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Istituto di scienze e tecnologie della cognizione

Torna all'elenco Contributi in rivista anno 2014

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Line and word bisection in right-brain-damaged patients with left spatial neglect

Anno di pubblicazione: 2014

Formato: Elettronico

Autori: Veronelli, Laura; Vallar, Giuseppe; Marinelli, Chiara V.; Primativo, Silvia; Arduino, Lisa S.

Affiliazioni autori: University of Milano-Bicocca; Casa Cura Policlin; Istituto Auxologico Italiano; Sapienza University Rome; Fdn Hosp Santa Lucia; Univ LUMSA; ISTC CNR

Autori CNR:

  • LISA ARDUINO

Lingua: inglese

Abstract: Right-brain-damaged patients with left unilateral spatial neglect typically set the mid-point of horizontal lines to the right of the objective center. By contrast, healthy participants exhibit a reversed bias (pseudoneglect). The same effect has been described also when bisecting orthographic strings. In particular, for this latter kind of stimulus, some recent studies have shown that visuo-perceptual characteristics, like stimulus length, may contribute to both the magnitude and the direction bias of the bisection performance (Arduino et al. in Neuropsychologia 48:2140-2146, 2010). Furthermore, word stress was shown to modulate reading performances in both healthy participants, and patients with left spatial neglect and neglect dyslexia (Cubelli and Beschin in Brain Lang 95:319-326, 2005; Rusconi et al. in Neuropsychology 18:135-140, 2004). In Experiment I, 22 right-brain-damaged patients (11 with left visuo-spatial neglect) and 11 matched neurologically unimpaired control participants were asked to set the subjective mid-point of word letter strings, and of lines of comparable length. Most patients exhibited an overall disproportionate rightward bias, sensitive to stimulus length, and similar for words and lines. Importantly, in individual patients, biases differed according to stimulus type (words vs. lines), indicating that at least partly different mechanisms may be involved. In Experiment II, the putative effects on the bisection bias of ortho-phonological information (i.e., word stress endings), arising from the non-neglected right hand side of the stimulus were investigated. The orthographic cue induced a rightward shift of the perceived mid-point in both patients and controls, with short words stressed on the antepenultimate final sequence inducing a smaller rightward deviation with respect to short words stressed on the penultimate final sequence. In conclusion, partly different mechanisms, including both visuo-spatial and lexical factors, may support line and word bisection performance of right-brain-damaged patients with left spatial neglect, and healthy participants.

Lingua abstract: inglese

Pagine da: 133

Pagine a: 146

Pagine totali: 14

Rivista:

Experimental brain research Springer
Paese di pubblicazione: Germania
Lingua: multilingue
ISSN: 0014-4819

Numero volume: 232

Numero fascicolo: 1

DOI: 10.1007/s00221-013-3726-7

Referee: Sė: Internazionale

Indicizzato da: ISI Web of Science (WOS) [000329233400013]

Parole chiave:

  • Unilateral spatial neglect
  • Word bisection
  • Line bisection
  • Word stress
  • Lexical variables
  • Neglect dyslexia

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