highly significantP < 0.001
a strong trendP = 0.0624
This revealed a highly significant covariation of freezing with synaptically expressed GluA1 (sGluA1, r 2 = 0.9648, P < 0.001) but not extrasynaptically expressed GluA1, although we still detected a strong trend (eGluA1, r 2 = 0.6217, P = 0.0624).