Final answer:
The principal psychological factor for interview success is managing one's nonverbal communication and making a positive first impression, which can be improved through practice and awareness.
Step-by-step explanation:
The principal psychological factor contributing to a successful interview or interrogation is awareness of one's behavior and its impact on the interviewer. This includes understanding and managing nonverbal communication and making a positive first impression. Nonverbal cues, such as hand gestures, head nodding, and smiling, play a crucial role in the interview process. Furthermore, psychological research indicates that attributes like conscientiousness, openness to new experiences, and extroversion, which can be conveyed through both visual and vocal cues, positively affect an interviewer's judgment.
To enhance interview success, candidates should practice interviews to become conscious of their nonverbal behavior and solicit feedback to improve. Practicing helps in projecting confidence and positive personality traits, which are essential during the interview. Ultimately, a successful interview largely depends on creating authentic and positive interactions, similar to a well-conducted conversation.