Which of the following signs would indicate normal activity in the primary sensory cortex following a stroke?

In the context of assessing normal activity in the primary sensory cortex following a stroke, maintaining proprioceptive feedback is the correct indication of preserved function. The primary sensory cortex is responsible for processing various sensory modalities, including touch, pain, and proprioception, which provides the brain with information about body position and movement.

If proprioceptive feedback remains intact, it suggests that the primary sensory cortex is still functioning adequately in that specific area responsible for sense of body position and movement. This preservation indicates that not all sensory pathways have been affected by the stroke, implying some degree of normalcy in sensory processing.

In contrast, loss of fine touch sensation and inability to feel pain on the contralateral side would suggest damage to the pathways that transmit these specific sensory modalities. Additionally, an impaired ability to perform two-point discrimination indicates a disruption in the ability to distinguish between two close stimuli, also pointing toward dysfunction in the primary sensory cortex. Therefore, maintaining proprioceptive feedback is a sign of normal activity in the primary sensory cortex even after a stroke.