global brain activity

Question 1

What are brain rhythms

Answer 1

reflect the factors that we have in our environment, sleeping, and waking, breathing, steps of walking, stages of night sleep.

Question 2

What are the basic requirements for signal detection

Answer 2

A whole population of neurons must be active in synchrony to generate a large enough electrical field at the level of the scalp

this population of neurons must be aligned in a parallel orientation so that they summate rather than cancel out

Question 3

What does the amplitude of the EEG signal depend on

Answer 3

partly depends on how synchronous the activity of the underlying neuron is. the number of active cells, the total amount of excitation, the timing of activity.

Question 4

How is syncronous activity generated

Answer 4

pacemaker cells or one neuron oscillators are located in the thalamus, thalamic cells have a set voltage gated ion channels that allow each cell to generate rhythmic, self sustaining discharge patterns.

Question 5

What is the function of having diff brain rhythms

Answer 5

activity coordination of diff cortical regions

Question 6

What are some behavioural criteria associated with sleep

Answer 6

reduced motor activity, decreased response to stimulation, stereotypic postures and relatively easy reversibility.

Question 7

What are the 3 broad sleep states

Answer 7

Awake, Non-REM, REM (rapid eye movement)

Question 8

In CT scans of the brain what colour is the skull

Answer 8

The skull appears white

Question 9

Outline CT scans

Answer 9

based on X-ray absorption, bones absorb the most and cerebrospinal fluid absorbs the least.