Cognitive Reflection Test (CRT) Practice

Which findings would support a diagnosis of Parkinson disease?

1. Intentional tremors

2. Masklike facial expression

3. Normal reflexes

4. Improved motor coordination

The correct answer is: Masklike facial expression

A masklike facial expression, also known as hypomimia, is a hallmark symptom of Parkinson's disease. This characteristic is due to the loss of facial muscle control associated with the disease, which results in reduced expressiveness and an overall rigid appearance. Patients exhibiting this symptom often show less movement in their facial muscles, contributing to a flat or "mask-like" look, which is specifically associated with Parkinson's. In contrast, intentional tremors, which refer to tremors that occur with purposeful movement, are not typical of Parkinson's disease but may be associated with other conditions such as essential tremor or cerebellar disorders. Normal reflexes can occur in individuals with Parkinson’s; however, abnormalities like bradykinesia or rigidity are more diagnostic. Lastly, improved motor coordination is unlikely in Parkinson's patients, who generally experience a decline in this area as the condition progresses. These aspects highlight why the masklike facial expression is a key support for a diagnosis of Parkinson's disease.