Which disorder involves symptoms of altered motor or sensory function with no medical basis?

The disorder defined by symptoms of altered motor or sensory function that cannot be medically explained is Conversion Disorder. In this condition, individuals experience significant neurological symptoms such as weakness, paralysis, or sensory disturbances—such as loss of vision or numbness—that are inconsistent with any known medical condition. The hallmark of Conversion Disorder is that these symptoms are not intentionally produced or feigned, distinguishing them from certain other disorders where symptoms may be intentionally generated, like factitious disorder.

The symptoms typically cause significant distress or impairment in social or occupational functioning. Conversion Disorder is often thought to occur as a psychological response to stress or trauma, where psychological conflicts manifest as physical symptoms. This mind-body interaction illustrates how a psychological issue can lead to real and observable physical symptoms without a biological cause.

The other options currently provided involve different presentations of distress that are not categorized as alterations in neurological function without medical basis, making Conversion Disorder the correct choice.