Week 12 Flashcards
(30 cards)
brain waves
activity of neurons in regular firing rhythm
EEG signals are affected by
state of arousal of the cerebral cortex, and show changes in different stages of sleep. also affected by stimulation from the external environment
EEG recording is difficult bc
small size of voltage signals
In this laboratory you will record EEG activity with two electrodes
a frontal electrode on the forehead, and an occipital electrode on the scalp
-a third electrode reduces electrical interference
The rhythmic events that these waves reflect often arise
in thalamus
alpha
when the eyes are closed and subject is relaxed. they are strongest over occipital and frontal cortex.
beta
alert individuals with their eyes open, the dominant rhythm is beta.
theta
in awake children up to adolescence, but not seen in awake adults. normal during sleep at all ages.
delta
dominant rhythm in sleep stages 3 and 4 but is not seen in the conscious adult.
-has highest amplitude of any of the component EEG waves
gamma
associated w higher mental activity, including perception and consciousness
-involved in integrating various aspects of an object (color, shape) to forma coherent picture
the more active the brain
higher the frequency, lower the amplitude of EEG
Sleep consists of two very different alternating stages
non REM and REM sleep (rapid eye movements)
non REM
-decrease in blood pressure, and heart and respiratory rates
-serotonin levels are increased
REM
-variation in heart rate/blood pressure
-irregular breathing
-corticosteroids and in males, testosterone is secreted
stage 1 and 2
stage 3 and 4
- light stages of sleep
- deep sleep
stage 1
stage 2
stage 3
stage 4
- decreasing alpha and beta activity
- irregular theta activity
- delta activity less than 50% of time
- delta activity
left hemisphere
logical half concerned w reasoning, problem solving, and language
right hemisphere
more intuitive, creative side concerned w images
when she clapped
EEG spiked up
when her eyes closed
alpha waves were spiked
when her eyes were open
alpha waves flattened
when she was not doing math
alpha waves were spiked
when she was doing math
alpha waves were smaller. they were shortened and thinned out.
Classical music
rock music
- slight peaks in her alpha and beta waves
- larger peaks in her alpha and beta waves
which part is responsible for visual recognition?
occipital
if someone has injury in frontal lobe what happens?
reasoning and decision making
