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PSYCO104 Lecture Notes - Wilder Penfield, Visual Cortex, Tigger

Course Code
Blaine Mullins

of 16
Chapter 3: Methods
Nuerons modify the functioning of other neurons
Diff pathways in the NS correspond to a different behavioral functions
1. Cell recordings
a)Single cell recordings
Precision. Which cells do what.
E.g., mapping out visual cortex.
a)Mass activity of neurons
Gross behaviour.
E.g., stages of sleep, learning,
How do you record neurons? Know what their doing?
a)We can excise a neuron, look at in a pitri dish. Now can LOOK AT NEURON
inside an alive animal and see how it fxns. But we have 10-100 billion neurons
cant measure every one of them
b)Not individual neurons but millions of neurons and their behavior Ie EEG
stages of sleep entire brain neurons changes.
1. Cell recordings
a)Single cell recordings: Wilder Penfield
1950s: Used mild electrical currents
to stimulate patients with seizures
Induced movements by stimulating
primary motor cortex
Mapped out 2 “homunculi” (little
- Clamps into animals head to keep in place. Excise a piece of the skull and
insert an electrode and monitor the neuron in question.
-Hugal and Weasel won a nobel prize for mapping out the visual cortex,our
understanding of visuals and ability to recognize images is due to single cell rec
-nuerons respond to lines moving in a direction= Visual!
A) people have a sensory relation to seizures ie- burnt food can tigger sezuire.
Only treatment was to cut out part of brain causing the seizures. Maped out 2
parts of the brain 'homunculi'. One maps out all the sensations you feel
(somatosensory strip),the other for motor control (motor strip). NOT in proportion
(huge part for hands and face not trunk/feet)