Week 10 - Colour Vision

Light intensity is the waves:

Short wavelengths looks [blank_start]purple/blue[blank_end]. Medium wavelengths look [blank_start]green[blank_end]. Long wavelengths look [blank_start]red[blank_end].

Principle of Univariance: a receptors activity is related to the [blank_start]number[blank_end] of photons it catches, not to the [blank_start]types[blank_end] of photons.

Cone Types: Peak [blank_start]560[blank_end] = red. Peak [blank_start]530[blank_end] = green. Peak [blank_start]420[blank_end] = blue. [blank_start]Blue[blank_end] light is often blurred; few are in the fovea and they are more sparse.

[blank_start]Anomalous Trichromats[blank_end]: have 3 types of cone, but have a deficiency in one cone type. [blank_start]Dichromats[blank_end]: lack one cone type entirely. [blank_start]Monochromats[blank_end]: lack colour vision day & night. [blank_start]Cerebral Achromatopsia[blank_end]: damage to V4 area can cause complete "colour blindness".

Types of Anomalous Trichromats: [blank_start]Protanomaly[blank_end]: red/long cone. [blank_start]Deuteranomaly[blank_end]: green/medium cone. [blank_start]Tritanomaly[blank_end]: blue/short cone.

Types of Dichromats: [blank_start]Protanopia[blank_end]: red/long cone. [blank_start]Deuteranopia[blank_end]: green/medium cone. [blank_start]Tritanopia[blank_end]: blue/short cone.

Rod Monocromats have no cones at all.

Cells in the LGN and V1 show antagonistic cone inputs. Red/Green cells are [blank_start]Parvocellular[blank_end]. Blue/Yellow cells are [blank_start]Koniocellular[blank_end]. Black/White cells are [blank_start]Magnocellular[blank_end].

Cells in which area exhibit colour constancy?