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Identifier 000404072
Title Αξιολόγηση οπτικής και στρατηγικής επεξεργασίας σε συνθήκες άγχους
Alternative Title Evaluation of optical and stratigecal processes under threat
Author Λαρετζάκη, Τζούλια
Thesis advisor Μπίτσιος, Παναγιώτης
Reviewer Παλλήκαρης, Ιωάννης
Τσιλιμπάρης, Μιλτιάδης
Πλαίνης, Σωτήρης
Θερμού, Κυριακή
Σπανάκη, Κλειώ
Παναγιώτης, Σίμος
Γιακουμάκη, Στέλλα
Abstract Threat cues activate the visual cortex and are detected faster than neutral cues as evidenced by functional brain imaging during viewing of visual threat and neutral stimuli. Pattern visual evoked potentials were elicited in a baseline and a verbal threat condition with two stimulus contrasts in subjects with high and low trait anxiety. Threat reduced the latency of the early P100 wave in the low but not the high anxious group. The reduction was greater with increasing stimulus contrasts. The dependence of the P100 latency on trait anxiety is reminiscent of the Yerkes-Dodson inverted U-shape curve, which relates anxiety to behavioural responses. These results show that threat affects perceptual processes and suggest that data based on the effects of threat in visual search studies should be reappraised to include acceleration of contrast perception. Threat accelerates early visual information processing, as shown by shorter P100 latencies of pattern Visual Evoked Potentials in subjects with low trait anxiety, but the opposite is true for high anxious subjects. We sought to determine if, and how, threat and trait anxiety interact to affect stability of gaze fixation. We used video oculography to record gaze position in the presence and in the absence of a fixational stimulus, in a safe and a verbal threat condition in subjects characterised for their trait anxiety. Trait anxiety significantly predicted fixational instability in the threat condition. Fixation was less stable in the high anxiety group, especially under threat or in the absence of a stimulus. The effects of anxiety extend to perceptual and sensorimotor processes. These results have implications for the understanding of individual differences in occulomotor planning and visually guided behavior.
Language Greek, English
Subject Trait anxiety
Visual evoked potentials
Σχιζοτυπία
Υγιείς εθελοντές
Χαρακτηρολογικό άγχος
Χρόνος απόκισης P100
Issue date 2016-12-13
Collection   School/Department--School of Medicine--Department of Medicine--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/e/3/0/metadata-dlib-1482397932-29857-6722.tkl Bookmark and Share
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