E. Hazeltine, D. Teague, and R. B. Ivry have presented data that have been interpreted as evidence against a central bottleneck. This article describes simulations of their Experiments 1 and 4 in the ACT-R cognitive architecture, which does possess a central bottleneck in production execution. The simulation model is capable of accounting for the…

Stroop dilution is the reduction of the Stroop effect in the presence of a neutral word. It has been attributed to competition for attention between the color word and neutral word, to competition between all stimuli in the visual field, and to perceptual interference. Five experiments tested these accounts. The critical manipulation was whether…

McClelland and O'Regan's interpretation of data may not be appropriate. One could argue that subjects used different strategies in the expectation and no-expectation conditions. Second, an inappropriate baseline condition may have been used. Finally their results may not be generalizable to the use of parafoveal vision during reading. (Author/RD)