On the detection of signals in non-white noise.
We have studied the detection, by human observers, of suprathreshold bandlimited signals embedded at various locations in non-white, Gaussian filtered noise. Detection models based upon the direct cross-correlation between the signal and the noise image (matched filtering) cannot account for the results of our experiments. Our findings point instead at a detection process occurring at the level of signal decomposition, and jointly determined by: (a) the differential outputs of discrete, bandlimited spatial analyzers selectively responsive to different components of the signal; and (b) variable detection rules adaptively related to such outputs and to the type of signal information available to the observer.
Moraglia
G
G
Department of Psychology, University of Alberta, Edmonton, Canada.
Caelli
T
T
D006801:Humans; D008433:Mathematics; D009622:Noise; D012684:Sensory Thresholds; D014796:Visual Perception / Q000502:physiology*