101_12AI_neuro_9-visual_system

101_12AI_neuro_9-visual_system - luminance contrast size...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: luminance contrast size edge color flicker motion direction orientation texture depth intensity wavelength spatio-temporal changes orient head & eyes to track moving objects image stabilization during self-motion pupillary light reflex reset circadian rhythms other brain regions (amygdala, brainstem, ......) visual system Fig 6-31 Van Essen 92 Science 255: 419 Fig 6-11 ~30 hrs lecture 1) how do photoreceptors respond to light? 2) how do photoreceptors generate spikes in your optic nerve? 3) how do you see over a broad range of light intensities? 4) how do you see fine details? 5) how do you see different properties of visual objects? eye viewed like a camera 1) aperture: iris & pupil 2) lens: cornea (primary) & lens (for objects closer than 20 ft) 3) adjustable focus: ciliary muscle (accommodation) 4) film: retina ( 2-D map of a 3-D world ) 5) camera body: sclera & other opaque tissue behind retina 6) shutter speed: integration time of photoreceptors Fig 6-11 Cuenca Fig 6-23 how does retina report light & dark to brain? darkness depolarizes photoreceptors then... photoreceptor E m time fash oF light bipolar E m time ganglion cell spikes time this leads to disinhibition of some bipolar cells...
View Full Document

This note was uploaded on 04/05/2012 for the course NPB 101 taught by Professor Fuller,charles/goldberg,jack during the Spring '08 term at UC Davis.

Page1 / 18

101_12AI_neuro_9-visual_system - luminance contrast size...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online