The table below shows the peak membrane potentials of a postsynaptic neurone under different stimulation conditions of a single presynaptic neurone. The resting membrane potential of the postsynaptic neurone is -70 mV.
| Occasion | Number of stimuli applied to presynaptic neurone | Time interval between successive stimuli (ms) | Peak membrane potential of postsynaptic neurone (mV) |
|---|---|---|---|
| 1 | 1 | N/A | -60 |
| 2 | 2 | 20 | -60 |
| 3 | 3 | 20 | -60 |
| 4 | 2 | 2 | -50 |
| 5 | 3 | 2 | +40 |
Which of the following explains these data?
spatial summation
temporal summation
saltatory conduction
inhibitory postsynaptic potentials
