On-line,real-time recording of eye orientation using the corneal reflection method

The orientation of a subject’s eyes can be automatically sampled in real time at 60 Hz using Mackworth’s corneal reflection method, a closed circuit TV system with a brightness-amplitude trigger, and a minicomputer. The organization of the electronic interface and software (for recording and behavioral control) is described, along with the characteristics of the recording system and potential sources of artifact. Sample calibration and experimental data are presented.