1.4 Definition of Stimulus
Before we get started, let’s briefly review some terms with which you should already be familiar. The first is stimulus, which can be defined as a physical energy change capable of affecting an organism through one of its sensory receptors or free nerve endings.
| Term | Definition |
|---|---|
| Stimulus | A physical energy change capable of affecting an organism through one of its receptors: photoreceptors, phonoreceptors, chemoreceptors (gustatory and olfactory), mechanoreceptors (touch), thermoreceptors, and free nerve endings. |
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