RT Journal Article
SR Electronic
T1 A common framework for discriminability and perceived intensity of sensory stimuli
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2022.04.30.490146
DO 10.1101/2022.04.30.490146
A1 Zhou, Jingyang
A1 Duong, Lyndon R.
A1 Simoncelli, Eero P.
YR 2022
UL http://biorxiv.org/content/early/2022/05/04/2022.04.30.490146.abstract
AB The perception of sensory attributes is often quantified through measurements of discriminability (an observers’ ability to detect small changes in stimulus), as well as direct judgements of appearance or intensity. Despite their ubiquity, the relationship between these two measurements is controversial and unresolved. Here, we propose a framework in which they both arise from the properties of a common internal representation. Specifically, we assume that direct measurements of stimulus intensity (e.g., through rating scales) reflect the mean value of an internal representation, whereas measurements of discriminability reflect the ratio of the derivative of mean value to the internal noise amplitude, as captured by the measure of Fisher Information. Combination of the two measurements allows unique identification of internal representation properties. As a central example, we show that Weber’s Law of perceptual discriminability can co-exist with Stevens’ observations of power-law scaling of perceptual intensity ratings (for all exponents), if one assumes an internal representation with noise amplitude proportional to the mean. We extend this result by incorporating a more general physiology-inspired model for noise and a discrimination form that extends beyond Weber’s range, and show that the combination allows accurate prediction of intensity ratings across a variety of sensory modalities and attributes. Our framework unifies two major perceptual measurements, and provides a potential neural interpretation for the underlying representations.Competing Interest StatementThe authors have declared no competing interest.