10_Up_to_consciousness

The parietal and frontal lobes jointly develop

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Unformatted text preview: l and frontal lobes jointly develop, monitor and refine the motor commands for intentional action. 3 Intention Intention arises as a direct consequence of pre-movement brain activity in the frontal and parietal motor areas. The supplementary motor area is a particularly important site for intention. Fried et al. J. Neurosci. 1991, 11, 3656-66 Intention The motor commmand on its own can produce the hallucination of movement When volunteers with an anaesthetised arm are asked to move their arm, they report the sense of movement. ⇒ The brain only has to send a command to a limb (intention) to create the sense of movement (i.e. a hallucination of movement) When the SMA is stimulated, subjects report the sensation of an urge to move their limb. More intense stimulation at the same locations provokes physical movements of the corresponding limb. Intention A pre-motor stimulation (SMA) can produce the sensation of an urge to move the limbs. J. Neurosci. 1991, 11, 3656–3666. The motor commmand on its own can produce the sense of movement. J Physiology, 2006, 571, 703-10 J. Physiology, 2006, 571:703-10 Hierarchy of action - Non-intentional: (reflexive) the lower system produces an action not set by the higher system - Intentional: higher system sets up the lower system. Intention: translates goals and desires into behavior. - absent-minded intentional action: (autonomous, automatic) action runs unmonitored. Action is appropriate to stimulus if appropriate conditions are met. - fully executive-controlled intentional action: (voluntary) higher system plans, triggers and monitors execution of action, overriding when necessary Adapted from Trends in Cognitive Sciences, 2005,9, No.6 June 4 From Sensation and Perception to Consciousness through Attention Multimodal Reflexive Automatic Voluntary Non-intentional Intentional, absent minded Intentional, fully controlled (Crevits, 2007) Attention ATTENTION PRE CONSCIOUS CONSCIOUS INATTENTION perception may proceed pre-consciously Attention Approximately 99% of all information entering through the senses is dropped (Wolfe, 2001) Factors that influence attention are meaning and emotion The process by which the brain - actively selects environmental information to pass on to higher levels of processing or - actively processes internal information (ie. visceral cues or thoughts). Mo...
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