Magnetic misreaching

David Peter Matthew Carey, R J Coleman, S Della Sala

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Ms D., a 76 year-old woman with a slowly progressive bilateral parietal lobe degeneration, showed an unusual variant of misreaching as yet unreported. When required to reach to a target in extrafoveal vision, she slavishly reached straight to the foveal fixation point instead ("magnetic misreaching"). Three dimensional recordings of limb movements to foveal and extrafoveal targets revealed that her reach endpoints were determined by the place she was looking, independent of the distance between target and fixation point. The sign was present in both hands. Magnetic misreaching differs from motor misbehaviours which follow frontal lobe damage. The neuropsychological and behavioural profile of Ms D., coupled with neuroimaging evidence suggest that magnetic misreaching is a manifestation of parietal lobe dysfunction.

Original languageEnglish
Pages (from-to)639-652
Number of pages14
JournalCortex
Volume33
Issue number4
Publication statusPublished - Dec 1997

Keywords

  • PARIETAL ASSOCIATION CORTEX
  • CORTICOBASAL DEGENERATION
  • UTILIZATION BEHAVIOR
  • FRONTAL LOBES
  • ALZHEIMERS-DISEASE
  • APRAXIA
  • LESIONS
  • EYE
  • ORGANIZATION
  • IMITATION

Cite this

Carey, D. P. M., Coleman, R. J., & Della Sala, S. (1997). Magnetic misreaching. Cortex, 33(4), 639-652.