Re: Auditory Steady-State Response

Hi Chip,

In Kim¹s experiment the two tones were played simultaneously, one to the
right sound field and the other to the left sound field. In your experiment,
the two tones were played separately both into the same sound field (if I
understand correctly). In Kim¹s experiment, I would guess that the signal
picked up by the Cz electrode was produced more-so by the processing of the
AM tone than the actual sensory reception of that sound. The differences in
your experiments may have removed some that sensory processing.

Try using Audacity to create an audio file in ³stereo² where the left
channel plays the 37hz AM tone and and right channel plays the 43hz AM tone.

This is simply a guess at what the issue may be, assuming the experiment was
conducted correctly otherwise.

Cheers,
John



From:  Chip Audette <[email protected]>
Reply-To:  "Discussion of EEG hardware, software, training protocols, NFB
theory - for developers and users." <[email protected]>
Date:  Sun, 25 Jan 2015 21:32:18 +0000
To:  "[email protected]"
<[email protected]>
Subject:  [Openeeg-list] Auditory Steady-State Response

Hi All, 

I'm trying to obtain an Auditory Steady-State Response based on
amplitude-modulated tones.  I thought that my setup was pretty decent (based
on a paper by Do-Won Kim) but I was unsuccessful in detecting the expected
EEG rhythms.

A description of my setup, some pics, and an analysis of my data are here:

http://eeghacker.blogspot.com/2015/01/brain-got-beats-not-yet.html

Has anyone else had success with seeing auditory steady state response?  Do
you have any suggestions on how to improve my setup or my stimulation?

Thanks,

Chip

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