Brain, Vol. 124, No. 7, 1373-1380,
July 2001
© 2001 Oxford University Press
Left minineglect in dyslexic adults
Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland
Correspondence to:
Riitta Hari, Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, PO Box 2200, FIN-02015 HUT, Espoo, Finland E-mail: hari{at}neuro.hut.fi
We searched for a core mechanism underlying the diverse behavioural and sensorimotor deficits in dyslexic subjects. In psychophysical temporal order judgement and line motion illusion tasks, adult dyslexics processed stimuli in the left visual hemifield significantly (~15 ms) more slowly than normal readers, indicating a left-sided `minineglect'. Furthermore, abrupt stimuli captured attention in both visual hemifields less effectively in dyslexics than in normal readers. These abnormalities could reflect right parietal lobe hypofunction, a consequence of a general magnocellular deficit demonstrated previously. Based on these and previous data, we propose a causal chain which could result in several sensory and cognitive deficits observed in dyslexic subjects.
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