Class Notes (810,488)
Canada (494,139)
Psychology (4,099)
PSY393H5 (32)
Lecture 5

lecture 5 - neuropsych.docx

5 Pages
Unlock Document

University of Toronto Mississauga
Mary Lou Smith

Early Perceptual Processing • Two Pathways o These pathways are named for the subcortical structures that the fibres go through as they are transversing from the retina (optic never) on to the visual cortex o The 2 subcortical structures are the:  Lateral geniculate nucleus (LGN) [genicolustriate]  visual cortex • LGN in the thalamus • Info first to the visual cortex  Superior colliculus (tectopulvinar pathway)  visual cortex  One eye goes to each of the above on way its way to the visual cortex  These pathways are responsible for different types of visual processing  Which eye does the right visual cortex receive info from? • Both! • Diagram – info from left visual and right visual cortex is being projected from both eyes • Left visual cortex receives info from both left and right eye and vice versa • Right visual cortex does receive information from the left visual FIELD • But visual field is not same as eye! o Because both eyes have access to the visual fields of both eyes • Midbrain or Mecsencephalon o Microscopic view of the LGN o Multiple layers (diff names for the layers that are dependent on location and the type of cells within those layers)  Magnocelluar layers – layer 1 and 2 • Responsible for motion detection  Parvocellular layers – layers 3, 4, 5, 6 • Important for processing color and fine detail  Koniocellular layer – inserted in between mano and parvo layers • Project to extra striding of areas in the cortex that important for processing color and detail  Diagram – 4 nuclei • Tectum (roof) o Of the midbrain • Pulvinar – from neuceleus o Part of thalamus o Pathway goes to superior collaiculus -> Pulvinar nucleus ->visual cortex  That info is processed in areas that are sensitive to head and eye movement  Pulvinar has another pathway to the brain stem! • Controls muscles of eyes (this pathway)  Pulvinar pathway is very imp for quick orientation for our stimuli (enables to see quickly) and also integrates auditory and visual information • Because a lot of the visual orienting that we do can also be in action to auditory stimulus • This pathway is also important for lower animal species like lizards, toads, which don’t really have acute vision, but very good at detecting movement • Diagram – breakdown of cortex o Different regions have diff cell types o Produced diff division acc to diff cell types o This is important because all of the territory of the visual cortex is unequal in terms of visual processing that it does • Primary Visual Cortex o Broadmanns area 17 o Area V1 – V for vision o More than 3 visual areas in terms of processing that is done by the neurons throughout the cortex o V1 – primary visual cortex  Why is it called “primary”? • They’re the first cortical place that gets the sensory information o Tectopulvinar pathway is in V1 for example o The genicolustriate pathway is also in the V1 • Also known as the “Striate” cortex (primary) o Because it looks striate • About 90% of the neurons that
More Less

Related notes for PSY393H5

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.