3409 Effect of uncertainty and expectation error on perception of Kansei quality Validation of a mathematical model for expectation effect using size-weight illusion

Effects of fundamental frequency changes on spoken sound loudness

“…Thus, perception of speech may be enhanced by imputing positive correlation between F0 and loudness. This "expectation effect" has been found in studies of the sizeweight illusion (Yanagisawa & Mikami, 2015). In these studies, participants' life experience with correlations between size and weight leads them to estimate that a larger object is lighter than a smaller object of the same weight.…”

“…In final position, both F0 and loudness are expected to decline. The greater difference between stimulus and expectation seems to have caused a perceptual shift from assimilation to contrast (Yanagisawa & Mikami, 2015). This paper found that when the prediction error is small, an individual's prior expectation aligns well with sensory information, leading to an assimilation effect.…”

“…Thus, an utterance-final sound with F0 + 2z above the mean is highly atypical. In studying the size-weight illusion, Yanagisawa and Mikami (2015) found that when the prediction error increased to the point that the difference is much greater than expected, participants perceived a greater-than-actual weight difference. In normal speech conditions, + 2z F0 sounds tend to be much more intense than normal F0 sounds.…”