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.
Answers. 1  A cation is a positive ion (Na+), it is usually a metal, it is on the left side of a compound, and will normally form a base with the hydroxide ion and one such example is NaOH (Sodium Hydroxide). Hydrogen is an exception to the rule that metals are cations because it has a +1 charge.