Purpose: Diagnostic reasoning literature debates the significance of “dual-process theory” and the importance of its constituent types of thinking: System-1and System-2. This experimental study aimed to determine whether novice medical students could be trained to utilize System-1 thinking when making diagnoses based on chest X-rays.
Method: Second-year medical students were recruited and presented with a series of eight online chest X-rays cases. Participants were shown half of the cases repeatedly during a training phase and the other half only twice. During the final test phase, they were shown all eight cases, providing a diagnosis as a free text answer. Dependent variables were diagnostic accuracy and response time.
Results: Thirty-two students participated. During the test phase, students responses were significantly more accurate and faster for cases which had been seen repeatedly during the training phase (mean score = 3.56/4, mean time = 2.34 s) compared with cases which had been seen only twice (mean score = 1.59/4, mean time = 7.50 s).
Conclusion: This study demonstrates that it is possible to induce in novice students the speed-to-diagnosis and diagnostic accuracy typical of System-1-type reasoning. The full experimental design and the chest X-rays used may provide new opportunities to explore some of the issues surrounding dual-process theory.

dx.doi.org/10.1080/0142159X.2017.1418502, hdl.handle.net/1765/104686
Medical Teacher
The institute of Medical Education Research Rotterdam

Rosby, L.V. (Lucy Victoria), Rotgans, J.I, Tan, G. (Gerald), Low-Beer, N. (Naomi), Mamede, S, Zwaan, L, & Schmidt, H. (Henk). (2018). Inducing System-1-type diagnostic reasoning in second-year medical students within 15 minutes. Medical Teacher, 1–6. doi:10.1080/0142159X.2017.1418502