Further analysis of the behavioural data on whether the fidelity of visuospatial representation of the egocentric positions or the explicit body-centred sensorimotor transformation is impaired by congenital deafness. (A) Hypothesis and predictions. (B) Spatial congruency effect between the allocentric and egocentric positions. Left panel: the fork’s allocentric and egocentric position could be either congruent (both left or both right) or incongruent (one left and one right). All the possible stimulus combinations in the congruent versus incongruent condition were shown for the dark grey fork as an example. For demonstration purposes, the mean RTs (top) (congruent versus incongruent: ALLO, z < −11.5, P < 0.001; HLB, χ² < 2.5, p > 0.05, GLMM) and error rates (bottom) (congruent versus incongruent: ALLO, z > 7.5, P < 0.001; HLB, χ² < 3.5, p > 0.05, GLMM) are shown as a function of the congruent versus incongruent condition in both groups’ allocentric and HLB tasks (right panel).