THIS PAPER IS AN EXPLORATION OF THE DEGREE TO WHICH THE COGNITIVE CAPACITIES OF HUMAN BEINGS, AS DELINEATED BY PSYCHOLOGY, ARE SEEN TO BE CONGRUENT WITH THE FINDINGS OF LINGUISTIC RESEARCH, AND SOME SPECULATIONS ABOUT THE POSSIBLE IMPLICATIONS FOR LINGUISTIC RULES THAT MAY BE DISCOVERED THROUGH AN EXAMINATION OF PSYCHOLOGICAL PERFORMANCE. IT IS SHOWN THAT THREE KINDS OF BEHAVIOR WHICH ARE IMPORTANT AND CHARACTERISTIC OF HUMAN BEINGS ARE FAITHFULLY REFLECTED IN LANGUAGE UNIVERSALS, I.E., THE "I-OTHER" DISTINCTION, ANALOGIZING AND EXTRAPOLATING FROM EVENT TO OTHERS, AND THE NATURE OF OUR PERCEPTIONS OF PHYSICAL SIGNALS FROM THE REAL WORLD. IT IS SUGGESTED THAT THE NATURE OF HUMAN INTELLECTUAL CAPACITIES MAY IMPLY CERTAIN KINDS OF CONSTRAINTS ON STATEMENTS OF STRUCTURAL AND GENERATIVE RULES WHICH CAN PROFITABLY BE ATTRIBUTED TO A LANGUAGE. EVIDENCE IS PRESENTED THAT SUPPORTS THE NOTION THAT WE MAKE SIMULTANEOUS GRAMMATICAL, SEMANTIC, AND PHONOLOGICAL DECISIONS DURING ENCODING AND DECODING OPERATIONS, AND THAT DECISIONS ON ANY ONE LEVEL APPEAR TO INFLUENCE THOSE ON THE OTHERS. THIS PAPER WAS PRESENTED AT THE MEETING OF THE UNIVERSITY OF MICHIGAN LINGUISTICS CLUB, ANN ARBOR, MARCH 16, 1967, AND ALSO APPEARS IN "STUDIES IN LANGUAGE AND LANGUAGE BEHAVIOR, PROGRESS REPORT V," SEPTEMBER 1, 1967. (AUTHOR/AMM)