Table 1.

List of Inclusion Criteria, Search Terms Associated with Each Criterion, and Corresponding Exclusion Criteria

Inclusion Criteria	Search Terms	Exclusion Criteria
Randomized controlled trials	Clinical trial or randomized trial or controlled trial or longitudinal or treatment or rehabilitation	No control group. Lack of age-matched and mental status matched control group. Participants were not randomly assigned to each group.
Human participants with mean age over 60	Age or aged or ageing or aging or age difference or older adults or elderly or seniors	Non-human animal studies. Training studies focusing on participants from other stages of life-span, such as younger adults and children.
Patients with mild cognitive impairment	Mild cognitive impairment or MCI or memory complains or memory loss	Inclusion of participants with other neuropsychological disorders, such as possible Alzheimer’s disease or schizophrenia.
Cognitive intervention or training focusing on one or more cognitive domains	Cognitive intervention or cognitive training or rehabilitation or cognitive stimulation or mnemonic training or memory training or executive functions training or computerized training or video game training or speed of processing training or working memory training or engagement	Intervention effects could not be attributed just to cognitive training, such as training that combined physical or pharmacological interventions with cognitive training.