Find peer-reviewed, published research using the Inquisit Letter Memory Task
Morris, N., & Jones, D. (1990). Memory updating in working memory: The role of the central executive. British Journal of Psychology, 81, 111.
Inman, Tina Hanlon, Vickery, Chad D., Berry, David T. R., Lamb, David G., Edwards, Christopher L., & Smith, Gregory T. (1998). Development and Initial Validation of a New Procedure for Evaluating Adequacy of Effort Given During Neuropsychological Testing: The Letter Memory Test. Psychological Assessment, 10(2), 128-39.
Greub, B., & Suhr, J. (2006). The validity of the letter memory test as a measure of memory malingering: Robustness to coaching. Archives of Clinical Neuropsychology, 21(4), 249-254.
Friedman, N., Miyake, A., Young, S., DeFries, J., Corley, R., Hewitt, J., & Ferreira, Fernanda. (2008). Individual Differences in Executive Functions Are Almost Entirely Genetic in Origin. Journal of Experimental Psychology: General, 137(2), 201-225.
Miyake, A., & Friedman, N. (2012). The Nature and Organization of Individual Differences in Executive Functions. Current Directions in Psychological Science, 21(1), 8-14.