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Left neglect dyslexia: Perseveration and reading error types.

Roberta Ronchi1, Lorella Algeri2, Laura Chiapella2

  • 1Laboratory of Cognitive Neuroscience, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, Campus Biotech H4, Chemin des Mines 9, 1202 Geneva, Switzerland; Neuropsychological Laboratory, S. Luca Hospital, IRCCS Istituto Auxologico Italiano, Via Mercalli 32, 20122 Milano, Italy.

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Summary

Patients with neglect dyslexia exhibit distinct reading errors. Perseveration in visuo-motor tasks correlates with substitution errors, while its absence links to omissions in neglect dyslexia.

Keywords:
Left unilateral spatial neglectNeglect dyslexiaOmission and substitution reading errorsRecurrent perseverationRight-brain-damaged patients

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Right-brain damage can cause neglect dyslexia, a reading disorder.
  • Left neglect dyslexia involves omitting, substituting, or adding letters, primarily on the left side of text.
  • Recurrent perseveration is a visuo-motor deficit involving extraneous mark additions.

Purpose of the Study:

  • To investigate the association between reading error types in left neglect dyslexia and recurrent perseveration.
  • To determine if different productive symptoms in reading and visuo-motor domains co-occur in patients with left spatial neglect.

Main Methods:

  • Studied 54 right-brain-damaged patients, 50 with left spatial neglect.
  • Identified 27 patients with both left spatial neglect and left neglect dyslexia.
  • Analyzed reading error patterns (omissions, substitutions, additions) and presence/absence of perseveration.

Main Results:

  • Patients with neglect dyslexia and perseveration predominantly made substitution errors.
  • Neglect dyslexic patients without perseveration primarily made omission errors.
  • Addition errors were infrequent in both groups.

Conclusions:

  • Omission and substitution errors in neglect dyslexia may stem from different underlying pathological mechanisms.
  • Defective response inhibition could contribute to both perseveration and substitution errors in reading.
  • Productive symptoms and left-sided spatial attention deficits shape neglect dyslexia and spatial neglect manifestations.