Widespread fMRI activity differences between perceptual states in visual rivalry are correlated with differences in observer biases
| العنوان: | Widespread fMRI activity differences between perceptual states in visual rivalry are correlated with differences in observer biases |
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| المؤلفون: | R. van Ee, R.J.A. van Wezel, Mathijs Raemaekers, M.E. van der Schaaf |
| المصدر: | Brain Research, 1252, 1252, pp. 161-171 Brain Research, 1252, 161-171 |
| بيانات النشر: | Elsevier BV, 2009. |
| سنة النشر: | 2009 |
| مصطلحات موضوعية: | Male, medicine.medical_specialty, genetic structures, media_common.quotation_subject, Posterior parietal cortex, Stimulus (physiology), Audiology, Developmental psychology, Perception, Perception and Action [DCN 1], medicine, Humans, Molecular Biology, media_common, Observer Variation, Brain Mapping, Supplementary motor area, Optical Illusions, General Neuroscience, Brain, Observer (special relativity), Magnetic Resonance Imaging, Dorsolateral prefrontal cortex, medicine.anatomical_structure, Multivariate Analysis, Visual Perception, Female, Neurology (clinical), Percept, Psychology, 170 000 Motivational & Cognitive Control, Insula, Algorithms, Developmental Biology |
| الوصف: | When observing bistable stimuli, the percept can change in the absence of changes in the stimulus itself. When intermittently presenting a bistable stimulus, the number of perceptual alternations can increase or decrease, depending on the duration of the period that the stimulus is removed from screen between stimulus presentations (off-period). Longer off-periods lead to stabilization of the percept, while short off-periods produce perceptual alternations. Here we compare fMRI brain activation across percept repetitions and alternations when observing an intermittently presented ambiguously rotating structure from motion sphere. In the first experimental session, subjects were requested to voluntarily control the percept into either a repeating or an alternating perceptual regime at a single off-period. In a consecutive session, subjects observed the sphere uninstructed, and reported alternations and repetitions. The behavioral data showed that there were marked individual biases for observing the sphere as either repeating or alternating. The fMRI data showed activation differences between alternating and repeating perceptual regimes in an extensive network that included parietal cortex, dorsal premotor area, dorsolateral prefrontal cortex, supplementary motor area, insula, and cerebellum. However, these activation differences could all be explained by intersubject differences in the bias for one of the two perceptual regimes. The stronger the bias was for a particular perceptual regime, the less activation and vice versa. We conclude that widespread activation differences between perceptual regimes can be accounted for by differences in the perceptual bias for one of the two regimes. |
| وصف الملف: | application/pdf |
| تدمد: | 0006-8993 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b06e6daf182a29d33afbdfd0f7b1b530 https://doi.org/10.1016/j.brainres.2008.11.078 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....b06e6daf182a29d33afbdfd0f7b1b530 |
| قاعدة البيانات: | OpenAIRE |
Full Text via ClinicalKey | تدمد: | 00068993 |
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