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Chapter 6

PSYC 1010 Chapter Notes - Chapter 6: Frontal Lobe, Cerebral Hemisphere, Visual Cortex

Course Code
PSYC 1010

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The Cerebral Cortex
What four lobes make up the cerebral cortex, and what are the functions of the motor cortex,
somatosensory cortex, and association area?
Cerebrum is newer, compared to the older brain which sustain basic life functions, enable
memory, emotions and basic drives
Cerebrum form specialized work teams that enable out perceiving, thinking, and speaking
**above brainstem is thalamus, hippocampus, and amygdala (from other chap)
Cerebral hemispheres come as pair
Covering this is the cerebral cortex: thin layer of interconnected neural cells
Structure of the Cortex
Four lobes, separated by folds
Frontal lobes: behind forehead
Parietal lobes: at the top and to the rear
Occipital lobes: back of head
Temporal lobes: just above ear
Each lobe has many functions
Function of cortex
Motor Functions
Elective stimulations to parts of an animals vortex made parts of its body move
Effects are selective: stimulation caused movement only when applied to an arch-shaped region at
the back of the frontal lobe, running ear to ear across top of brain
Controls volunteer movements
Mapping the Motor Cortex
Brain has no sensory receptors
A neuroscientist, when doing research on an open brain, stimulated a spot on a patient's left
motor cortex, triggering the right hind to make a fist
The amount of cortex devoted to a body part in the motor cortex(frontal lobe) or in the
somatosensory cortex (in the parental lobes) is not proportional to the body parts size
Rather, brain devotes more tissue to sensitive areas or areas requiring precise control
o The fingers have greater rep in cortex than the upper arm
Brain-computer interfaces
Could a paralyzed person move a robotic limb? Yes
By thinking the action, the money was able to make the computer do as thought
Cognitive neural prosthetics: direct robotic arm with thoughts
Machine learning: learning how to move computer/electrical body part with the help of computer
Sensory Functions
If cortex sends messages to the body, where does it receive incoming messages?
Somatosensory cortex: area of the front parental lobe that registers and processes body touch
and movement sensations
The more sensitivity the body has, the larger the somatosensory cortex area devotes to it
Lips are sensitive and have a larger part of the brain, whereas the toes dont
For eg, LSD produces vivid hallucinations
o fMRI scans show dramatically increased connectivity of the visual cortex
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