Class Notes (1,100,000)
CA (620,000)
UBC (10,000)
PSYC (2,000)
Lecture

PSYC 367 Lecture Notes - Mach Bands, Receptive Field, Visual Cortex


Department
Psychology
Course Code
PSYC 367
Professor
James Hyman

This preview shows pages 1-2. to view the full 7 pages of the document.
I. The Lateral Geniculate Nucleus
1. Six Layers of LGN:
1) Lateral Geniculate Nucleus: A structure in the thalamus,
part of the midbrain, that receives input from the retinal ganglion
cells and has input and output connections to the visual cortex.

Only pages 1-2 are available for preview. Some parts have been intentionally blurred.

2) Think the six layers as 6 separate pathways.
3) Two different types of information:
Parvocellular layers: layer 14; receive input from P
Cells which are:
o smallersmaller receptive fields,
o important for color and fine detail;
o High correlation of activity between cone and p
cells, not perfect;
o make up about 80% of ganglion cells;
o receive input from single midget bipolar cells
from single cones in the central retina.
Magnocellular layers: layer 5 and 6; receive input
from M Cells which are:
o largerlarger receptive fields,
o important for low light vision and movement;
o High correlation of activity between rods and m
cells, not perfect (still some cones in M cells and
vise versa);
o make up about 10% of ganglion cells;
o receive input from diffuse bipolar cells from
hundreds rods spread out on one m cell (wider
area).
No M cells at fovea, increase as remove further from
fovea.
M cells and p cells response differently to stimuli:
o P cells response is slower and sustained; tonic
activity; the steady input allow to see fine detail.
o M cells response faster; fire a burst while
stimuli going on and off; no need to stay firing
to see movement; see contracts in dark light.
You're Reading a Preview

Unlock to view full version