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Lecture 8

Lecture 8 – PSYB51.docx

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Matthias Neimier

Lecture 8 – PSYB51 Models of Attention Scene perceptions:  Similar in dimensions  Castle: when you look closely at that picture, it’s not the same, but from far away they look the same  Spatial frequencies  Natural scenes look systematically different than human-made scenes (clean shapes, walls, corners, etc.)  Openness-> how much is your view restricted of the left and right side (ex. a street vs. looking at the ocean from the beach)  Depth of a scene (2D or 3D?)  Selective attention is...a cognitive brain mechanism that enables one to process relevant inputs, thoughts, or actions while ignoring others that are less important, irrelevant or distracting.  Attention is not...arousal: a global state of the brain reflecting an overall level of responsiveness. (Also known as affect intensity in the context of emotions.) Today: attentional control and models of attention • Models of attention
 • Networks of attentional control • Disorders of attention Early vs. late selection (the amount of synapses it takes to drive a neuron ex. neuron and LGN cells) Early selection or early with adaptable filter system. Late selection o Even semantic processes can remain unattended/ unconscious Multi-level filtering : everything is possible in the end Perceptual load : depending how difficult a task it, that will modulate how much processing occurs Contraction of muscle means you show some kind of behavior  “Spotlight”(or search light) model: attention is confined to a coherent region of space and can move from one point to the next.  “Zoomlens” model: attention expands from fixation... grows to fill whole region...shrinks to include just cued location  Problems with spotlight and zoom lens models: 1. Attention shifts rather instantly. 2. Attention can split into more than one focus; not necessarily coherent region in space. -> it can’t explain object tracking – e.g., fMRI experiment -- e.g., multiple object tracking Left hemisphere of cortex -> attention 2-> V1 and V2: here you would have the activity for the bottom right corner The RSVP in the top left corner is activated in Attention 2 bottom cortex Lower left RSVP is associated with top right cortex (Attention 1) Upper right RSVP is associated with bottom left cortex The cen
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