Mean (+SEM) startle response in arbitrary units to acoustic stimuli of 0, 74, 90, and 110 dB after pretreatment with intra-LHb infusions of DEX (0, 0.5, or 1.0 μg/side). Group sizes were n = 17, 18, and 13 for the vehicle, low dose, and high dose groups, respectively. * p < 0.05 when compared to the vehicle control group.