2013年7月24日水曜日

The Differential Effects of Reward on Space- and Object-Based Attentional Allocation

Jeongmi Lee and Sarah Shomstein
J. Neurosci. 2013;33 10625-10633
http://www.jneurosci.org/cgi/content/abstract/33/26/10625?etoc

ヒトfMRI。
「注意」と「報酬」の相互作用。
「モノへの注意」と「場所への注意」に対応する脳活動はそれぞれ異なったやり方で「報酬の情報(価値)」にモジュレートされる。

Estimating reward contingencies and allocating attentional resources to a subset of relevant information are the most important contributors to increasing adaptability of an organism. Although recent evidence suggests that reward- and attention-based guidance recruits overlapping cortical regions and has similar effects on sensory responses, the exact nature of the relationship between the two remains elusive. Here, using event-related fMRI on human participants, we contrasted the effects of reward on space- and object-based selection in the same experimental setting. Reward was either distributed randomly or biased a particular object. Behavioral and neuroimaging results show that space- and object-based attention is influenced by reward differentially. Space-based attentional allocation is mandatory, integrating reward information over time, whereas object-based attentional allocation is a default setting that is completely replaced by the reward signal. Nonadditivity of the effects of reward and object-based attention was observed consistently at multiple levels of analysis in early visual areas as well as in control regions. These results provide strong evidence that space- and object-based allocation are two independent attentional mechanisms, and suggest that reward serves to constrain attentional selection.

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