From lisp machine to language lab

A general method is described for using a Lisp Machine to study reading as it takes place. The method involves simulating, on the machine’s CRT, a moving window that passes through the text being read. The speed and direction of the window can be controlled by the reader, or test probes can be coordinated within the text viewed. The method allows reading to occur in an easily monitored environment, and the reader can respond to the material being read in a flexible manner. Suggestions for programming the Lisp Machine are provided which lead to improved overall execution speed and constancy of runtime for specific pieces of code in on-line experiments.