A quick web search (I have never heard of ABA) tells me that there are three main points to consider
Antecedent – The prompt, or initial situation, leading to a behavior.
Behaviour – The action or behavior in response to the antecedent.
Consequence – The reinforcement mechanism associated with the behavior.

The basic principle of looking for the cause of unwanted behaviours is common in good dementia units, it is common knowledge that triggers like pain, boredom, anxiety or some other unmet need can cause those with dementia to act inappropriately. I think the focus has to be on removing the triggers since the expectation to learn through positive reinforcement is likely beyond most of those with dementia.
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Reply to cwillie

ABA is not routinely used with dementia. However, there are ongoing studies using ABA for dementia patients with aggressive behaviors.
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Reply to anonymous439773

From what I understand about ABA and dementia - ABA is irreverent for dementia patients. One of the defining characteristics of dementia is a dis-functioning brain that cannot learn new behaviors - or even continue/repeat previously learned behaviors.
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Reply to TNtechie

I’ve asked a doctor about that once before. But, didn’t get a clear answer.

I know now it is used successfully to help people with disabilities.

If if you have the knowledge/skills, I think it would be well worth giving it a try.

Although my Mom’s short term memory is gone, she is able to learn new things - given enough time and repetition. She can even change/adapt her behavior, but it is not consistent.

I think the fluid nature of the brain in dementia is what would be most challenging. Hour by hour and minute to minute, the brain seems to be unpredictable in people with dementia.
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Reply to Gardens