ACOUSMA By N., Sam M.S. - 12 noun. An unspoken hallucination, like a humming in the ear, calling out, or ringing noise. ACOUSMA: "The concert left many audience members experiencing acousma for days to come." Related Psychology Terms DETECTION THEORY HEARING (AUDITION) PUBLIC-SPEAKING ANXIETY AUDITORY SPACE PERCEPTIO HEARING Diagnosis and Treatment Planning NURSERY SCHOOL EXPERIENCE Counselor's Role in Emergency Teams Developing a Case Study HABIT Cite this page: N., Sam M.S., "ACOUSMA," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/acousma/ (accessed June 29, 2022).