Boxplots depicting cognitive and motor composite scores for the HIV, PD, and CTRL participants. Follow-up t-tests indicated a graded group effect for EF, with both HIV and PD scoring lower than CTRL [HIV vs. CTRL: t(76) = 5.39, p = .0001, Cohen’s d = 1.24; PD vs. CTRL: t(76) = 2.06, p = .04, Cohen’s d = .47] and HIV scoring even lower than PD [t(80) = 3.42, p = .001, Cohen’s d = .76]. For IPS, HIV scored lower than CTRL [HIV vs. CTRL: t(74) = 2.82, p = .006, Cohen’s d = .66]. Both HIV and PD scored lower than CTRL on MEM [HIV vs. CTRL: t(77) = 3.08, p = .003, Cohen’s d = .70; PD vs. CTRL: t (76) = 2.20, p = .03] and VSP [HIV vs. CTRL: t(75) = 4.52, p = .0001, Cohen’s d = 1.04; PD vs. CTRL: t (75) = 2.71, p = .008, Cohen’s d = .63]. PD scored lower than CTRL and HIV on MOT [PD vs. CTRL: t (73) = 4.77, p = .0001, Cohen’s d = 1.12 PD vs. HIV: t(78) = 3.31, p = .001, Cohen’s d = .75].