Illustration of the perceived virtual sound image direction for the IHP (a, e, i, m), 30° leftward rotation (b, f, j, n), 0.03 m leftward lateral (c, g, k, o) and 0.03 m frontal (d, h, l, p) displacement. Dotted line: the perceived direction of the virtual source. Solid line: head-centred reference radius pointing to the listener’s right (ipsilateral 90° direction), rotated/translated with the head to depict the imposed motion. First row: 30° span configuration – central image [ITD = 0 μs, ILD = 0 dB]. Second row: 30° span configuration – lateral image [ITD = 750 μs, ILD = 10 dB]. Third row: 180° span configuration – central image [ITD = 0 μs, ILD = 0 dB]. Fourth row: 180° span configuration – lateral image [ITD = 750 μs, ILD = 10 dB].