EEG Waves

Question 1

EEG is used to study what conditions?

EEG requires how many electrodes? where?

Answer 1

Sleep disorders, epilepsy, localization of trauma.

21, 19 in head, 1 in each ear (2: A1 and A2)

Question 2

what are the brain waves recorded by an EEG?

what are their wavelength range?

Answer 2

• Alpha 8-13 cycles/second (Hz)
• Beta 14-30 Hz
• Theta 4-7 Hz
• Delta 1-5 Hz
• Gamma 30-100 Hz
• Mu 8-13 Hz

Question 3

when do you see Alpha waves?

when do they decrease?

Answer 3

• awake, resting state (eyes closed)
• eye opening or mental exertion

Question 4

when do you see Beta waves?

when does it decrease?

Answer 4

• during activation of nervous system (during sensory input and mental activity)
• during movement

Question 5

when do you see Theta waves?

Answer 5

• children and adults during emotional stress, mental disorders, meditative state, creative state

Question 6

when do you see Delta waves?

Answer 6

• during deep sleep in adults, awake infants

Question 7

If delta waves are present in awake adults they likely indicate what?

Answer 7

brainstem injury

Question 8

when do you see Gamma waves?

when do you see Mu waves?

Answer 8

• Groups of neurons working togetherfor a specific cognitive or motor task.
• Overlaps with other frequencies. Reflects the synchronous activity of motor neurons in the resting state.

Question 9

what brain wave is this?

Answer 9

Question 10

what brain wave is this?

Answer 10

Question 11

identify the brain waves

Answer 11

Question 12

identify the brain waves

Answer 12