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Table 2. 
Correlations and Factor Loadings of Selected WM Performance Measures
Measure123456PC1
1. Count-span accuracy – .13 .30 .43* .02 .36* .56*** 
2. In-scanner WM accuracy .13 – .54** .43* .36* .19 .71*** 
3. In-scanner WM 1-RT .30 .54** – .30 .37* .38* .78*** 
4. n-back accuracy .43* .43* .30 – .29 .29 .72*** 
5. n-back 1-RT .02 .36* .37* .29 – .02 .51*** 
6. Prescan WM capacity .36* .19 .39* .29 .02 – .56*** 
Measure123456PC1
1. Count-span accuracy – .13 .30 .43* .02 .36* .56*** 
2. In-scanner WM accuracy .13 – .54** .43* .36* .19 .71*** 
3. In-scanner WM 1-RT .30 .54** – .30 .37* .38* .78*** 
4. n-back accuracy .43* .43* .30 – .29 .29 .72*** 
5. n-back 1-RT .02 .36* .37* .29 – .02 .51*** 
6. Prescan WM capacity .36* .19 .39* .29 .02 – .56*** 

Six WM measures selected for latent variable (WML) analyses and their intercorrelations (see main text for selection details). PC1 = loadings of each measure with Principal Component 1 (i.e., WML). RTs were reversed scored for ease of interpretation (1-RT). p values, uncorrected.

*

p < .05

**

p < .01

***

p < .001.

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