PSYCO104 Lecture 7: BIOLOGICAL FOUNDATIONS

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PSYCHO 104, LECTURE 7: BIOLOGICAL FOUNDATIONS (29/01/19)
Argument from antiquity
'average person uses 10% of their brain'
You use all of your brain all the time
BRAIN
“The brain is a grapefruit-size mass of tissue that feels like jelly and looks like a
grayish gnarled walnut” (Passer & Smith, 2001, p. 81)
Allows us to do all the things of life
Operates in a neuroelectric way
Connected to a lot of other neurons
Where most mental events are formed
Range of experiences you'll ever feel are at root of the electrical chemical
processes of the brain [Consequences of electro-chemical networks]
Neurons
Neurons are the building block of the brain.
Approximately 100 billion neurons at birth
Types of Neurons
Sensory neurons
Recode outside brain information and transmit to spinal cord/ brain
Interneurons
Pass info along neurons that communicate with other neurons
Motor neurons
Transmitting messages from central nervous system to the muscles
Glial cells
There are about 10 glial cells: 1 neuron
Important for Waste disposal and axon protection
Also Implicated in learning and memory
Neural Activity
This is the key to understanding brain function
Dendrite
Absorbs chemical stimulation from other neurons
Soma (nucleus)
If dendritic activity is large enough an action potential will be fired
If the dendritic activity is important enough an action potential will be fired by
the SOMA
All or nothing
It is responsible for Decision making
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Document Summary

You use all of your brain all the time. Neurons: neurons are the building block of the brain, approximately 100 billion neurons at birth. Types of neurons: sensory neurons, recode outside brain information and transmit to spinal cord/ brain. Interneurons: pass info along neurons that communicate with other neurons, motor neurons, transmitting messages from central nervous system to the muscles, glial cells, there are about 10 glial cells: 1 neuron. This is the key to understanding brain function: dendrite, absorbs chemical stimulation from other neurons, soma (nucleus) If dendritic activity is large enough an action potential will be fired. If the dendritic activity is important enough an action potential will be fired by the soma: all or nothing. All these neural activities happens about 100 million times. Resting potential of a neuron: this is the electrical charge inside a neuron (relative to outside) when the neuron is essentially at rest and receiving no stimulation.

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