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Abnormal line bisection judgements in children with Tourette's syndrome.

D M Sheppard¹, J L Bradshaw, J B Mattingley

¹The Brigantia Building, School of Psychology, University of Wales, Penrallt Rd, Bangor, Wales LL57 2AS, Gwynedd, UK. d.sheppard@bangor.ac.uk

Neuropsychologia

|October 31, 2001

Summary

Children with Tourette's syndrome (TS) exhibit abnormal rightward bias in visuospatial attention tasks, suggesting lateralized brain dysfunction. This finding aligns with attention deficits seen in other neurological conditions.

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Area of Science:

Neuroscience
Developmental Psychology
Clinical Neurology

Background:

Tourette's syndrome (TS) is linked to altered basal ganglia and functional asymmetry.
Previous research indicates atypical performance on visuospatial tasks in TS, including line bisection.

Purpose of the Study:

To investigate the lateralization of visuospatial attention in children diagnosed with Tourette's syndrome.
To determine if an irrelevant moving visual stimulus affects line bisection judgments in TS.

Main Methods:

Nine children with Tourette's syndrome and nine age/sex/IQ-matched controls participated.
Participants performed line bisection tasks with blank or moving random-dot backgrounds.
Stimulus conditions included varying dot movement direction and speed.

Main Results:

Children with Tourette's syndrome showed a significant rightward bias in line bisection.
This rightward bias in TS was similar to previously observed patterns in attention-deficit/hyperactivity disorder (ADHD).
Moving backgrounds did not impact bisection performance in either TS children or controls.

Conclusions:

The findings suggest a visuospatial attention deficit in Tourette's syndrome.
This deficit supports the hypothesis of lateralized frontostriatal circuitry dysfunction in TS.
Further research into the neurobiological underpinnings of attention in TS is warranted.