Attention to a spatial location spatial focus of

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Unformatted text preview: ttention 18 Selective Attention and Orienting !   attention to a spatial location / spatial focus of attention !   attention to colour or other non-spatial features independent of the focus of attention !   endogeneous / exogeneous (voluntary / stimulus-driven) !   enhanced visual processing !   visual orienting & eye movements 19 Overview ! ! ! ! ! ! ! ! Behavioral consequences of attention Selective attention and orienting Attention and eye movements Physiological effects of attention How is attention directed? Corbetta's DAN and VAN What is neglect? Body schema and awareness 20 Attention and eye movements !   Overt shifts of attention: A shift of attention accompanied by corresponding movements of the eyes. !   Covert shifts of attention: A shift of attention in the absence of corresponding movements of the eyes !   The same thing? 21 Attention and eye movements !   Premotor Theory of Attention (Rizzolatti) –  Attention is oriented to a given point when the oculomotor program for moving the eyes to this point is ready to be executed. –  Covert orienting of attention (w/o eye movements) is achieved by inhibiting the execution of the eye movement itself. 22 Attention and eye movements !   Attention & eye movements are closely coupled. Blue arrow: saccade should be performed to the blue patch. cueing of saccade target de Arrow disappears = go signal for saccade Digits better perceived at saccade target. f. sacc a Task 2: perceiving the digit that will appear at a known location. This location may or may not be the saccade target. perceptual task briefly flashed before saccade starts time be Task 1: saccade to one of the coloured patches as indicated by the coloured arrow in the centre. digits vanish before saccade 23 Attention and eye movements !   Shifting attention and eye movements employs largely overlapping frontoparietal networks, e.g., Corbetta et al. (1998). TOS: transversal occipital sulcus pIPS: posterior intraparietal sulcus aIPS: anterior … STS: superior temporal sulcus PrCes: precentral sulcus FO: frontal operculum 24 Attention and eye movements ! Kustov and Robinson (1996): Shared neural control of attentional shifts and eye movements in the superior colliculus. ! Microstimulations in SC above threshold: eye movements. !   Attention to saccade target lowers the threshold. saccade target location not attended sac...
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