Spatial frequency summation in visual noise.

Kersten [Vision Res. 27, 1029 (1987)] reported that absolute efficiency for the detection of static, one-dimensional bandpass noise was high and approximately constant for stimulus bandwidths ranging from 1 to 6 octaves. This result implies that human observers integrated information efficiently across a wide range of spatial frequency. One interpretation of this result--and similar results obtained with auditory stimuli [J. Acoust. Soc. Am. …