FIG. 7.

Effects of pinna manipulations on horizontal acuity. Discrimination functions were measured in four mice with bursts of broadband noise while one ear was plugged (A, B) or distorted in shape (C, D). The manipulations were applied individually to the ear near the speaker array (ipsilateral) or the far ear (contralateral). Results are described in terms of the change in d′ relative to normal performance. Arrow, mouse M2009_PA showed complete behavioral disruption when tested with an ipsilateral ear plug. Data from this mouse are shown for the only location that generated more than five trials.