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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 .
 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:
 Variability of presentation conditions. Improvement: equalize
audio playback using data from an initial quick-and-dirty
detection thresholds at different frequencies. A way can also be
roughly tell apart the participant-specific sensitivity from the
response of the audio playback chain.
 Attention level. Improvement: interleave experimental trials with
auditory detection trials. If the reaction time in any of the
trials exceeds a given acceptable threshold, the experiment is
and data is not considered.
 The same person could participate to the experiment more than
might not be ideal. Improvement: [a] the participant gives an email
and the system checks whether substrings of the address have
submitted for participation; [b] a different http address for the
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
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