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PSD Plot Shows where average power is distributed as a function of frequency.
Frequency is on the x-axis, amplitude is on the y-axis
Only shows data for the peak that was selected in the spectrogram.
Put cursor on the peak in the PSD plot for the exact values for the frequency where amplitude is
the highest
Better for obtaining exact values of amplitude and frequencies from specific point in the data
Spectrogram Color plot that shows same info as PSD plot but over a long period of time
Frequency is on the y-axis, amplitude is on the x-axis (OPPOSITE)
Color of the band indicates the amplitude
Good for comparison of eyes shut vs. eyes open data
Better represents the true population of cells and are less impacted by artifacts
Fast Fourier Transform Apply this to the raw data, and it will re-plot the data to show the
amplitude of the waves at each frequency for the period of time you want to observe.
Shows what voltages are present at each frequency.
Brings out smaller signals that are difficult to see
, Every signal can be thought of as the sum of a bunch of sine waves
Can separate out the noise
EEG Results from the slow changes in the membrane potentials of cortical neurons -
especially EPSPs and IPSPs.
Large amplitudes require synchronous activity of a large number of neurons.
Measured from occipital lobe by placing positive electrode on inion.
It picks up signals from superficial layers of the brain, such as the cortex.
EEG 10-20 system Map to guide the placement of electrodes
Letter indicates brain region:
Odd numbers = left hemisphere
Even numbers = right hemisphere
Alpha waves Frequency of 8-13 Hz
Posterior dominant
Become more pronounced during eyes closed period. (Light is an inhibitor)
Generated from the thalamus
PSD Plot Shows where average power is distributed as a function of frequency.
Frequency is on the x-axis, amplitude is on the y-axis
Only shows data for the peak that was selected in the spectrogram.
Put cursor on the peak in the PSD plot for the exact values for the frequency where amplitude is
the highest
Better for obtaining exact values of amplitude and frequencies from specific point in the data
Spectrogram Color plot that shows same info as PSD plot but over a long period of time
Frequency is on the y-axis, amplitude is on the x-axis (OPPOSITE)
Color of the band indicates the amplitude
Good for comparison of eyes shut vs. eyes open data
Better represents the true population of cells and are less impacted by artifacts
Fast Fourier Transform Apply this to the raw data, and it will re-plot the data to show the
amplitude of the waves at each frequency for the period of time you want to observe.
Shows what voltages are present at each frequency.
Brings out smaller signals that are difficult to see
, Every signal can be thought of as the sum of a bunch of sine waves
Can separate out the noise
EEG Results from the slow changes in the membrane potentials of cortical neurons -
especially EPSPs and IPSPs.
Large amplitudes require synchronous activity of a large number of neurons.
Measured from occipital lobe by placing positive electrode on inion.
It picks up signals from superficial layers of the brain, such as the cortex.
EEG 10-20 system Map to guide the placement of electrodes
Letter indicates brain region:
Odd numbers = left hemisphere
Even numbers = right hemisphere
Alpha waves Frequency of 8-13 Hz
Posterior dominant
Become more pronounced during eyes closed period. (Light is an inhibitor)
Generated from the thalamus
