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NESC 3227 (19)
Kim Good (19)
Lecture

January 17th, 2013.docx

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Department
Neuroscience
Course
NESC 3227
Professor
Kim Good
Semester
Winter

Description
January 17th, 2013 January-17-13 1:01 PM Sex differences in the brain parts: Planum Temporale  Have been studies to look at if the Planum Temporale is different between genders o Results show that women tend to be more likely to show reverse pattern (right bigger than left)  Meta-analytical study done on about 13 studies showed there actually weren't any sex related differences in terms of laterality  One study showed that women usually have areas larger which are involved in language production and comprehension Sex differences in connections: Corpus callosum  Size of callosum compared showed that it was larger in men  But the splenium (posterior end) of the callosum in women tended to have a different shape (more bulbous)  *could this increase in callosum size have to do with the known fact that men have larger brains? How do you measure cc?  Do you use absolute size or relative size? Sex differences in corpus callosum  Meta-analytical studies showed that there's a lot of methodological variability o Results differed depending on whether measurements were absolute or proportional o An absolute measure says that men have a larger cc o But if you use a proportional measure, women have a larger cc  This meta-analysis says the shape of the splenium doesn't differ between sexes Summary of sex differences in neuroanatomy  Male brains tend to be larger  Most meta-analytic assessments show that focal regions sex difference studies do not really provide any definitive results Search for clinical relevance  Are sex differences in verbal abilities related to sex differences in degree of brain lateralization of verbal abilities? o The results say no **Start of Chapter 13** The occipital lobes  Not really any landmarks that clearly define where it stops on the lateral surface  Parietooccipital sulcus divides it from parietal lobe on medial surface  Calcarine sulcus o Really important because on either side of this is area V1  Cuneus  Lingual gyrus  Occipitotemporal gyrus (fusiform) From the eye to the brain: geniculo-striate system  Information from retina goes down through the optic nerve o First synapse occurs in the lateral geniculate body of the thalamus o Then travels into area V1 Visual pathways (function)  When a person staring straight ahead, what is in your left visual field projects to your right lateral geniculate nucleus and right occipital cortex  A visual field is determined by your view to the left and right of a fixation point Topographic organization  Bottom left quadrant of your visual field projects to upper right quadrant of your occipital lobe  Top right projects to bottom left, ect.  This
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