As you can see, the field of cognitive psychology is both broad and diverse, yet it touches on so many aspects of daily life. Research on cognitive psychology may at times seem academic and far-removed from the problems you face in everyday life, yet the findings from such scientific investigations play a role in how professionals approach the treatment of mental illness, traumatic brain injury, and degenerative brain diseases. Thanks to the work of cognitive psychologists, we can better pinpoint ways to measure human intellectual abilities , develop new strategies to combat memory problems, and decode the workings of the human brain—all of which ultimately has a powerful impact on how we treat cognitive disorders.
Patients with Alzheimer's disease (AD) , the most common form of dementia, have been studied extensively as far as priming goes. Results are conflicting in some cases, but overall, AD patients show decreased priming effects on word-stem completion and free association tasks, while retaining normal performance on lexical decision tasks .  These results suggest that AD patients are impaired in any sort of priming task that requires semantic processing of the stimuli, while priming tasks that require visuoperceptual interpretation of stimuli are unaffected by Alzheimers.