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Title of Journal: Exp Brain Res

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Abbravation: Experimental Brain Research

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Springer-Verlag

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1432-1106

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Active eye fixation performance in 940 young men

Authors: N Smyrnis E Kattoulas I Evdokimidis N C Stefanis D Avramopoulos G Pantes C Theleritis C N Stefanis
Publish Date: 2003/12/19
Volume: 156, Issue: 1, Pages: 1-10
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Abstract

A total of 940 young men performed a task in which they actively maintained fixation for 50 s in three conditions a on a visual target b on a visual target while distracting targets appeared briefly on the periphery and c with no visual target present The same individuals completed psychometric evaluation tests measuring IQ schizotypy and current statedependent psychopathology The proportion of fixation time decreased and saccade frequency increased in condition b compared wih condition a and sequentially in condition c compared with condition b A trend towards a decrease in proportion of fixation time and increase in saccade frequency was found as the subjects maintained fixation during the task and this timedependent deterioration of performance was again most pronounced in condition c less so in condition b and absent in condition a Psychometric test scores were significantly correlated with fixation performance in the population Worse performance in all three fixation conditions was observed for individuals with lower IQ scores A deterioration of fixation performance with time in condition b was correlated with disorganization characteristics of schizotypy suggesting that these individuals had difficulty maintaining active fixation in the presence of increased inhibitory load A connection of such a difficulty with the frontal lobes and their role in the control of voluntary inhibitory functions is discussedThis work was supported by the grant “EKBAN 97” to Professor CN Stefanis from the General Secretariat of Research and Technology of the Greek Ministry of Development The technical support for this project was provided by Intrasoft Co We would like to thank the commanders in chief and the military personnel of the “124” Base for Basic Training of the Hellenic Air Force A preliminary report on this work was presented in the Society for Neuroscience meeting 2000

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