Mental Arithmetic TaskFREE for use with an Inquisit Lab or Inquisit Web license.
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Mental Arithmetic Task - English
Search Google Scholar for peer-reviewed, published research using the Inquisit Mental Arithmetic Task.
Kahneman, Daniel, et al. “Pupillary, Heart Rate, and Skin Resistance Changes during a Mental Task.” Journal of Experimental Psychology, vol. 79, no. 1, 1969, pp. 164–167.