Graph / Overlay multiple sessions

[Phasma]

Hi James,
Awesome site! Thank you so very much for creating and supporting this.
I am trying to determine if different types of meditation make a difference e.g., led, biaural beats (at various frequencies), unled etc.

I would like to take the graphs from each of these sessions and then overlay them. For instance, the alpha graph from a biaural beat session at different frequencies of biaural sounds.

I can do this visually in the graphs but would like to be able to have these overlayed.

Is this possible?

Thanks in advance for the help.

[James]

Sure, but you'd need to do that yourself in Excel.

[Phasma]

okay thanks

[Phasma]

Thank you again, your site and info is amazing. As an educator I have complement you on the clear presentation of how to do the graphing myself. I not only learned how to do it for this effort, but learned a lot about MACROs.

These are great for plotting the averages!

Can you point me in the direction of how to plot these "relative" to each other? Sorry I searched youtube but found nothing that was helpful.

Thanks again

[James]

Relative waves are calculated from the Absolute waves using this formula:

relative wave = absolute wave / sum(all absolute waves)

e.g.:

alpha_relative = (10^alpha_absolute / (10^alpha_absolute + 10^beta_absolute + 10^delta_absolute + 10^gamma_absolute + 10^theta_absolute))

[billylo]

Hi, I am new to EEG analysis. Can you help me understand the use of 10^absolutePowerAlpha (instead of just absolutePowerAlpha) for the math?

thanks! Billy.