GAD1 and Alzheimer disease: Similarly, AD+GG- mice exhibited a significant impairment in cross-habituation test, which was also rescued by Gad67 haploinsufficiency (Fig. 7c, AD-GG-: 0.90 ± 0.04; AD+GG+: 0.95 ± 0.02, p > 0.05, n = 12 AD-GG-, 20 AD-GG+, 14 AD+GG-, 23 AD+GG+).