Neural mechanisms of unconscious visual motion priming |
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Authors: | Yuejia Luo Yang Jiang Yiyuan Tang R Parasuraman |
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Institution: | (1) Institute of Psychology, Chinese Academy of Sciences, 100101 Beijing, China;(2) National Institute of Mental Health, 20892 Bettesda, MD, USA;(3) Catholic University of America, 20064 Washington DC, USA |
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Abstract: | The neural correlates of the motion priming were examined in normal young subjects using event-related brain potentials (ERPs) and functional magnetic resonance imaging (fMRI). Visual motion perception can be uncon-sciously biased in favor of a particular direction by a pre-ceding motion in that direction. Motion priming first in-volved an enhancement of ERP amplitude about 100 ms fol-lowing the onset of motion. The amplitudes of ERP compo-nents after 350 ms were also increased. The fMRI results suggest that the early-latency effect reflects modulation of neural responses in extrastriate cortex. Higher-level visual processing areas, including cortical regions MT/MST and the intraparietal cortices were also activated. The findings provide direct evidence that unconscious priming of motion perception is the result of interaction of direction-selective neural responses to motion stimuli. The results cannot be accounted for by refractoriness of neural responses, but in-stead support a theory of motion priming based on motion opponency, as proposed in computational models. |
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Keywords: | visual motion unconsciousness event-related potential functional MRI |
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