effect of loudness on perceived duration

[Amandine Penel <Amandine.Penel@xxxxxxxxxxxxxxxxxxxxx>]

Dear Members of the Auditory List,

Does anyone know any research showing that (or/and explaining why)
an inter-onset interval between a soft event and a loud one (IOIa)
is perceived as being longer than:
1. an inter-onset interval of the same physical duration between
a loud event and a soft one (IOIb)
2. an inter-onset interval of the same physical duration between
two loud events? (IOIc)

I observed this in an experiment where participants were
asked to perceptually adjust inter-onset intervals, according to a
metronome set to 100 beats per minute (IOI of 600ms). Markers were
piano tones played legato. The soft and loud events
were respectively a single tone and a chord (constituted of
between 4 and 6 tones).

The effect was of approximately 45ms (so that IOIs of type a were
for example adjusted at 580ms and IOIs of type b and c at 625ms).

I would appreciate very much any insights on this question,

Amandine Penel

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                                                Amandine Penel
                      Laboratoire de Psychologie Experimentale
                       28, rue Serpente   75006 Paris - France
Tel: 33-1-40519865. Fax: 33-1-40517085.
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