Class Notes (1,100,000)
CA (620,000)
UTM (20,000)
PSY (4,000)
Lecture 4

PSY393H5 Lecture Notes - Lecture 4: Cerebral Cortex, Parietal Lobe, Temporal Lobe


Department
Psychology
Course Code
PSY393H5
Professor
Iva Zovkic
Lecture
4

This preview shows pages 1-2. to view the full 8 pages of the document.
Anatomical differences
-left hempishere extends farther back and wider in back compared to right
Right hemisphere exptends more forward and wider at the front it is slightly larger and heavier
Left contains more grey matter while right contains more white
Left lateral fissure more gently sloped while right lateral fissure extends further and turns up at
the end
Planum temporale – bigger on the left than the right
- Cortical area of the wernkices area
- Important for language comprehension
- Bigger in left than right
Occurs in pre term infant or children with dyslexia
Heschl’s gyrus
- Primary auditory cortex is slight smaller in the left than right
- Secondary auditory cortex is larger in left than right
- Important for decoding language
Anatomical differences in speech areas
- Dendrites cell bodies grey matter so left hemisphere more branching – more white
matter in the right so not as much branching
Focus: Brahcning order of dendrites
Dendritic order of branching –the very first branch 1st order dendrite primary branch it will branch
off further end up with secondary branching – 3 will branch off to 4 th and so on – wanted to test
will branching be different in the left hemisphere over the right
Anatomical differences in speech areas
- What do you notice? There is more branching in the left than right – more higher order
branching in the left
- Especially in region we know to be lateralized for function
Gene expression differences
- Perysylvian regions – just took areas around the sylivian –

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

- Essentially looked at genome expression what genes are expressed in left and right and
is there a differences
- Genes are differentially expressed chart clustered functionality of genes these 6 genes
that differ from the elft and right are cell division and etc
- There is some change between 12 and 14 but not so much – definetly shows there are
genes that are differentially expressed
Functional differences in the 2 hemispeheres
Right temporal cortex
-focus here because we know a lot of what the left does
Looked specifically at regions of language that are analogous in the left hemisphere eg
wernkies area in the left is it the same in the right
- Flat tone while speaking
Right parietal lobe
-what do these areas do when they are damaged in the right?
- hemi-spatial neglect – acknowledge one half of the picture – people ignore one side of their
space eg only eat things on one half of there plate
Prosopagnosia – ability to recognize someone
- Global/local distinctions – present patoients with stimuli global and local feratures and
how interpreted by other hemisphere
Left hemisphere lesion
- Z’s shaped by m
- Lesion in the left hemisphere what would you see ? when you have damaged to the left
only right is function the right is seeing the whole m and not the z’s so holistic processing
seems like right is able to do this when left is gone
- The left give the detail
Right hemisphere lesion
-see s it but missing the big picture left hemisphere loves big details
Global-local distinction extends to non-verbal stimuli
Non-linguistic global/local response
You're Reading a Preview

Unlock to view full version

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

-damage to left draw the triangle
Damage to right draw all the little bits
Assymeetry across frontal cortex
- Exeutive function hemisphere
Verbal fluency
- Generated fewer words
- What happens with c? rule breaking not sticking to 4 letters more than 4 these may be
things attributed to right hemisphere damage
Design flunecy
- Suffers from right frontal lesion
- We are looking for sign of perseveration – simple things over and over patient b -
- C- can be difficult for people to do things spontaneously may be able to do the same
thing if given instructions but something from nothing is hard
Other frontal asymmetries
- Response patterns – right frontal – don’t care
- Left frontal – damage - scared
- Anosognosia likey with reight lesions -
Hemisphereic specialization
Pathways to communication between the hemispheres
- Anterior commuissure – much smaller only at the front- additional fibre tract
- Posterior /hippocampal
Locations of main commissures
- Anterior because in small front areas
- Corpus callosume sapns decent oart of brain
Parts of the corpus callosum
- Genu frontal portion- light blue arrow fibres connection frontal regions red parietal
yellow temporal and saggital
- Rear is splenium
You're Reading a Preview

Unlock to view full version