Abstract
Backward-masking recognition accuracy, IQ, Scholastic Aptitude Test (SAT) scores, and reaction time (RT) on masking trials were obtained from 81 Ss. Of primary concern was the correlation between the first two variables. In 11 previous studies the correlation between the inverse of recognition accuracy, recognition threshold, and IQ has ranged from -0.20 to -0.92. This variation is negatively related to sample size, r = -0.69. An N of 81 predicts a recognition-accuracy correlation of +0.11. The obtained correlation is +0.44, substantially higher than predicted. The median correlation from the other 11 studies is in good agreement with this value, median r = -0.54 (recognition threshold). Other findings are that backward-masking threshold was not significantly related to SAT scores, but IQ and SAT (Total) scores were significantly related, r = 0.44. Masking RT, both direct and derived measures, did not correlate with any other variable. It is suggested that masking threshold may reflect fluid intelligence (IQ) more than crystallized intelligence (SAT).
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