A study was made of effects of two different leadership treatments on perception of nonverbal stimuli relating to concepts of leaders, authority, and cohesion as measured by changes in the Semantic Differential Scale. Subjects (28 Yaqui Indian and Mexican-American members of the Neighborhood Youth Corps) were randomly assigned to an autocratic group, with closely specified tasks and goals and little interaction, or a democratic group, marked by emphasis on interaction among youth and with the leaders, with leadership evolving from the group. Stimuli consisted of color slides on ten concepts or roles (doctor, judge, nurse, and others) representing leaders, authority, and cohesion. Based on findings, it was concluded that perceptions of nonverbal stimuli can be changed following a leadership treatment, and that the democratic treatment is preferable. However, the experimental design and other circumstances created doubt whether leadership was the sole influence. (Included are the concept slides, test materials, seven tables, and a bibliography.) (Author/ly)