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I'm currently reading "Perceived Order in Different Sense Modalities" (Hirsh and Sherrick, 1961). In they repeatedly use the abbreviation "O" and I have no idea what it stands for. It seemed to have been in common use back in those days, but fallen out of favor since. Some usage examples:

  • To investigate the limits of the ability to distinguish successive from simulateneous events, we need only a pair or series of events about which we can ask O whether there were one or two [...].
  • The question for Exp. I was: how much time must intervene between two visual stimuli for O to report correctly the order in which they occur?
  • Four trained Os, between 18 and 30 yr. old, were tested singly.

Obviously, O means something along the line of "subject" or "participant". However, I'm wondering what it stands for exactly. My best guess would be something like "observer".

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  • 4
    I'd go with observer, too. Unfortunately, the article's behind a paywall or I'd look closer. Nov 25 at 17:26
  • 3
    I have zero familiarity with this field, but I found this (see point 2): dictionary.apa.org/observer . Someone else might be able to confirm if that applies to your context.
    – GoodDeeds
    Nov 25 at 19:54
  • Observer. It seems so from the examples.
    – Alchimista
    Nov 26 at 8:11

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