Moving window generator for reading experiments


An inexpensive PC-based moving window generator with an eye movement recording system is described. The moving window technique, activated by current eye movements, has an advantage over the fixed window technique in measuring the effective visual field size during reading. A variable rectangular window, through which the subject observes the text, is generated on a PC-controlled CRT screen. The system includes a frame buffer memory, an analog-to-digital conversion unit, and an eye movement recording system. The system works well for measuring approximate field size during reading.

This work was supported in part by Grants in Aid 01510061, 03401003, 03801010, and 03551002 to N.O. from the Ministry of Education, Japan. Thanks are due Hitoshi Tsuji and Hiroshj Ashida for their help in computer programming.