GRIN1 and Anxiety: Animals did not show anxiety, monoamine levels were not increased [91], and there were no alterations in the expressions of phosphorylated calcium/calmodulin-dependent protein kinase II (p-CaMKII) and N-methyl-D-aspartate receptor 1 (NMDAR1 or NR1) in the hippocampus, probably due to smaller intermittency of CTN, CTN’s smaller R-weighted sound pressure level based on rats’ auditory sensitivity [92].