Do you ever have trouble telling right from left? For example you’re taking a driving lesson and the instructor asks you to take a left turn and you pause, struggling to think of which way is left. If so, you’re not on your own – a significant proportion of our population has difficulty in telling right from left.
Left-right discrimination is a complex neuro-psychological process involving several higher neurological functions such as the ability to integrate sensory and visual information, language function and memory. For some it is second nature but for others a considerable challenge. You can take a test here to see how well you do.
One further problem facing the health profession is that when a doctor or nurse faces a patient, their right-side is on the patient’s left-side. So correctly distinguishing right from left in a patient also involves the visuo-spatial function of mentally rotating images.
Wrong turns to avoidable errors
It’s hardly the end of the world if you take the wrong direction on a journey, but there are many situations where confusing right from left can have devastating consequences. Some of the most tragic errors in medicine have been when surgery was performed on the wrong side of a patient: removing the wrong kidney or amputating the wrong leg. While there are systems, checks and balances in place to anticipate and minimise these kinds of mistakes, when they do occur, human error is often at the root of the cause.
The ‘distraction effect’
Error is an inherent characteristic of human behaviour – sometimes we just get things wrong – but left-right ones may be more than a one-off accident. Evidence would suggest that right-left confusion is more common in women. The literature would appear to suggest that men demonstrate a greater degree of visuo-spatial function.
Distinguishing right from left also never occurs in isolation. Hospitals and other health settings are busy and complex places to work in. Doctors are often subject to distractions while working; receiving telephone calls, cardiac monitors bleeping, taking questions from colleagues, patients and their relatives – the clinical environment can be very challenging.
In research we published in Medical Education, we explored the impact of such interruptions on medical students’ ability to correctly discriminate right from left. While objectively measuring 234 medical students’ ability to distinguish right from left, we subjected them to the typical ambient noise of a ward environment and interrupted them with clinical questions.