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. 2016 Feb 26;6:21866. doi: 10.1038/srep21866

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Copyright © 2016, Macmillan Publishers Limited

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Each row shows a likelihood (left column: the information associated with a particular visual-haptic signal), a coupling prior (middle column) and their product, the posterior (right column). Coupling priors in different rows reflect (i) no relationship between visual gloss and haptic rubberiness (top row), or (ii) a weak (rows 2–3) or strong (row 4) negative correlation or (iii) a weak positive correlation (rows 5–6). The effect of different coupling priors can be seen for stimuli lying on the axis of the negative prior (such as C_A), or lying on the axis of the positive prior (C_B). For comparison, the blue ring represents a ‘standard’ stimulus – an object in the middle of the visual-haptic space.