初级视觉皮层中的感觉表征不足以产生主观想象。

IF 8.1 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Current Biology Pub Date : 2024-11-04 Epub Date: 2024-10-16 DOI:10.1016/j.cub.2024.09.062
Giulia Cabbai, Chris Racey, Julia Simner, Carla Dance, Jamie Ward, Sophie Forster
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引用次数: 0

摘要

心理意象的当代定义有两个方面的特点:一是类似于知觉但并非由知觉产生的感觉表象,二是相关的主观体验。神经影像学显示,初级视觉皮层(V1)中与意象相关的感觉表征与知觉惊人地相似。然而,这些表征是否总是反映主观体验,或者是否能与主观体验分离,目前仍不清楚。为了解决这个问题,我们比较了视觉化者和幻觉者(后者体验意象的能力受损)的感觉表征和主观意象。重要的是,为了测试感觉表征是否独立于按需产生意象的能力之外,我们研究了自发和自愿的意象形式。通过使用多变量 fMRI,我们测试了 V1 中的可解码感觉表征和主观视觉意象报告,这些报告要么是自发产生的(在被动聆听诱发性声音时),要么是在响应指示自愿产生声音内容的意象时产生的(始终在扫描仪内蒙住眼睛)。在幻听者中,V1对声音内容的解码在自愿意象过程中处于偶然状态,并且低于可视化者,但在被动聆听过程中却成功了,尽管他们报告说没有意象。与此相反,在视听者中,自愿意象比自发意象的 V1 解码准确率更高(同时与报告的两种意象的生动程度呈正相关)。最后,在这两种情况下,前楔状体的解码对视知者都是成功的,但对象知者则是偶然的。总之,我们的研究结果表明,V1 表征可以与主观想象分离,同时暗示了楔前肌在后者中的关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sensory representations in primary visual cortex are not sufficient for subjective imagery.

The contemporary definition of mental imagery is characterized by two aspects: a sensory representation that resembles, but does not result from, perception, and an associated subjective experience. Neuroimaging demonstrated imagery-related sensory representations in primary visual cortex (V1) that show striking parallels to perception. However, it remains unclear whether these representations always reflect subjective experience or if they can be dissociated from it. We addressed this question by comparing sensory representations and subjective imagery among visualizers and aphantasics, the latter with an impaired ability to experience imagery. Importantly, to test for the presence of sensory representations independently of the ability to generate imagery on demand, we examined both spontaneous and voluntary imagery forms. Using multivariate fMRI, we tested for decodable sensory representations in V1 and subjective visual imagery reports that occurred either spontaneously (during passive listening of evocative sounds) or in response to the instruction to voluntarily generate imagery of the sound content (always while blindfolded inside the scanner). Among aphantasics, V1 decoding of sound content was at chance during voluntary imagery, and lower than in visualizers, but it succeeded during passive listening, despite them reporting no imagery. In contrast, in visualizers, decoding accuracy in V1 was greater in voluntary than spontaneous imagery (while being positively associated with the reported vividness of both imagery types). Finally, for both conditions, decoding in precuneus was successful in visualizers but at chance for aphantasics. Together, our findings show that V1 representations can be dissociated from subjective imagery, while implicating a key role of precuneus in the latter.

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来源期刊
Current Biology
Current Biology 生物-生化与分子生物学
CiteScore
11.80
自引率
2.20%
发文量
869
审稿时长
46 days
期刊介绍: Current Biology is a comprehensive journal that showcases original research in various disciplines of biology. It provides a platform for scientists to disseminate their groundbreaking findings and promotes interdisciplinary communication. The journal publishes articles of general interest, encompassing diverse fields of biology. Moreover, it offers accessible editorial pieces that are specifically designed to enlighten non-specialist readers.
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