Final answer:
Consistent hyper-reflexivity on one side of the body suggests an Upper Motor Neuron Lesion, which is characterized by strong deep tendon reflexes and spasticity, not Lower Motor Neuron Lesion, which shows reduced reflexes and flaccid paralysis.
Step-by-step explanation:
If one side of the body is consistently hyper-reflexive, we should think Upper Motor Neuron (UMN) Lesion. Signs indicating a UMN lesion include strong deep tendon reflexes, spasticity, and hyper-reflexia, which are part of the body's excessive response to stimuli. In contrast, a Lower Motor Neuron (LMN) Lesion would present with symptoms such as flaccid paralysis, muscle atrophy, and reduced or absent deep tendon reflexes. The condition specified in the question aligns with the characteristics of an UMN lesion since hyper-reflexivity and spasticity are indicative of problems with the motor neurons that originate in the cerebral cortex and control the LMN, which in turn directly innervate skeletal muscles.