What TCL change would prompt remapping of the activation map?

What TCL change would prompt remapping of the activation map?

• A. 5%
• B. More than 10%
• C. 30%
• D. No change

Answer: (B)

Activation maps depend on the threshold current level (TCL) needed to activate a site. If the TCL shifts, the set of sites that meet activation changes, so the map should be updated to reflect the new pattern. The trigger is a change in TCL that is substantial enough to indicate a real shift in excitability—typically defined as more than about 10% from the baseline. Changes smaller than that, such as around 5%, are usually within normal variability and don’t mandate remapping. A large shift, like 30%, certainly qualifies, but the rule is the threshold: any change exceeding 10% prompts remapping.

Activation maps depend on the threshold current level (TCL) needed to activate a site. If the TCL shifts, the set of sites that meet activation changes, so the map should be updated to reflect the new pattern. The trigger is a change in TCL that is substantial enough to indicate a real shift in excitability—typically defined as more than about 10% from the baseline. Changes smaller than that, such as around 5%, are usually within normal variability and don’t mandate remapping. A large shift, like 30%, certainly qualifies, but the rule is the threshold: any change exceeding 10% prompts remapping.