Effect of decision weights and internal noise on the growth of d ′ with N
Robert A. Lutfi, Lynn R. Gilbertson · The Journal of the Acoustical Society of America · 2011
A general finding of psychoacoustic studies is that detectability d' of a noisy signal grows less than optimally with the number N of independent observations of the signal. Competing accounts implicate internal noise common to all observations or nonoptimal decision weights given to observations. A discriminant analysis of listeners' trial-by-trial responses in a multitone level-discrimination task favored the latter account.