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Two distinct modes of sensory processing observed in monkey primary visual cortex (V1)

Abstract

Even salient sensory stimuli are sometimes not detected. What goes wrong in the brain in that case? Here we show that a late (> 100-ms) component of the neural activity in the primary visual cortex of the monkey is selectively suppressed when stimuli are not seen. As there is evidence that this activity depends on feedback from extrastriate areas, these findings suggest a specific role for recurrent processing when stimuli are reaching a perceptual level. Further results show that this perceptual level is situated between purely sensory and decision or motor stages of processing.

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Figure 1: Figure–ground display and sequence of visual stimulation.
Figure 2: Eye movements.
Figure 3: Receptive fields, stimuli and neural responses.
Figure 4: `Seen' versus `not seen' neural responses.
Figure 5: Different line lengths, perceptual saliency and contextual modulation.
Figure 6: `Seen' versus `not seen' neural responses for different levels of stimulus saliency.
Figure 7: Model and supporting evidence of stimulus and decision processing in the visual system, showing two distinct modes of sensory processing.

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Acknowledgements

We thank P. Brassinga, H. Meester, J. de Feiter and K. Brandsma for technical support. We thank C. Koch, M. Regan, P. Roelfsema, J. Schall and M. Shadlen for their comments on earlier versions of this paper. H. Supèr is supported by a grant from Medical Sciences (MW), which is subsidized by the Netherlands Organization for Scientific Research (NWO).

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Correspondence to Victor A. F. Lamme.

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Supèr, H., Spekreijse, H. & Lamme, V. Two distinct modes of sensory processing observed in monkey primary visual cortex (V1). Nat Neurosci 4, 304–310 (2001). https://doi.org/10.1038/85170

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