Introduction Commenting on Pearson’s Grammar of Science, Peirce says: “Professor Pearson ... tells us that each of us is like the operator at a central telephone office, shut out from the external world, of which he is informed only by senseimpressions.” (CP 8.144). Peirce found such a position untenable. However, this was neither because he believed that senses do not have a role to play in co...

Peirce (2007) proposed a two-stage conjunction detection model in which the outputs of first-stage neurons selective for the conjunction components were summed to give the conjunction-detector output. He argued that a saturating (monotonic) or supersaturating (nonmonotonic) nonlinearity on the outputs of the first-stage neurons made this detector more selective for conjunctions by increasing th...