UNDERSHOOT By N., Pam M.S. - April 29, 2013 noun. the part of an action potential which symbolizes the phase when the membrane potential is temporarily hyperpolarized relative to the resting potential. UNDERSHOOT: "You'll need to define the undershoot within each of the examples listed." Related Psychology Terms OVERSHOOT DENDRITIC POTENTIAL NERVE IMPULSE PREFERENCE VOLTAGE-GATED ION CHANNEL POLARIZED MEMBRANE TRANSDUCTION STIMULATION EFFECTS NEUROTRANSMITTER POSITIVE AFTERPOTENTIAL Cite this page: N., Pam M.S., "UNDERSHOOT," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/undershoot/ (accessed April 13, 2021).