threshold stimulus


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Related to threshold stimulus: subthreshold stimulus, maximal stimulus

stimulus

 [stim´u-lus] (L.)
any agent, act, or influence that produces functional or trophic reaction in a receptor or an irritable tissue.
conditioned stimulus a stimulus that acquires the ability to evoke a given response by repeatedly being linked with another stimulus that naturally evokes that response; see also conditioning.
depolarizing stimulus a stimulus that lowers the resting potential, making the inside of a fiber less negative. In cardiac fibers this means bringing the resting potential from −90 mV to −70 mV.
discriminative stimulus a stimulus associated with reinforcement, which exerts control over a given type of behavior; the subject must discriminate between closely related stimuli and respond positively only with this particular stimulus.
eliciting stimulus any stimulus, conditioned or unconditioned, that elicits a response.
threshold stimulus a stimulus that is just strong enough to elicit a response.
unconditioned stimulus any stimulus that naturally evokes a specific response; see also conditioning.

thresh·old stim·u·lus

a stimulus of threshold strength, that is, one just strong enough to excite.
See also: adequate stimulus.
Synonym(s): liminal stimulus

threshold stimulus

Etymology: AS, therscold + L, stimulare, to incite
a stimulus that is just sufficient to produce a response. Below that level, no action or response is likely without additional intensity of the stimulus. Also called limen, liminal stimulus.

thresh·old stim·u·lus

(thresh'ōld stim'yū-lŭs)
A stimulus of threshold strength, i.e., one just strong enough to excite.
See also: adequate stimulus

thresh·old stim·u·lus

(thresh'ōld stim'yū-lŭs)
Stimulus of threshold strength, i.e., one just strong enough to excite.

stimulus

pl. stimuli [L.] any agent, act, or influence that produces functional or trophic reaction in a receptor or an irritable tissue.

conditioned stimulus
a neutral object or event that is psychologically related to a naturally stimulating object or event and which causes a conditioned response. See also conditioning.
discriminative stimulus
a stimulus associated with reinforcement, which exerts control over a particular form of behavior; the subject discriminates between closely related stimuli and responds positively only in the presence of that stimulus.
eliciting stimulus
any stimulus, conditioned or unconditioned, which elicits a response.
stimulus generalization
in learning by animals stimuli tend to be grouped together, the reactions lacking the discrimination of the higher mammals.
stimulus response coupling
coupling of the neural or endocrine stimulus to the cellular response.
structured stimulus
a well-organized and unambiguous stimulus, the perception of which is influenced to a greater extent by the characteristics of the stimulus than by those of the perceiver.
threshold stimulus
a stimulus that is just strong enough to elicit a response.
unconditioned stimulus
any stimulus that is capable of eliciting an unconditioned response. See also conditioning.
unstructured stimulus
an unclear or ambiguous stimulus, the perception of which is influenced to a greater extent by the characteristics of the perceiver than by those of the stimulus.