The phrase "a certain behaviour" is correct and usable in written English.
It can be used when referring to a specific type of behaviour without naming it directly, often in a context where the behaviour is understood or implied.
Example: "The study focused on a certain behaviour that was prevalent among teenagers during the summer months."
Alternatives: "a particular behaviour" or "a specific behaviour".
"I think city life encourages a certain behaviour – not a behaviour I like.
"My parents, even before I started doing this, were the kind of parents who expected a certain behaviour and focus in life.
We introduced a mega economic technology called capitalism which brings with it a structure and imposes a certain behaviour on society.
The discovery of genes for a certain behaviour, for schizophrenia, for happiness, always get good press coverage, usually based on publication in a respected scientific journal such as Science or Nature.
"And I think if on isolated occasions managers, they lose their emotional control and they have a certain behaviour that cannot be accepted by the authorities, in this case by the refs, I think we should be punished.
This creates a particular challenge for the clinician who has to decide whether a certain behaviour, which might be inconsistent or incomplete, reflects a conscious or an unconscious process.
When we talk about "intelligence" we are describing behaviour, or a propensity towards certain behaviour, and not the exercise of some disembodied intellect.
Whilst, some realize that people can not be blamed or held responsible for their actions, none of them deny the effectiveness of a system where certain behaviour is rewarded and other behaviour is punished.
Whether an individual performs certain behaviour or expresses emotions that were mirrored (e.g. from the God-image) depends on the context.
Personality should be regarded as a predisposition and not as a fixed prediction of certain behaviour, because we usually adapt our actions depending on the existing social or environmental situation or emotional state.
"Students of media and communications will tell you there's no such thing as neutral technology, that it's too simplistic to say technology is just a tool used for good or for bad, because the actual design of a service can encourage certain behaviour".
