Spatial summation occurs when __________.

• A. multiple local potentials occur at the same synapse on a cell
• B. an EPSP from one terminal is activated several times in rapid order
• C. multiple local potentials occur at different places on the same cell at the same time
• D. multiple local potentials occur at different times in the same cell

Answer: (C)

Verified step by step guidance

1. Understand the concept of spatial summation: It refers to the process by which multiple local potentials (synaptic inputs) occur at different locations on the same neuron simultaneously, leading to a cumulative effect that can trigger an action potential.
2. Identify the key elements of spatial summation: It involves multiple synapses on the same neuron being activated at the same time, which can increase the likelihood of reaching the threshold needed for an action potential.
3. Differentiate spatial summation from temporal summation: Temporal summation involves multiple signals at the same synapse occurring in rapid succession, whereas spatial summation involves signals from different synapses occurring simultaneously.
4. Consider the physiological significance: Spatial summation allows neurons to integrate information from various sources, enhancing the complexity and responsiveness of neural processing.
5. Apply this understanding to the problem: Recognize that the correct answer involves multiple local potentials occurring at different places on the same cell at the same time, which aligns with the definition of spatial summation.