have an impact = influence
placebo [pləˈsiːbəʊ]= a medicine or procedure prescribed for the psychological benefit to the patient rather than for any physiological effect
placebo group = a group that receives what, to them, appears to be a treatment, but actually is neutral and does not contain any active treatment (e.g., a sugar pill in a medication study)
recall = remember
cognitive performance = a measure of how well a brain functions, it includes things like attention span, memory, reaction time, problem-solving ability
human trial = research studies performed in people that are aimed at evaluating a medical, surgical, or behavioral intervention
detrimental = tending to cause harm
impaired = weakened or damaged
Alzheimer's [ˈɔːltshaɪmərz] disease = the most common type of dementia