Using a participant's first language (L1) in intervention is beneficial for what purpose?

Using a participant's first language (L1) during intervention is particularly beneficial for promoting comfort and understanding. When therapy is conducted in a participant’s native language, it creates an environment where they feel more at ease, allowing them to express themselves fully and engage more effectively in the therapeutic process. This comfort can significantly enhance communication and trust between the participant and therapist, leading to better outcomes.

Furthermore, using L1 helps ensure that the participant fully comprehends the concepts and strategies being introduced during intervention. This is critical for effective learning and retention of information. By leveraging the participant's proficiency and familiarity with their first language, clinicians can facilitate a more supportive and effective therapeutic experience.

The other options focus on different aspects, such as simplification, expediting assessments, or increasing variability in testing. However, these do not capture the primary benefit of fostering a sense of comfort and clear understanding, which is essential in any intervention for effective communication and engagement.