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Abstract
Smooth-pursuit eye-movement (SPEM) abnormalities have been consistenly observed in
schizophrenia. The SPEM changes in schizophrenia are not thought to be an artifact
of voluntary attention or medication, although a number of nondisease factors are
known to affect SPEM. However, cigarette smoking has recently been reported to deteriorate
SPEM in both smokers and nonsmokers. This finding is particularly relevant to schizophrenia,
because schizophrenic patients smoke cigarettes considerably more than do normals,
and none of the previous studies in this patient group have controlled for smoking.
The current study was initiated to examine the effects of smoking on a number of oculomotor
measures, including SPEM in smoker and nonsmoker normal volunteers. The results of
this study suggest that cigarette smoking induces or significantly increases square-wave
jerks, especially during smooth pursuit in normals. However, the effect is small and
the global qualitative SPEM score is not affected. Other eye movements such as latencies
for reflex and volitional saccades and saccadic distractibility are also unaffected
by smoking. No differences were apparent between chronic smokers and nonsmokers under
nonsmoking conditions in any of the eye-movement measures.
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Article info
Publication history
Received in revised form:
July 2,
1990
Received:
November 25,
1989
Identification
Copyright
© 1991 Published by Elsevier Inc.