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Re: Online listening tests and psychoacoutics experiments with large N

These are indeed some of the the standard tricks I was referring to :-) See references mentioned in my earlier posting and review papers by authors like Reips [1].


[1] Reips, U. (2002) Internet-Based Psychological Experimenting. Social Science Computer Review, Vol. 20, No. 3, 241-249

On 4 Jul 2007, at 13:27, Bruno L. Giordano wrote:


I am not in online testing, but I find the topic rather interesting.

A few issues pop out:

[1] Variability of presentation conditions. Improvement: equalize signals or
audio playback using data from an initial quick-and-dirty measurement of
detection thresholds at different frequencies. A way can also be found to
roughly tell apart the participant-specific sensitivity from the frequency
response of the audio playback chain.

[2] Attention level. Improvement: interleave experimental trials with
auditory detection trials. If the reaction time in any of the detection
trials exceeds a given acceptable threshold, the experiment is terminated
and data is not considered.

[3] The same person could participate to the experiment more than once. This
might not be ideal. Improvement: [a] the participant gives an email address,
and the system checks whether substrings of the address have already been
submitted for participation; [b] a different http address for the experiment
is sent to the mailbox of each of the participants (e.g., the online
executable is given a different name for each of the participants).



Bruno L. Giordano, Ph.D.
Music Perception and Cognition Laboratory
CIRMMT http://www.cirmmt.mcgill.ca/
Schulich School of Music, McGill University
555 Sherbrooke Street West
Montréal, QC H3A 1E3
Office: +1 514 398 4535 ext. 00900


Dr. H. Honing
Music Cognition Group
Institute for Logic, Language, and Computation (ILLC)
Cognitive Science Center Amsterdam (CSCA)
Universiteit van Amsterdam
I http://www.hum.uva.nl/mmm/