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A measure of auditory-visual integration efficiency based on fechnerian scaling

Auditory-visual integration efficiency (IE) is a presumed skill employed by subjects independently from their ability to extract information from auditory and visual speech inputs. Currently there are no established methods for determining a subject’s IE. Here we present a novel measurement technique to address this issue without requiring explicit assumptions about the underlying audiovisual processing. It is based on a version of the theory of Fechnerian Scaling developed by Dzhafarov and Colonius (Dzhafarov, E.N. and Colonius, H. (2006)). Reconstructing distances among objects from their discriminability, Psychometrika, 72(2), 365-386), that permits the reconstruction of subjective distances among stimuli of arbitrary complexity from their pairwise discriminability.