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Re: Online listening tests and psychoacoutics experiments with large N
I am not in online testing, but I find the topic rather interesting.
A few issues pop out:
 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.
 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.
 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
Schulich School of Music, McGill University
555 Sherbrooke Street West
Montréal, QC H3A 1E3
Office: +1 514 398 4535 ext. 00900