Averaged evoked potentials in relation to attitude, mental load and intelligence. Paper presented at the Symposium held in Amsterdam, September 1969, sponsored by the International Ergonomics Association.

Besides the quantitative aspect of mental load, there is the qualitative aspect, that is the nature of processed information. The ability to filter out non-pertinent information is a necessary condition for an optimum use of the processor, working at a given level of intensity. The author states that performance measures, operator interviews and electrophysiological records are complementary methods.