The relationship between task performance and functional magnetic resonance imaging response
The relationship between task performance and functional magnetic resonance imaging response
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DOI：
10.1523/jneurosci.4476-04.2005
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发表时间：
2005-03-23
影响因子：
5.3
通讯作者：
Boynton, GM
中科院分区：
文献类型：
--
作者：
Buracas, GT;Fine, I;Boynton, GM
我们比较了速度和对比度辨别任务期间 V1 - V3 和 MT + 区域内的心理物理和功能磁共振成像 (fMRI) 反应。我们发现功能磁共振成像反应并不显着依赖于这些领域的任务。此外，对于各种对比度的速度和对比度辨别任务，V1 - V3 中的响应均大于 MT + 中的响应。这种结果模式表明，基于寻找那些对给定任务-刺激组合表现出比其他任务和刺激更大的活动的皮层区域来定位功能，在某些条件下可能会产生误导。然而，假设感知阈值取决于神经元群体反应的简单理想观察者模型确实成功地表明，V1 具有与受试者的对比辨别表现一致的神经元属性，并且 MT + 具有与受试者在速度辨别任务中的表现一致的神经元属性。
We compared psychophysical and functional magnetic resonance imaging ( fMRI) responses within areas V1 - V3 and MT + during both a speed and a contrast discrimination task. We found that fMRI responses did not depend significantly on task in any of these areas. Moreover, responses in V1 - V3 were larger than those in MT + for both the speed and the contrast discrimination tasks across a wide range of contrasts. This pattern of results demonstrates that localizing function based on finding those regions of cortex that show greater activity to a given task-stimulus combination than to other tasks and stimuli may, under certain conditions, be misleading. However, a simple ideal observer model assuming that perceptual thresholds are dependent on neuronal population responses does successfully show that V1 has neuronal properties consistent with our subjects' contrast discrimination performance, and that MT + has neuronal properties consistent with subjects' performance on a speed discrimination task.