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Saccadic abnormalities in psychotic patients. II. The role of neuroleptic treatment

Published online by Cambridge University Press:  09 July 2009

T. J. Crawford
Affiliation:
Academic Unit of Neuroscience, Charing Cross and Westminster Medical School; Department of Psychiatry, University of Leicester School of Medicine, Leicester Royal Infirmary; Division of Psychology, University of Hertfordshire, Hatfield, Herts.
B. Haeger
Affiliation:
Academic Unit of Neuroscience, Charing Cross and Westminster Medical School; Department of Psychiatry, University of Leicester School of Medicine, Leicester Royal Infirmary; Division of Psychology, University of Hertfordshire, Hatfield, Herts.
C. Kennard
Affiliation:
Academic Unit of Neuroscience, Charing Cross and Westminster Medical School; Department of Psychiatry, University of Leicester School of Medicine, Leicester Royal Infirmary; Division of Psychology, University of Hertfordshire, Hatfield, Herts.
M. A. Reveley
Affiliation:
Academic Unit of Neuroscience, Charing Cross and Westminster Medical School; Department of Psychiatry, University of Leicester School of Medicine, Leicester Royal Infirmary; Division of Psychology, University of Hertfordshire, Hatfield, Herts.
L. Henderson*
Affiliation:
Academic Unit of Neuroscience, Charing Cross and Westminster Medical School; Department of Psychiatry, University of Leicester School of Medicine, Leicester Royal Infirmary; Division of Psychology, University of Hertfordshire, Hatfield, Herts.
*
1 Address for correspondence: Professor L. Henderson, Academic Unit or Neuroscience, Charing Cross and Westminster Medical School, Fulham Palace Road, London W6 8RF.

Synopsis

The effects of dopamine-antagonistic neuroleptic (NL) medication on saccadic eye movements were compared in matched groups of 40 NL-treated and 18 NL-free schizophrenic patients and in 18 NL-treated and 14 NL-free bipolar affective patients. Manipulation of the saccadic paradigm yielded data on four types of saccade: those reflexively elicited by novel stimuli (REFLEX saccades), those directed towards the remembered location of a target now extinguished (REM) or towards the location where a predictably alternating target is expected to appear (PRED), or ANTI saccades, directed away from the stimulus to the mirror image location. Extensive psychiatric, neurological and neuropsychological assessments were also carried out on all subjects. The saccades of NL-treated patients, regardless of diagnosis, were less spatially accurate than those of NL-free patients, with a greater tendency to fall short of the target when generated towards the locus of a mentally represented target. This effect was greatest with a predictably alternating target, especially during periods when target visibility was withdrawn, only a temporal cue remaining. This pattern of impairment which is also found in early stages of Parkinson's disease is likely to be due to deficiency of striatal dopamine. Its best clinical predictors were disease duration, and Webster–Parkinsonism scores. Failure to suppress reflexive saccades to the stimulus in the REM and ANTI paradigms were more closely associated with schizophrenia than with NL treatment and were best predicted by negative symptoms and Wisconsin perseverative errors, both of which are widely regarded as indicators of frontal lobe dysfunction.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1995

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