THE PURPOSE OF THE EXPERIMENT WAS TO DETERMINE THE DEGREE TO WHICH PHYSIOLOGICAL AROUSAL, AS INDEXED BY THE GRASON STADLER TYPE OPERANT CONDITIONING APPARATUS (GSR), IS RELATED TO THE ACCURACY OF LOGICAL REASONING. THE STIMULI WERE 12 SYLLOGISMS, THREE OF EACH OF FOUR DIFFERENT LOGICAL FORMS. THE 14 SUBJECTS (SS) INDICATED THEIR AGREEMENT OR DISAGREEMENT WITH EACH OF THE PREMISES AND WITH THE CONCLUSION OF EACH SYLLOGISM, WHILE CONTINUOUS GSR RECORDINGS WERE TAKEN. NO RELATION BETWEEN GSR AND ACCURACY OF LOGICAL INFERENCE WAS FOUND. HOWEVER, PERSONAL OPINION APPEARS TO BE SIGNIFICANTLY RELATED TO SUCH JUDGMENTS. IF S AGREES WITH AN ITEM AND DECLARES IT VALID, OR DISAGREES WITH IT AND CALLS IT INVALID, SHE IS MORE LIKELY TO BE LOGICALLY INCORRECT THAN IF HER OPINION AND HER JUDGMENT OF VALIDITY WERE NOT CONGRUENT. THIS RESEARCH REPORT IS ONE OF SEVERAL WHICH HAVE BEEN SUBMITTED TO THE OFFICE OF EDUCATION AS "STUDIES IN LANGUAGE AND LANGUAGE BEHAVIOR," PROGRESS REPORT 5, SEPTEMBER 1, 1967. (AUTHOR)