frequency domain

Question 1

eeg signals can also vary based on

Answer 1

frequency and form

• depending on a persons state

Question 2

how can you break down the noisy data collected by EEG?

Answer 2

• EEG plots time against uV
• need to transfer this into data identifying what voltages are present at what frequencies
• new data can be plotted on a frequency power spectrum (see figure 1), highlighting which type of brain activity is present during specific tasks

Question 3

how it the frequency power spectrum created

Answer 3

Fourier transform

Question 4

frequencies of oscillations

Answer 4

frequencies can range from 1-4Hz oscillations per second often recorded in sleep referred to as delta activity, all the way up to 30-100Hz oscillations per second called gamma activity.

• this is important to be aware of as the differing oscillations represent differing brain states