Introductory Concepts
Elementary Relationships
Extensions of Verbal Behavior
Multiple Controlling Relationships
Building on the Elementary Relationships
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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.

TermDefinition
StimulusA 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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Stimulus is physical energy being. It is through one or more the five senses.

stimulus is a physical change.

Stimulus is a physical change, one that is capable of affecting sensory receptors or nerve endings.

Stimulus= a physical energy change capable of affecting one through one of the 5 sensory receptors

Stimulus can also be unconditioned and conditioned.

Emitted through the five senses

Stimulus is a physical energy change and it affects organisms through sensory receptors.

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.

A stimulus is a physical change.

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