What factor does NOT help improve lipreading?

The factor that does not help improve lipreading is related to environmental acoustics. Lipreading primarily relies on visual cues from the speaker's mouth movements and facial expressions rather than auditory information. While good environmental acoustics can enhance hearing and the ability to listen, they do not directly facilitate the ability to read lips because lipreading is a visual skill.

On the other hand, being familiar with the topic allows a person to anticipate certain words or phrases, improving understanding through context. Stress levels can negatively impact concentration and focus, making lipreading more challenging, while appropriate amplification can aid communication for those who also rely on residual hearing. Each of these factors directly influences either the visual or cognitive process of interpreting speech, whereas environmental acoustics, while important for general communication, does not enhance the specific skill of lipreading.