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Feature-based attention

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Presentation on theme: "Feature-based attention"— Presentation transcript:

1 Feature-based attention

2 Feature-based attention

3 Global Spread: Neurophysiology
Neural responses are modulated by features of distant attended stimuli (e.g., Treue & Martinez-Trujillo, 2004; Saenz et al, 2002; Boynton & Serences, 2007) Receptive Field Attended dots Neurons that prefer the attended feature value are ‘boosted’ across the visual field, even at task-irrelevant locations

4 Some studies have suggested that location has priority over other features in visual selection.
No direct comparison between spatial and feature-based attention due to differences and tasks employed

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9 With identical stimuli and tasks:
Spatial attention affects the selection process earlier than feature-based attention Given sufficient time between the cue and target, feature-based attention can be as effective as spatial attention Liu, Stevens & Carrasco, Vis.Res. 07

10 Equivalent noise curves
Neural population response Equivalent noise curves

11 External noise with global motion

12 Sequence of events in a single trial

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14 Feature-based attention at a peripheral location

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16 Attentional filters gain= 1.77 -1 gain= 1.44 slope=.0032 deg

17 How attention modulates population response
Ling, Liu & Carrasco, Vis Res 09

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