Receptive Fields

At the top of the figure are some receptors. Below them are two kinds of synapses (neural connections): Excitation synapses are ones that increase neural activity and inhibitory synapses decrease neural activity.

The concentric circles represent the neural activity recorded with the electrode. when the receptors are stimulated with light. When one or all of the center receptors are stimulated an excitatory increase in neural activity is obtained at the electrode. When the receptors labeled surround are stimulated an inhibitory decrease in neural activity is obtained.

A more detailed explanation is available elsewhere in this book.

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