Rhythm-based Brain Information Processing Unit, RIKEN BSI-TOYOTA Collaboration Center Saitama, Japan ; Laboratory for Advanced Brain Signal Processing, RIKEN Brain Science Institute Saitama, Japan.
Front Hum Neurosci. 2012 Nov 27;6:318. doi: 10.3389/fnhum.2012.00318. eCollection 2012.
Subjective preferences affect many processes, including motivation, along with individual differences. Although incentive motivations are proposed to increase our limited visual working memory (VWM) capacity, much less is known about the effects of subjective preferences on VWM-related brain systems, such as the prefrontal and parietal cortices. Here, we investigate the differences in VWM capacities and brain activities during presentation of preferred and non-preferred colors. To this end, we used time-frequency (TF) analyses of electroencephalograph (EEG) data recorded during a delayed-response task. Behavioral results showed that the individual VWM capacities of preferred colors were significantly higher than those of non-preferred colors. The EEG results showed that the frontal theta and beta amplitudes for maintenance of preferred colors were higher than those of non-preferred colors. Interestingly, the frontal beta amplitudes were consistent with recent EEG recordings of the effects of reward on VWM systems, in that they were strongly and individually correlated with increasing VWM capacities from non-preferred to preferred colors. These results suggest that subjective preferences affect VWM systems in a similar manner to reward-incentive motivations.
主观偏好影响许多过程，包括动机以及个体差异。尽管激励动机被认为可以提高我们有限的视觉工作记忆（VWM）容量，但对于主观偏好对与 VWM 相关的大脑系统（如前额叶和顶叶皮层）的影响，我们知之甚少。在这里，我们研究了在呈现偏好颜色和非偏好颜色时 VWM 容量和大脑活动的差异。为此，我们使用了在延迟反应任务期间记录的脑电图（EEG）数据的时频（TF）分析。行为结果表明，偏好颜色的个体 VWM 容量明显高于非偏好颜色的个体。EEG 结果表明，维持偏好颜色的额部θ波和β波振幅高于非偏好颜色。有趣的是，额部β波振幅与最近关于奖励对 VWM 系统影响的 EEG 记录一致，因为它们与 VWM 容量从非偏好颜色到偏好颜色的增加呈强烈的个体相关性。这些结果表明，主观偏好以类似于奖励激励动机的方式影响 VWM 系统。
