Which condition is characterized by an impairment in skilled motor movements?

The condition characterized by an impairment in skilled motor movements is apraxia. Apraxia is specifically a neurological disorder that involves the inability to execute purposeful movements or to use objects correctly, despite having the physical ability and desire to perform the action. This impairment can manifest in various ways, such as difficulty in tasks involving fine motor skills, such as dressing, buttoning a shirt, or using tools.

Agnosia refers to the inability to process sensory information, leading to challenges in recognizing objects, people, or sounds, but it does not involve the physical execution of movements. Amnesia involves memory loss and does not pertain to motor skills. Neuroplasticity is the brain's ability to reorganize itself by forming new connections and is a general property of the brain, rather than a specific condition related to motor skills.

In summary, the defining features of apraxia focus on motor planning and the execution of movements, making it the correct choice when discussing impairment in skilled motor movements.