Are recognition deficits following occipital lobe TMS explained by raised detection thresholds?

被引：47

作者：

Kammer, T ^{[1
]}

Nusseck, HG ^{[1
]}

机构：

[1] Max Planck Inst Biol Cybernet, D-72076 Tubingen, Germany

来源：

NEUROPSYCHOLOGIA | 1998年 / 36卷 / 11期

关键词：

transcranial magnetic stimulation; visual object recognition; contrast threshold; visual suppression; Weber contrast; signal-to-noise ratio;

D O I：

10.1016/S0028-3932(98)00003-7

中图分类号：

B84 [心理学]; C [社会科学总论]; Q98 [人类学];

学科分类号：

03 ; 0303 ; 030303 ; 04 ; 0402 ;

摘要：

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. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：1161 / 1166

页数：6

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