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Posner, M. I., Snyder, C. R., & Davidson, B. J. (1980). Attention and the detection of signals. Journal of Experimental Psychology: General, 109(2), 160-174. https://doi.org/10.1037/0096-3445.109.2.160
Posner MI, Snyder CR, Davidson BJ. Attention and the detection of signals. Journal of Experimental Psychology: General. 1980;109(2):160-74.