Gravitational influences on reference frames for mapping somatic stimuli in brain-damaged patients

Andrea Peru, Valentina Moro, Lorenzo Sattibaldi, Jean Sebastien Morgant, Salvatore M. Aglioti

Research output: Contribution to journalArticle

Abstract

Previous studies have shown that the manipulation of body position in space can modulate the manifestations of visual neglect. Here, we investigated in right brain-damaged patients (RBD) the possible influence of gravitational inputs on the capability to detect tactile stimuli delivered to hands positioned in ipsilesional or contralesional space. RBD patients (with or without impairments in detecting contralesional stimuli under single and double stimulation conditions) and healthy control subjects were tested in a tactile detection task in which gravitational (upright vs. supine) and hand position (anatomical vs. crossed) variables were orthogonally varied. The postural manipulation of the entire body turned out to influence the degree of tactile detection. In particular, RBD patients with tactile deficits detected a significantly higher number of left-sided stimuli in the supine posture than in the upright posture. Moreover, crossing of hands improved the ability of RBD patients with tactile deficits in detecting stimuli delivered to their left contralesional hand. The beneficial effect of lying supine was independent of the spatial position of the hands, thus suggesting that the improvement of performance dependent upon entire-body posture and that dependent upon crossing hands may rely upon separate mechanisms.

Original languageEnglish
Pages (from-to)145-152
Number of pages8
JournalExperimental Brain Research
Volume169
Issue number2
DOIs
Publication statusPublished - Feb 2006

Keywords

  • Brain damaged patients
  • Gravity
  • Neglect
  • Somesthetic deficit
  • Tactile extinction

ASJC Scopus subject areas

  • Neuroscience(all)

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