The averaged fitted parameters of the four dichoptic pairs.

<p>Left panel shows the averaged ‘Gamma’ of the four dichoptic pairs. ‘Gamma’ denotes the non-linearity in the binocular combination, the less the gamma, the less the non-linearity; Right panel shows the averaged effective signal ratio at balance point of the four dichoptic pairs. Effective signal ratio at balance point indicates the signal ratio that is needed to balance the dominant eye with the nondominant eye in binocular combination. Error bars represent standard errors. Significance of the compartment between the second-order dichoptic pairs and first-order dichoptic pair is marked in the figure: ***, <i>p</i><0.001, 2-tailed T test.