ReviewEcological momentary assessment in aging research: A critical review
Introduction
Ecological momentary assessment (EMA) is defined by Shiffman et al. (2008) as “Monitoring or sampling strategies to assess phenomena at that moment they occur in natural settings, thus maximizing ecological validity while avoiding retrospective recall” (p. 3). Historically, EMA has represented an alternative to global self-report measures, encapsulating diaries, behavioral observation, self-monitoring, time-budget studies, experience sampling method, and ambulatory monitoring (Stone et al., 2007). EMA enables collection of data on the timing, frequency, or relative strength of symptoms, affect, behaviors, activities, and cognitive functions, with the general aim of assessing phenomena as close in time to their occurrence as possible, typically repeatedly over the course of a study (Moskowitz and Young, 2006). Given the dynamic interactions between affective, behavioral, and physical phenomena that are often the subjects of global self-reports used in aging research, as well as the influences of cognitive impairments on self-reports, EMA approaches may be useful for behavioral research in aging. However, while there are a number of excellent review articles on EMA approaches (Beal and Weiss, 2003, Bolger et al., 2003, Dubbert et al., 2002, Johnson and Bytheway, 2001, McConnell and Copestake, 1999, Moskowitz and Young, 2006, Shiffman et al., 2008), the use of these methods in aging research have not been recently reviewed. Our goal was to evaluate the feasibility and application of EMA in behavioral research in older samples so as to provide recommendations for future research.
EMA methods can be classified into three different categories: (1) diaries, (2) experience sampling, and (3) event-based sampling (Moskowitz and Young, 2006). These three approaches differ from each other in terms of design, use, and their proximity of timing with events or experiences of interest. Daily diaries are defined as “fixed-interval assessments with an assessment frequency of once per day, employing a retrospective coverage strategy” (Shiffman et al., 2008, p. 17). Experience sampling typically implements some form of signaling device, which randomly signals participants to make reports a fixed number of times per day (Moskowitz and Young, 2006). Another variation is event-based measurement, where self-reports are solicited at the time the variable of interest takes place (e.g., physical activity (Bolger et al., 2003).
Each of these approaches may provide a more comprehensive picture of a person’s activities and affect than global measures, revealing everyday events or feelings that may be viewed as trivial and thus easily forgotten (Milligan et al., 2005). Particularly when respondents are asked to describe emotional experiences, global questionnaires often exhibit recall biases in regard to past events. For example, respondents recall events as more negative with increasing time elapsed (Schaie, 2006). As well, recall may be influenced by the respondent’s mood at the time of assessment. Experimental research indicates that subjective experiences and their intensity are poorly retained in memory, and are often based on inference strategies or peak moments (Schwarz, 2007). Measures of performance in controlled laboratory settings can limit these recall biases, yet often lack ecological validity (Moskowitz and Young, 2006). However, the participant burden in EMA studies is usually greater than with more global types of assessment, as many of the EMA methods involve a significant time commitment over days, weeks, or months (Moskowitz and Young, 2006). Although these methods should limit retrospective recall biases that might be increased by memory deficits, prospective memory is required to remain compliant with data entry, and, thus compliance may be a concern among older adults.
We identified only one review of EMA methods in older adults, which was published in 1990 (Ujimoto, 1990). We conducted a critical review evaluating the feasibility and application of EMA methods in behavioral research in older populations, published between 1990 and 2007. Specifically, we synthesized research findings from four main arenas: (1) Sampling and administration feasibility: we collected data on the sample characteristics, timing, and duration of data collection; (2) Design: we assessed the frequency of differing study approaches (e.g., event-based) and data input methods (e.g., electronic versus paper); (3) Compliance: we examined the drop out rate and amount of missing data; and (4) Application: we assessed what kinds of research questions were addressed and the content of the instruments used.
Section snippets
Article selection and search strategy
We restricted our searches to studies published in English-language peer-reviewed journals between 1990 and 2007, whose samples were limited to adults over age 50. We excluded studies that included any participants younger than age 50 as well as those that solely gathered data on dietary habits, physical symptoms, or sleep. The decision to include papers with participants older than age 50 (rather than a more typical older adult age cut-off such as age 60 Hazzard, 2003) was based on the
Studies selected
After removing duplicate references found in both databases, a total of 520 unique studies were identified through keyword searches on Psycinfo and Pubmed. After reviewing abstracts and subsequently full-text articles and their reference sections, 40 articles were selected for this review (See Fig. 1 for a detailed flowchart describing the outcomes of the selection process).
Sample characteristics
The mean number of participants was 237.1 (sd = 649.3, range = 10–3950; median = 77.5) (Table 1). The mean sample size is skewed
Discussion
Our systematic literature review identified a total of 40 studies using EMA methods in older adults since 1990. There was a wide variety of uses for these methods, and a considerable range in methods of implementation, although. Use of these methods among older samples with psychiatric disabilities was limited to six studies. Most studies employed fixed-schedule reporting, which was related to the low use of electronic methods of data collection. Compliance with these methods was inconsistently
Role of the funding sources
This work was supported, in part, by the National Institute of Mental Health grants K23MH077225 and P30MH066248, by the Sam and Rose Stein Institute for Research on Aging, and by the Department of Veterans Affairs. These funding sources had no further role in study design; in the collection, analysis and interpretation of data; in the writing of the report; and in the decision to submit the paper for publication.
Conflict of interest statement
None of the authors have any disclosures of interest to report.
Contributors
Ashley Cain conducted the literature review, was involved in the design and writing of this manuscript. Colin Depp was involved in the design and writing of this manuscript. Dilip Jeste assisted in the design, interpretation of the results, and preparation. All authors contributed to and have approved the final manuscript.
Acknowledgements
This work was supported, in part, by National Institute of Mental Health Grants K23MH077225 and P30MH066248, by the Sam and Rose Stein Institute for Research on Aging and by the Department of Veterans Affairs.
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