Parent-victim agreement in adolescent suicide research |
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Authors: | DM Velting D Shaffer MS Gould R Garfinkel P Fisher M Davies |
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Affiliation: | Max-Planck-Institut für biologische Kybernetik, Tübingen, Germany. thomas.kammer@tuebingen.mpg.de |
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Abstract: | It is known that transcranial magnetic stimulation (TMS) administered over the occipital pole suppresses recognition of visual objects. Our aim was to ascertain whether this suppression can be interpreted as a change in visual contrast threshold. Four subjects detected the orientation of an U-shaped hook flashed for 21 ms. Under control conditions, mean contrast threshold was found at 0.88 log units Weber contrast. Thresholds were raised if TMS was applied 40-200 ms after the visual stimulus. Maximum elevation was 1.67 log units under TMS at 120 ms stimulus onset asynchrony. This phenomenon can be interpreted as a reduction in signal-to-noise ratio of the visual stimuli by TMS, which can be compensated for by increasing the contrast of the stimuli. |
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