Binaural amplitude discrimination and the binaural masking-level difference.
Under certain conditions, amplitude discrimination is not a monotonic increasing function of signal-to-noise ratio. The non-monotonicity arises when the tones to be discriminated are presented 180 degrees out-of-phase at the observer's ears and just above their detection 'threshold' in noise that is in-phase at the observer's ears, and with 2-6-dB differences in amplitude.
Henning
G B
GB
Department of Experimental Psychology, Oxford, U.K.
D000161:Acoustic Stimulation; D001307:Auditory Perception / Q000502:physiology*; D001309:Auditory Threshold; D004192:Discrimination, Psychological / Q000502:physiology*; D006801:Humans