The phrase "a certain stimulus" is correct and usable in written English.
It can be used when referring to a specific stimulus that is not explicitly identified or when discussing a particular type of stimulus in a general context.
Example: "In the experiment, the researchers introduced a certain stimulus to observe its effects on the participants' reactions."
Alternatives: "a specific stimulus" or "an unspecified stimulus".
How do we become conscious of a certain stimulus, or indeed "conscious" at all?
If, say, there was an unpleasant association with a certain stimulus, then the machine could choose a different response.
People learn to describe their mental states, according to Skinner, from the utterances of others who ascribe those states to them on the basis of observations of their behaviour (e.g., in the social context or when a certain stimulus situation prevails in their environment).
Such averaging might result in misinterpretations when only individual cells within a population respond to a certain stimulus.
It would stem from the differences in the suitability of the modalities for the perceptual coding of a certain stimulus feature [21].
But when a government and an administration force a certain stimulus and flood the market with money and make decisions to force the mortgage market down to 5%, stability is lost.
On the other hand, dynamic properties of a neuron sometimes make it respond in an amplified way to certain stimulus profiles.
One can see that the probability bound method is the most restrictive of the three in assessing whether a neuron responds to certain stimulus.
Higher animals, including humans, commonly learn novel behaviors via trial and error, by evaluating retrospectively whether an action performed under certain stimulus conditions yielded desirable outcomes.
How to design intelligent carriers for delivering drugs to the target accurately and releasing drug timely with the help of a certain environmental stimulus is still a challenge in tumor treatment.
In the field of biomedicine, stimuli-responsive drug delivery systems (DDSs) have become increasingly popular due to their site-specific release ability in response to a certain physiological stimulus, which may result in both enhanced treatment outcome and reduced side effects.
