how does vision in the periphery differ from vision in the fovea? course hero

Foveal vision is used for scrutinizing highly detailed objects, whereas peripheral vision is used for organizing the broad spatial scene and for seeing large objects. Our foveal vision is optimized for fine details, and our peripheral vision is optimized for coarser information. What is in the fovea?

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What is the difference between foveal and peripheral acuity?

Peripheral acuity •Peripheral acuity is worse than foveal acuity •e.g. a fixed letter size is harder to read in the far periphery vs. near to the fovea 12 E S A C U I T Y A T I O N F I X K N I F I C M A O C L A C I T R Anstis (1974) Peripheral acuity •Peripheral acuity is worse than foveal acuity

What do statistics tell us about crowding in peripheral vision?

•Summary statistics in peripheral vision give a sense of ‘richness’ in the face of limited resources 35 Context in fovea vs. periphery •Note that crowding differs from foveal processes like tilt contrast where differences are emphasised

What is the normal range of peripheral vision?

•Periphery: the rest •Extends ~60° above, ~80° below, and ~100-110° laterally •i.e. ~95-99% of vision is peripheral! 5 See e.g. Strasburger, Rentschler & Jüttner (2011) What limits peripheral vision? •What limits our peripheral vision? •Not just acuity (Anstis, 1974; Rosenholtz, 2016) 6

What is the function of the visual cortex?

•It occurs when visual information exceeds our processing capacity •i.e. it disrupts peripheral vision, which is under-sampled relative to the fovea (fewer photoreceptors, larger receptive fields, etc.) •Its operation is to simplify visual input