“…Individual differences in the ability to perceive simple dimensional relationships is a fundamental process which has been 12-3 studied by many authors in the areas of attention, perception, and cognition (e.g., Gibson, 1969;House, 1979;Tighe & Tighe, 1979;Tversky, 1977;Zeaman, 1978). In fact, the ability to recognize and use simple dimensional relationships is often cited as the primary building block for concept foma-ion, categorization, and reasoning (e.g., Medin, 1983;Offenbach, 1983;Smith, 1989;Rumelhardt, 1989).…”