Lecture 26--visual thalamus & cortex I

Lecture 26--visual thalamus & cortex I - Ganglion...

Info iconThis preview shows pages 1–8. 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

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: Ganglion cells code contrast Contrast the difference in brightness between the center and the surround Small receptive field (fine spatial resolution) Tend to be foveal Color coding Large receptive field (poor spatial resolution) Tend to be peripheral Black/white coding R+G+B or Receptive fields of P cells Receptive fields of M cells R + G + B R + G + B Receptive field size Receptive field size increases with eccentricity (distance from the fovea) Receptive field size depends on: The size of photoreceptors that provide input to the ganglion cell The number of photoreceptors that provide input to the ganglion cell (convergence) Retina Rods operate under dim illumination; are color blind Cones operate under bright illumination Three cone types; mediate color perception Fovea high resolution area Contains high density of cones, no rods Ganglion cells provide the output from the retina Ganglion cells use center surround organization to encode stimulus contrast Two receptive field types: On-center off-surround or Off-center on- surround Receptive field size increases with distance from fovea Two types of ganglion cells: M and P Differ in receptive field size and type of cone input Retinal function can be divided into a day/night system and a fovea/periphery system....
View Full Document

Page1 / 38

Lecture 26--visual thalamus & cortex I - Ganglion...

This preview shows document pages 1 - 8. Sign up to view the full document.

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