Table 1.
Mean Accuracy, Standard Errors, and the Spearman-Brown Corrected Split-Half Reliability for the Eight Tasks
| Stimulus and Task | Partial Correlations | Correlation Corrected for Attenuation | Upper Bound Correlation | Correlation | Split-Half Reliability | M | SE |
|---|---|---|---|---|---|---|---|
| Face upright | |||||||
| Spacing | .42 | .69 | .79 | .55 | .75 | .79 | .013 |
| Part | .84 | .77 | .013 | ||||
| Face inverted | |||||||
| Spacing | -.06 | .22 | .75 | .16 | .78 | .71 | .015 |
| Part | .74 | .62 | .014 | ||||
| House upright | |||||||
| Spacing | -.12 | .06 | .82 | .05 | .88 | .79 | .010 |
| Part | .77 | .81 | .010 | ||||
| House inverted | |||||||
| Spacing | .02 | .25 | .87 | .22 | .86 | .79 | .010 |
| Part | .88 | .83 | .013 |
Note-The upper bound of the correlation (the square root of the product of the reliability scores) between the part and spacing tasks for each condition is similar and high for all stimuli. Zero-order correlation and the correlation corrected for attenuation between the spacing and part tasks were higher for upright faces than for nonfaces. The partial correlations are the correlation between the spacing and part discrimination tasks for each stimulus, while holding performance on the six other tasks constant.