Electrophysiological evidence for a shared representational medium for visual images and visual percepts.
Electrophysiological evidence for a shared representational medium for visual images and visual percepts.
复制标题
DOI：
10.1037//0096-3445.117.3.248
复制
发表时间：
1988-09
期刊：
影响因子：
--
通讯作者：
M. Farah;F. Péronnet;M. Gonon;M. Giard
中科院分区：
文献类型：
--
作者：
M. Farah;F. Péronnet;M. Gonon;M. Giard
心理意象是否涉及视觉系统中表征的激活？意象对视觉信号检测表现的系统性影响被用于论证意象和刺激的感知处理在某些共同的活动位点相互作用（法拉，1985）。然而，这样的结果对于这种相互作用是否发生在刺激的特定模态视觉处理过程中这一问题是中立的。如果意象在刺激表征的早期、特定模态阶段影响刺激处理，这意味着共享的刺激表征是视觉的；而如果意象仅在刺激表征的后期、非模态阶段影响刺激处理，这意味着意象涉及更抽象的、视觉后刺激表征。为了区分这两种可能性，我们重复了早期的意象 - 感知相互作用实验，同时记录来自16个头皮电极对刺激的事件相关电位（ERPs）。通过观察意象对刺激的ERP影响的时间进程和头皮分布，我们可以对意象和感知的共享表征位点加以限制。在意象对刺激的ERP影响中，在刺激呈现后的200毫秒内，在视觉ERP的第一个负向成分的潜伏期，位于头皮的枕叶和后颞叶区域，即直接在视觉皮层上方，观察到了意象的影响。这一发现为心理意象在视觉系统本身中与知觉相互作用，因而心理意象本身是视觉表征这一论断提供了支持。
Does mental imagery involve the activation of representations in the visual system? Systematic effects of imagery on visual signal detection performance have been used to argue that imagery and the perceptual processing of stimuli interact at some common locus of activity (Farah, 1985). However, such a result is neutral with respect to the question of whether the interaction occurs during modality-specific visual processing of the stimulus. If imagery affects stimulus processing at early, modality-specific stages of stimulus representation, this implies that the shared stimulus representations are visual, whereas if imagery affects stimulus processing only at later, amodal stages of stimulus representation, this implies that imagery involves more abstract, postvisual stimulus representations. To distinguish between these two possibilities, we repeated the earlier imagery-perception interaction experiment while recording event-related potentials (ERPs) to stimuli from 16 scalp electrodes. By observing the time course and scalp distribution of the effect of imagery on the ERP to stimuli, we can put constraints on the locus of the shared representations for imagery and perception. An effect of imagery was seen within 200 ms following stimulus presentation, at the latency of the first negative component of the visual ERP, localized at the occipital and posterior temporal regions of the scalp, that is, directly over visual cortex. This finding provides support for the claim that mental images interact with percepts in the visual system proper and hence that mental images are themselves visual representations.