The Joint Prior model of audiovisual speech perception.

Upper row: Example plots of prior, likelihood and posterior distributions. The horizontal axes represent the auditory dimension and the vertical dimension represents the visual dimension. The prior is a Gaussian ridge along the A = V diagonal, and the likelihood is a Gaussian (here depicted with greater variance in the visual dimension). The posterior distribution is also Gaussian, pulled in the direction of the A = V diagonal. Lower row: the marginal distribution of the prior, likelihood and posterior in the auditory dimension. Response boundaries (vertical lines) are applied to the posterior distribution and response probabilities are estimated as the probability mass (yellow area) delimited by the response boundaries.