Subject: Re: Online listening tests and psychoacoutics experiments with large N From: Henkjan Honing <honing@xxxxxxxx> Date: Thu, 5 Jul 2007 19:03:54 +0200 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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]. hh [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: > Hello, > > 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). > > Cheers, > > Bruno > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > 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 > Canada > Office: +1 514 398 4535 ext. 00900 > http://www.music.mcgill.ca/~bruno/ ____________________________________________________________ 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/ ____________________________________________________________