Which programming parameter most directly affects the perceived strength of stimulation?

Which programming parameter most directly affects the perceived strength of stimulation?

• A. Pulse width
• B. Frequency
• C. Electrode count
• D. Amplitude

Answer: (D)

Stimulation strength is set primarily by the amplitude, the current level delivered with each pulse. This amplitude directly determines how much charge crosses into the tissue with every pulse, which in turn controls how many nearby nerve fibers are activated. Higher amplitude expands the electric field and recruits more fibers, making the sensation feel stronger. Lower amplitude reduces activation and softens the percept. Pulse width, while it influences the total charge per pulse, does so in conjunction with amplitude, and patients often perceive changes in strength more strongly when amplitude is adjusted. Frequency changes how often pulses occur over time, shaping the temporal pattern and comfort of the sensation rather than its immediate intensity. Electrode count affects how the stimulation spreads across tissue and which areas feel it, not the instantaneous strength of the sensation at a given site.

Stimulation strength is set primarily by the amplitude, the current level delivered with each pulse. This amplitude directly determines how much charge crosses into the tissue with every pulse, which in turn controls how many nearby nerve fibers are activated. Higher amplitude expands the electric field and recruits more fibers, making the sensation feel stronger. Lower amplitude reduces activation and softens the percept.

Pulse width, while it influences the total charge per pulse, does so in conjunction with amplitude, and patients often perceive changes in strength more strongly when amplitude is adjusted. Frequency changes how often pulses occur over time, shaping the temporal pattern and comfort of the sensation rather than its immediate intensity. Electrode count affects how the stimulation spreads across tissue and which areas feel it, not the instantaneous strength of the sensation at a given site.