Department of Experimental Psychology, University of Oxford, Oxford, UK.
Neuroimage. 2013 Jan 1;64:590-600. doi: 10.1016/j.neuroimage.2012.09.003. Epub 2012 Sep 7.
A large corpus of data has demonstrated the sensitivity of behavioral and neural measures to variation in the availability of reward. The present study aimed to extend this work by exploring reward motivation in an RSVP task using complex satellite imagery. We found that reward motivation significantly influenced neural activity both in the preparatory period and in response to target images. Pre-stimulus alpha activity and, to a lesser degree, P3 and CNV amplitude were found to be significantly predictive of reward condition on single trials. Target-locked P3 amplitude was modulated both by reward condition and by variation in target detectability inherent to our task. We further quantified this exogenous influence, showing that P3 differences reflected single-trial variation in P3 amplitude for different targets. These findings provide theoretical insight into the neural indices of reward in an RSVP task, and have important applications in the field of satellite imagery analysis.
大量数据表明，行为和神经测量对奖励可得性的变化敏感。本研究旨在通过使用复杂的卫星图像来扩展这项工作，探索 RSVP 任务中的奖励动机。我们发现，奖励动机在准备期和对目标图像的反应中都显著影响神经活动。在单个试验中，发现刺激前的阿尔法活动以及程度较轻的 P3 和 CNV 幅度，都能显著预测奖励条件。目标锁定的 P3 幅度受到奖励条件和我们任务中固有的目标可检测性变化的双重调节。我们进一步量化了这种外源性影响，表明 P3 差异反映了不同目标的 P3 幅度的单个试验变化。这些发现为 RSVP 任务中的奖励神经指标提供了理论见解，并在卫星图像分析领域具有重要应用。
