Final answer:
Cultural differences most significantly affect communication and interaction norms, along with personal values and behaviors, such as language use, conversational etiquette, visual perception, personality traits, and career choices.
Step-by-step explanation:
The factor most likely to be affected by cultural differences is communication, including language and conversational etiquette. Cultures vary widely in their norms for standing proximity during conversation, preferences for beverages, eating habits, and interpretations of visual stimuli. For instance, Japanese individuals may pay more attention to context in visual scenarios compared to Americans.
Additionally, cultural variance influences personality traits, with collective societies displaying lower levels of extroversion, while other cultures may score higher on openness or neuroticism. This highlights the importance of considering culture when evaluating psychological constructs or even when making career choices—where cultural expectations can shape education and professional paths.