10_Up_to_consciousness

Small arrows the interactions among them large arrows

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Unformatted text preview: . Large arrows: the orientation of top-down attention to the stimulus, or away from it (‘task-unrelated attention’). Dashed curves: a continuum of states. Thick lines with separators: a sharp transition between states. During subliminal processing, activation propagates but remains weak and quickly dissipating. “Consciousness”: an approach trough visual neuroscience During preconscious processing, activation can be strong, durable, and can spread to multiple specialized sensori-motor areas. When attention is oriented away from the stimulus (large black arrows), activation is blocked from accessing higher areas and establishing long-distance synchrony. During conscious processing, activation invades a parieto-frontal system, can be maintained ad libidum in working memory, and becomes capable of guiding intentional actions including verbal reports. The transition between preconscious and conscious is sharp. 15 Consciousness and visual pathways V1 is necessary for conscious vision (cf cortical blindness). but, V1 is not sufficient for “conscious” vision (sensation). (V1 may be active in vegetative state) Consciousness and visual pathways Dorsal route: Unconscious Consciousness and visual pathways V5 (MT) Consciousness and visual pathways Potential actions Visual features Potential actions Visual features Ventral route: Conscious Recognition The classical view: dorsal ~ unconscious, ventral ~ conscious Neglect Recognition Neurology: neglect bridging the dorsal and ventral streams 16 Consciousness and visual pathways OFC orbitofrontal cortex IT inferior temporal cortex LSF low spatial frequency V1 Potential actions Visual features Attention Recognition Neurological view: attention as a bridge between Consciousness and visual pathways • No single area, pathway or locality appears to be the neural correlate for (visual) consciousness. Adapted from Journal of Cognitive Neuroscience 2003, 15, 600-9 -A partially analyzed version of the input image (V1) (i.e., a blurred image) is projected rapidly from ea...
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