Postsynaptic potentials (PSPs) are temporary changes in the electrical potential of a neuron. They occur when neurotransmitters released from presynaptic neurons attach to postsynaptic neurons, resulting in a change in the neuron’s electrical potential. The potential can be either excitatory or inhibitory. An excitatory potential excites the neuron, causing depolarization and potentially triggering an action potential. An inhibitory potential inhibits the neuron, resulting in hyperpolarization, which inhibits the postsynaptic neuron and reduces the likelihood of the neuron firing.