Development and Evaluation of a Psychological Intervention in Videogame Format for the Promotion of Active Aging

This will be measured with the General Health Questionnaire (GHQ-12; Goldberg \& Williams,1988; Spanish version by Rocha et al., 2011). This self-administered questionnaire consists of 12 items and assesses emotional distress. The person evaluates each item based on their emotional distress using a Likert scale with four response options ranging from "better than usual" to "much worse than usual," which are scored using a bimodal response scale (0, 0, 1, 1). The total score ranges from 0 to 12, with higher scores indicating greater emotional distress. The internal consistency (Cronbach's alpha) is .86 for people under 65 and .90 for people 65 and older.

Depressive symptoms as measured by the Center for Epidemiological Studies Depression Scale (CES-D; Radloff, 1977; Spanish version by Vázquez et al., 2007). This 20- item scale is self-administered and assesses depressive symptoms. The person evaluates each item based on how often they have experienced it in the last week using a Likert scale with four response options ranging from 0 (rarely or none of the time) to 3 (most of the time). The total score ranges from 0 to 60, where higher scores correspond to greater depressive symptomatology. Internal consistency (Cronbach's alpha) of the scale is .89.

To evaluate the reinforcement, we will use the Environmental Reward Observation Scale (EROS; Armento \& Hopko, 2007; Spanish version by Barraca \& Pérez-Álvarez, 2010). It is a self-administered 10-item scale that assesses the degree of positive reinforcement contingent on the response received from the media. Each item is evaluated based on the degree to which the individual believes applies to them, according to a Likert scale with four response options ranging from 1 (strongly disagree) to 4 (strongly agree). The total score ranges from 10 to 40, with higher scores indicating more positive reinforcement. The internal consistency (Cronbach's alpha) of the Spanish version is .86.

The occurrence of automatic negative thoughts will be assessed through the Automatic Thoughts Questionnaire (ATQ; Hollon \& Kendall, 1980; Spanish version by Otero et al., 2017). This is a 30-item self-report questionnaire that assesses negative thoughts. The subject must indicate the frequency for which a number of thoughts have suddenly arisen in their mind over the last week on a five-point scale from 1 (never) to 5 (always). Scores range between 30 and 150, with a higher score indicating more negative thoughts experienced by the subject. The ATQ's internal consistency (Cronbach's alpha) is .96.

Self-reported memory will be measured with the Multifactorial Memory Questionnaire (MMQ; Troyer \& Rich, 2002). This 57-item self-administered test assesses subjective memory. Items are rated on a 5-point Likert scale based on the test taker's experiences over the previous two weeks. It comprises three dimensions: Contentment, Ability, and Strategy. Contentment measures satisfaction, concern, and overall appraisal of one's own memory; the score ranges from 0 to 72, with higher scores indicating greater satisfaction. The internal consistency is .95. Ability measures self-perception of everyday memory ability; the score range is 0 to 80, with higher scores indicating better self-reported memory ability, with an internal consistency of .93. Strategy measures the use of practical memory strategies in day-to-day life; the score range is 0 to 76, with higher scores indicating greater use of memory strategies. The internal consistency is .83.

Participants' sleep hygiene behaviors will be assessed with the Sleep Hygiene Index (SHI; Mastin et al., 2006). It is a 13-item self-report measure designed to assess the practice of sleep hygiene behaviors. Each item is rated on a five-point scale ranging from 0 (never) to 4 (always). The total score ranges from 0 to 52, with a higher score representing poorer sleep hygiene. Its internal consistency (Cronbach's alpha) is .66.

Participants' physical activity will be assessed with the Brief Physical Activity Assessment Tool (BPAAT; Marshall et al., 2005; Spanish version by Puig et al., 2012). This two-item questionnaire measures the frequency and duration of moderate and vigorous physical activity in an individual's usual week. Combining the results of both questions, scores can range from 0 to 8, with a higher score indicating higher physical activity. In addition, the subject can be classified as sufficiently (≥4 score) or insufficiently active (0-3 score). The questionnaire has good test-retest reliability and content validity.

Eating habits will be assessed with the Rapid Eating and Activity Assessment for Participants-Shortened Version (REAP-S; Segal-Isaacson et al., 2004 ). This 16-item scale assesses the consumption of different food groups. The total score ranges from 13 to 39, with a higher score representing better eating habits. This instrument has shown good convergent validity with the Block Semi Quantitative Food Frequency Questionnaire (Block, 1998), and is based on the Dietary Guidelines of the U.S. Department of Health and Human Services (Office of Disease Prevention and Health Promotion, 2015 ) and the Healthy People 2010 objectives (U.S.Department of Health and Human Services, 2000 ).

The Body Mass Index (BMI) is a measure of nutritional status in adults. It is defined as an individual's weight in kilograms divided by the square of the height in meters (kg/m2) and classifies nutritional status as underweight, normal weight, pre-obesity, and obesity (I, II, and III).

Social support will be assessed with the Duke-UNC Functional Social Support Questionnaire (Duke-UNC-11; Broadhead et al., 1988 ; Spanish version by Bellón et al., 1996). This self-report 11-item test assesses perceived social support. Each item is rated on a 5-point scale ranging from 1 (never) to 5 (always). The total score ranges from 11 to 55, with a higher score representing more social support. Its internal consistency (Cronbach's alpha) is .90.

Dropouts will be assessed by means of a register throughout the study. Treatment adherence will be automatically registered using both the online video game and the App by means of the number of modules completed by each participant, the time played, the time spent on cognitive tasks throughout the game and between session homework accomplishment.

Participant satisfaction with the service received will be evaluated upon intervention completion. We will use the Client Satisfaction Questionnaire (CSQ-8; Larsen et al., 1979; Spanish version by Vázquez et al., 2017). It is a 8-item scale with 4 possible answers and a final ranking score ranging from 8 to 32, where a higher score implies greater satisfaction with the service received. It has an internal consistency of .80.