Selective activation of human cortical area V5A by a rotating visual stimulus in fMRI; implication of attentional mechanisms
作者:
Bernhard Haug,
Jürgen Baudewig,
Walter Paulus,
期刊:
NeuroReport
(OVID Available online 1998)
卷期:
Volume 9,
issue 4
页码: 611-614
ISSN:0959-4965
年代: 1998
出版商: OVID
关键词: Area V5A;Attention;Cross-modality task;fMRI;MST;Rotation;Visual motion
数据来源: OVID
摘要:
THE human homologue of area V5A of rotation–selective cells in the monkey medial superior temporal area (MST) was identified using functional magnetic resonance imaging (fMRI). It was located within the border region of occipito-temporo-parietal cortex, in four of 10 subjects on both sides, and on the right or left side in three subjects each. The stimulus was a black-and-white sine-modulated windmill presented either stationary or in rotation phases of s duration. Areas V1–V3 did not show up with this paradigm. Focusing attention by mentally counting the number of rotation phases ensured high signal intensity in V5A, whereas moving attention away by counting electric stimuli to the wrist diminished it despite persistent fixation of gaze to the centre of the windmill.
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