This paper examines the endorsement of four types of cultural patterns across America, Japan, and Thailand, as well as how these cultural patterns predict the emotional valence (positive-negative) of intrapersonal communication. Within-subjects tests revealed that the American sample endorsed horizontalism more than verticalism, while the Thais endorsed horizontal collectivism the most and vertical collectivism the least. The Japanese sample reported significantly more horizontal collectivism than any other cultural pattern, and significantly less vertical individualism. Across cultures, the Americans reported comparatively higher levels of horizontal individualism than did the Japanese and then the Thais. The Thais endorsed horizontal collectivism less than those in the USA and Japan. Finally, the Japanese comparatively endorsed vertical collectivism more than the Americans, followed by the Thais. For intrapersonal communication affect, horizontal collectivism predicted positive emotional affect in Thailand and Japan, while vertical collectivism was negatively related to affect in Thailand.