"Slowness and the preceding preparatory interval effect in schizophrenia": Correction.

Reports an error in the original article by M. B. Miller et al (Journal of Abnormal Psychology, 1993[Feb], Vol 102[1], 145–251). Three "hats' were left out of the equations on page 150. The corrected passage is presented. (The following abstract of this article originally appeared in record 1993-25729-001.) Measured the reaction times (RTs) of 25 schizophrenic (SCZ), 69 matched normal, and 14 bipolar Ss to a tone preceded by a preparatory interval (PI) of varying length. RTs increase when the PI for the immediately preceding trial (PPI) is longer than the PI for the current trial. Several studies have shown that this PPI effect is heightened in schizophrenia. The authors replicated this finding. However, they found that the size of the PPI effect within groups increased with overall slowness and that the least squares regression line relating the PPI effect difference score to overall slowness did not differ between groups, nor did SCZ Ss' regression line differ from that of normal Ss. Group differences on the PPI effect were also analyzed by taking residuals for members of all groups from the normal Ss' regression line of the PPI effect difference score on overall slowness.… (PsycINFO Database Record (c) 2010 APA, all rights reserved)