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When a neuron sends an inhibitory message to another neuron, the change in the postsynaptic neuron is called an "
inhibitory postsynaptic potential" (IPSP). IPSPs make it less likely that the membrane potential at the axon hillock will reach "threshold" and thus the postsynaptic neuron is not likely to fire and
send a message to other neurons. When the IPSP dissipates, the membrane potential returns to "resting potential" (normal). In the animation below, the presynaptic neuron will produce an IPSP (represented by
the color "red") in the postsynaptic neuron. Click on the "Play" button to see the animation. You must click on the "Rewind" button before you can replay the animation. |
