10_Up_to_consciousness

A non zero conscious level indicates the presence of

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Unformatted text preview: ates the presence of some conscious content. Cell Press 2008, in press, doi:10.1016/j.tics.2008.04.008 9 Consciousness: (three) necessary brain structures Primary consciousness: (sensory consciousness) conscious content consisting of a multimodal scene composed of basic perceptual and motor events. Higher-order consciousness: refers to awareness of being in a mental state. In humans it is usually associated with language and an explicit sense of selfhood. In higher-order theories, it is possible to have higher-order thoughts that are not themselves (higher-order) conscious, but in virtue of which other (primary) contents are conscious. cortex (awareness) (sensory relais selective attention) (ARAS; NOR, Dopamine) (arousal) Cell Press 2008, in press, doi:10.1016/j.tics.2008.04.008 Consciousness: a modular view Consciousness: network (conceptual view) Attention 10 Consciousness: network (neurological basis) Consciousness: network (neurolobiogical theories) 1. Thalamo-cortical network (sensorial information to cortex) 2. Cortico-subcortical loops (polysynaptic) 3. Projections from brainstem to cortex (the “ancient” neurotransmission) Consciousness: network cortices cortex Some neurobiological challenges (ARAS) Crevits, 2005 11 A chimere: ½ self-face ½ Clinton face Some neurobiological challenges The right hemisphere is critical for the sense of self Comparision of viewing the self-face, with viewing the face of Bill Clinton. If the right hemisphere is anesthetized, the subject sees Clinton, not himselve. When the left hemisphere anesthetized, the subject still recognizes his own face. Emotion and consciousness Some authors argue that emotion consists of - an emotional state - as well as feelings (the conscious experience of the emotion) Analogous to consciousness that consists of - level (e.g. coma, vegetative state); arousal, wakefulness - and content (what it is we are conscious of); awareness. Some neurobiological challenges Not only is consciousness important to aspects of emotion, but structures that are important for emotion (brainstem nuclei and midline cortex), overlap with those that regulate the level of consciousness. Trends in Cogn Sc 2007, 11, 158-67 12 The Libet et a...
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