Studies have shown that the attack (onset) of a sound plays an important role in a listener’s ability to accurately determine the sound’s source. In Saldanha and Corso 1964, listeners were able to identify the source of a tone with 50% greater accuracy if the attack of the sound was included in the sample, as opposed to a sample that cuts out the attack and plays only the sustain of the sound.
Therefore the attack of a sound must greatly influence our perception of timbre. In order to summarize the most important aspects of a timbre, my methodology must have an adequate way of accounting for the attack of the sound. How to do this? At the moment, my methodology is based on a system of oppositions. My first thought, of course, was an opposition between sounds with a fast attack and a slow attack. But isn’t this oversimplifying? There are probably degrees of variance between “fast” and “slow.” (Now you have a little insight into what I think about when I walk between my apartment and the cafe.)
The critique of binaries as being over-generalizing is leveled at me a lot. But McAdams 1999 shows that perhaps this isn’t actually a damaging oversimplification.