Abstract
Sixty-years-worth of publications show that there is no loudness change of a tone given to only one ear. But when, additionally, a same-frequency tone is presented intermittently to the other ear (“Simultaneous Dichotic Loudness Balance”), its amplitude must be progressively lowered in order to have equal loudnesses at the two ears. Why? Professor K.H. Norwich calls this the “mystery of loudness adaptation”, and claims to solve it (Bull Math Biol 2010), through “mathematical exploration” of monaural (single-ear) tone presentation versus binaural (two-ears) tone presentation. Norwich’s model is carefully scrutinized here. It proves to be riddled with arbitrary claims, contradictions, and incongruities. There is an alternative, a model by Nizami which explains ten known idiosyncracies of Simultaneous Dichotic Loudness Balance.
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