The frontal lobe contains most of the dopamine-sensitive neurons in the cerebral cortex. The dopamine system is associated with reward, attention, short-term memory tasks, planning, and motivation. Dopamine tends to limit and select sensory information arriving from the thalamus to the forebrain.
Na + concentration is lowered, indicating that Na + in-flux is responsible for the rising phase of the action po-tential. Their data also suggested that the falling phaseof the action potential was caused by a later increase inK+ permeability.
- active conduction (i.e. generating an action potential) means signal travels along nerve with NO loss of amplitude. Figure 21-2. Lodish 4th edition (a) An action potential is a sudden, transient depolarization of the membrane followed by repolarization to the resting potential of about -60 mV.