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In this article, we develop a hypothesis on the role of spectral entropy in conveying a sensation of termination for short musical fragments. We tested the hypothesis in an experiment presenting spectral sequences involving sounds categorised in three families (pitch, bell, or noise) and asked 64 participants to rate their levels of closure in a Likert scale with five degrees. The results highlight an agreement by all participants to consider stimuli transiting from organised (e.g. pitch) to disorganised spectra (e.g. bells, noise) as more complete than transitions from the opposite direction. [ABSTRACT FROM AUTHOR]

This paper reports on an exploratory study in the field of electroacoustic music aimed at understanding whether a sensation similar to that associated with the concept of "cadence" in relation to tonal music can be identified when listening to sounds diffused in space. Using a variety of patterned stimuli in a perceptual experiment, we asked listeners to evaluate the completeness of multiple trajectories on the horizontal plane. The results show differences across multiple categories of listeners, and suggest that listeners acquainted with spatial music consider trajectories more complete when presenting the last two impulses at opposite directions from the centre. [ABSTRACT FROM AUTHOR]