![Carrier strike group screen commander](https://loka.nahovitsyn.com/131.jpg)
![keystrokes per second test keystrokes per second test](https://i3.ytimg.com/vi/PpGqjA8ZxQE/hqdefault.jpg)
Each word was preceded by a “whole” cue ( Both) that told them to type all letters using both hands, as in normal typewriting, or a “hand” cue ( Left or Right) that told them to type only the letters assigned to one hand. Typists typed single words presented on a screen. Logan and Crump ( 2009) speculated that vision was important, but they did not assess its role directly. Thus, typing speed is slower and the error rate is higher when typists must type only the letters assigned to one hand.įor this article, we assessed the role of vision in monitoring the hands to inhibit inappropriate keystrokes by covering the hands and keyboard while typists typed only the letters assigned to one hand. If lower-level processes are not slow enough, higher-level processes may fail to inhibit inappropriate keystrokes. Lower-level processes must slow the rate at which keystrokes are struck to allow higher-level processes enough time to see the keystrokes and inhibit them before they are struck (Logan, 1982). They must discover it by watching the hands as they type and inhibit inappropriate keystrokes as they occur. Logan and Crump ( 2009) suggested that typing only letters assigned to one hand is disruptive because higher-level processes do not know which hand types which letter. Making implicit knowledge explicit is costly because lower-level processes must change to allow higher-level processes to access the details. A popular resolution to these paradoxes is to propose that skills are controlled hierarchically, with the processing of explicit knowledge occurring at higher levels and the processing of implicit knowledge at lower levels (Lashley, 1951 Logan & Crump, 2011 Shaffer, 1976).
![Carrier strike group screen commander](https://loka.nahovitsyn.com/131.jpg)