APA Dictionary of Psychology

observer

Updated on 11/15/2023
n.
  1. one who makes or records an observation.
  2. one who is the subject of, and who attends to presented stimuli in, psychophysical testing. In this sense, the term is abbreviated O. See also ideal observer.
  3. in telepathy experiments, a participant who is neither the designated sender nor the designated receiver. Their function is often to guard against experimenter bias or other methodological errors.

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