Probability cuing of target location facilitates visual search implicitly in normal participants and patients with hemispatial neglect
Probability cuing of target location facilitates visual search implicitly in normal participants and patients with hemispatial neglect
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DOI：
10.1111/1467-9280.00491
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发表时间：
2002-11-01
影响因子：
8.2
通讯作者：
Behrmann, M
中科院分区：
文献类型：
--
作者：
Geng, JJ;Behrmann, M
我们探讨了目标位置的概率的变化如何影响正常人和半侧空间忽视患者的视觉搜索，半侧空间忽视是一种在空间的对侧损伤方面的缺陷。年轻人和老年人正常的参与者反应更快时，目标出现在更可能的区域比当目标出现在不太可能的区域。同样，患者对靶点的分布也很敏感，即使是在被忽视的领域。虽然注意力梯度忽视的特点是没有被淘汰，由于概率分布的反应促进成比例的控制参与者和整个被忽视的领域的大小相等。所有参与者都利用目标的不均匀分布来提高任务绩效，而没有明确的指示或意识到他们的行为中的偏见。这些结果表明，注意定向和对外部概率的敏感性可能是分离的。早期的感觉和后期的运动机制被假定为可能参与观察到的概率匹配行为的参与者。
We explored how variability in the probability of target locations affects visual search in normal individuals and in patients with hemispatial neglect, a deficit in attending to the contralesional side of space. Young and elderly normal participants responded faster when targets appeared in the more probable region than when targets appeared in the less probable region. Similarly, patients were sensitive to the distribution of targets, even in the neglected field. Although the attentional gradient that characterizes neglect was not eliminated, the response facilitation due to the probability distribution was proportionate to that of control participants and equal in magnitude across the neglected field. All participants exploited the uneven distribution of targets to enhance task performance without explicit instructions to do so or awareness of biases in their behavior. These results suggest that attentional orientation and sensitivity, to external probabilities are possibly dissociable. An early sensory and a late motor mechanism are postulated as possibly being involved in the observed probability-matching behavior of participants.