Abstract
Both reward based operant conditioning (OC) and reflex-based prepulse inhibition (PPI) procedures are used in sound localisation studies in mice. Since the results of both procedures are compared in the literature, it is important to assess whether they provide similar results if the same stimulus paradigm is applied. Here, we compare the sensitivity of C57BL/6 mice in OC and PPI procedures for detecting a switch in speaker location using broadband and narrowband noise stimuli and determined their minimum audible angle (MAA). In the OC procedure, we calculated d' values from the hit and false alarm rates. In the PPI procedure, we calculated the area under ROC curves from the startle response amplitudes and derived da values to obtain a sensitivity measure that corresponds to d'. For both procedures, the mean sensitivity to the speaker switch increased with an increase in angular separation. For broadband noise stimuli, a d' of up to 3.3 (OC) and a da of up to 1.1 (PPI) were observed at large speaker separations. Narrowband noise stimuli resulted in lower sensitivities in both procedures, resulting in a maximum d' of 2.0 (OC) and a maximum da of 0.3 (PPI). Using a sensitivity of 1.0 as the threshold criterion, broadband noise MA...Continue Reading
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