar]