Many audiologists notice that the benefits that patients’ field experience with directional microphones differs from controlled test environments, particularly laboratory environments. In this 2004 article Cord and colleagues provide some insight into these differences that are observed in the lab and real-world.
Cord, M., Surr, R., Walden, B. & Dyrlund, O. (2004). Relationship between laboratory measures of directional advantage and everyday success with directional microphone hearing aids.Journal of the American Academy of Audiology 15, 353-364.