PSYC105 Lecture Notes - Lecture 7: Outline Of Object Recognition, Motion Aftereffect, Lateral Inhibition
1 Jun 2018
School
Department
Course
Professor
Perception II
• Vision
• Eye
• Brain
• Visual processing
o Iris
o Pupil
o Cornea → transparent coating
o Neural signals from eye are interpreted by the brain
o Different forms of light
o Ligament
o Lens
o Ciliary muscle
o Sclera (the white of the eye)
o Retina
o Optic nerve
o Fovea/blind spot (back of the eye)
o Visual pathways:
▪ Frontal lobe
▪ Parietal lobe
▪ Occipital lobe
▪ Temporal lobe
▪ Lateral geniculate nucleus → deals with visual information
processing
▪ Inferior temporal cortex
▪ Cerebellum
o Information from the right side of space is processed in the left
hemisphere (and vice versa)
o This is made by the optic chiasm
o Lateralisation of processing with faces → some tasks are preferentially
performed in the left or right hemispheres
o Visual processing – the retina
▪ The retina is a network of neurons covering the back of the eye
▪ Light has to pass through a lot of neurons before it reaches the
receptors (rods & cones)
o Rods and cones:
▪ Rods and cones both convert light energy into neural signals
▪ But because of chemical properties of the pigments in them
(the bits that absorb the light)
▪ Rods work better in low light levels
▪ Cones work better in high light levels
o Blind spot:
▪ Where the optic nerve leaves the eye there are no
photoreceptors.
o Sensitivity vs. resolution:
▪ One reason the rod system is more sensitive than the cone
system is that individual rods are more sensitive than individual
cones
▪ But there is also more neural convergence in the rod system
find more resources at oneclass.com
find more resources at oneclass.com
