In the humor , diabetic , and control groups , ( 1 ) learning ability improved by 38.5 % , 33.4 % , and 24.0 % , respectively ( P = .025 ) ; ( 2 ) delayed recall improved by 43.6 % , 48.1 % , and 20.3 % , respectively ( P = .064 ) ; and ( 3 ) visual recognition increased by 12.6 % , 16.7 % , and 8.3 % , respectively ( P = .321 ) .