A 40-year-old woman presents with a 2-month history of weakness in her right arm. She reports that the weakness began suddenly after a minor car accident, where she was not injured but felt very shaken. She denies pain, sensory changes, or other neurological symptoms. On examination, there is give-way weakness in the right arm, but reflexes, sensation, and muscle tone are normal. There are no signs of atrophy, and electromyography (EMG) studies are unremarkable.Which of the following findings would most likely support a diagnosis of Conversion Disorder?
