The Effect of Timing and Frequency of Push Notifications on Usage of a Smartphone-Based Stress Management Intervention: An Exploratory Trial
Open accessAbstract
Push notifications offer a promising strategy for enhancing engagement with smartphone-based health interventions. Intelligent sensor-driven machine learning models may improve the timeliness of notifications by adapting delivery to a user's current context (e.g. location). This exploratory mixed-methods study examined the potential impact of timing and frequency on notification response and usage of Healthy Mind, a smartphone-based stress management intervention. 77 participants were randomised to use one of three versions of Healthy Mind that provided: intelligent notifications; daily notifications within pre-defined time frames; or occasional notifications within pre-defined time frames. Notification response and Healthy Mind usage were automatically recorded. Telephone interviews explored participants' experiences of using Healthy Mind. Participants in the intelligent and daily conditions viewed (d = .47, .44 respectively) and actioned (d = .50, .43 respectively) more notifications compared to the occasional group. Notification group had no meaningful effects on percentage of notifications viewed or usage of Healthy Mind. No meaningful differences were indicated between the intelligent and non-intelligent groups. Our findings suggest that frequent notifications may encourage greater exposure to intervention content without deterring engagement, but adaptive tailoring of notification timing does not always enhance their use. Hypotheses generated from this study require testing in future work. TRIAL REGISTRATION NUMBER: ISRCTN67177737.
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Studies that ranked high for selective reporting bias tended to report only user satisfaction data and treatment adherence, despite their methods considering collection and assessment of psychiatric scale data and other effectiveness outcomes.
“The studies that ranked high for selective reporting bias tended to report only user satisfaction data and treatment adherence, despite their methods considering the collection and assessment of psychiatric scale data and other effectiveness outcomes (29, 76, 79, 85–88, 92).”
From Examining the role of AI technology in online mental healthcare: opportunities, challenges, and implications, a mixed-methods review (2024) · cites this paper as [79]
Split into 2 atoms — 0 confirmed, 0 partially supported, 1 disputed, 0 misattributed, 1 unverifiable. Expand the claim to see per-atom verdicts.
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredIn terms of allegiance bias, most included articles developed and studied their own AI tools instead of AI tools developed by other researchers.
“In terms of allegiance bias, because of the scarcity and novelty of AI-augmented interventions and other AI algorithms, most of the included articles developed and studied their own AI tools, instead of AI tools developed by other researchers (29, 33, 73, 74, 76, 79, 80, 82–87, 90).”
From Examining the role of AI technology in online mental healthcare: opportunities, challenges, and implications, a mixed-methods review (2024) · cites this paper as [79]
The Method (Design and Intervention; page unavailable) describes a trial of Healthy Mind’s intelligent notification algorithm and says the app was created using Life Guide Toolbox software. It does not establish that this study’s authors developed the AI algorithm themselves; the Design section says its sensing and model-generation functions used independent open-source libraries. This paper also cannot establish the claim that most of the citing review’s included articles studied their own tools. (LLM, conf=0.80)
Experimental — accuracy not yet measuredMorrison et al. (2017) found that compared to occasional notifications, intelligent notifications and daily notifications encouraged a higher exposure to therapeutic content while maintaining engagement levels; however, timing of notification did not seem to support treatment engagement when comparing intelligent notifications against daily notifications.
“They found that compared to occasional notifications, intelligent notifications and daily notifications encouraged a higher exposure to the therapeutic content while maintaining engagement levels. However, they noted that the timing of the notification did not seem to support treatment engagement, when comparing intelligent notifications against daily notifications (79).”
From Examining the role of AI technology in online mental healthcare: opportunities, challenges, and implications, a mixed-methods review (2024) · cites this paper as [79]
The included studies (n=4) reported on implementation of intelligent notifications, momentary sensing, monitoring of treatment outcomes, and triage decision support.
“In terms of improvement to the delivery of online therapy, the included studies [n=4 (30, 75, 79, 80)] have reported on the implementation of intelligent notifications, momentary sensing, monitoring of treatment outcomes, and triage decision support.”
From Examining the role of AI technology in online mental healthcare: opportunities, challenges, and implications, a mixed-methods review (2024) · cites this paper as [79]
Morrison et al. (2017) found that there was no significant improvement comparing daily to intelligent notifications.
“Though, in the case of Morrison et al. (2017) they found that there was no significant improvement comparing daily to intelligent notifications (79, 80).”
From Examining the role of AI technology in online mental healthcare: opportunities, challenges, and implications, a mixed-methods review (2024) · cites this paper as [79]
Burns et al. (2011) and Morrison et al. (2017) implemented an AI algorithm that could learn from the user and their environment, to deliver intelligent treatment reminders.
“In terms of treatment engagement support, Burns et al. (2011) and Morrison et al. (2017) implemented an AI algorithm that could learn from the user and their environment, to deliver intelligent treatment reminders (79, 80).”
From Examining the role of AI technology in online mental healthcare: opportunities, challenges, and implications, a mixed-methods review (2024) · cites this paper as [79]
12 of the included studies presented data on treatment dropout; online or remote psychotherapy interventions reported a dropout rate between 0% and 61%, psychoeducation between 4% and 60%, and no intervention between 5% and 34%.
“12 of the included studies (41, 73–83) presented data on treatment dropout, online or remote psychotherapy interventions reported a dropout rate between 0% and 61%, psychoeducation a dropout rate between 4% and 60% and no intervention a dropout rate between 5% and 34%.”
From Examining the role of AI technology in online mental healthcare: opportunities, challenges, and implications, a mixed-methods review (2024) · cites this paper as [79]
The Results (Sample characteristics and Notification response and intervention usage; page unavailable) describe one Healthy Mind notification trial, including participants who ceased app use. Searches for treatment dropout, psychotherapy, psychoeducation, and the stated rate ranges found no passage reporting dropout across 12 studies or the three intervention categories. (LLM, conf=0.77)
Experimental — accuracy not yet measuredThere were a large variety of study types among the 17 studies, including pilot randomised controlled trials, observational studies, model evaluations, and a qualitative study.
“There were a large variety of study types among the 17 studies, including pilot randomised controlled trials (RCTs) [28–30], observational studies [31–35], model evaluations [36,37], and a qualitative study [38].”
From Artificial intelligence and machine learning in mobile apps for mental health: A scoping review (2022) · cites this paper as [28]
In some studies, AI/ML was used to personalise aspects of the app such as notification delivery.
“or to personalise aspects of the app such as notification delivery [28]”
From Artificial intelligence and machine learning in mobile apps for mental health: A scoping review (2022) · cites this paper as [28]
12 of the 17 included studies had sample sizes smaller than 100.
“12 of the 17 included studies had sample sizes smaller than 100 [28–31,33–35,37–39,41,42].”
From Artificial intelligence and machine learning in mobile apps for mental health: A scoping review (2022) · cites this paper as [28]
3 of the 17 studies focused on predicting or helping manage stress.
“predicting or helping manage stress [28,32,33]”
From Artificial intelligence and machine learning in mobile apps for mental health: A scoping review (2022) · cites this paper as [28]
One study using AI/ML to send context-specific notifications found no difference between the 'intelligent' notifications and non-intelligent notifications.
“One study using AI/ML to send context-specific notifications found no difference between the ‘intelligent’ notifications and non-intelligent notifications [28].”
From Artificial intelligence and machine learning in mobile apps for mental health: A scoping review (2022) · cites this paper as [28]
Only three randomised controlled trials of an AI-enabled mental health app were identified in this review.
“Only three randomised controlled trials of an AI-enabled mental health app were identified in this review [28–30]”
From Artificial intelligence and machine learning in mobile apps for mental health: A scoping review (2022) · cites this paper as [28]
All of the studies reviewed used data collected via mobile devices to inform AI models-for natural language analysis and output, risk stratification and prediction or for personalising the user's app experience.
“All of the studies reviewed used data collected via mobile devices to inform AI models—for natural language analysis and output [29,30,38,40,42,43], risk stratification and prediction [31,41] or for personalising the user’s app experience [28,44].”
From Artificial intelligence and machine learning in mobile apps for mental health: A scoping review (2022) · cites this paper as [28]
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- Authors
- Morrison, L. G., Hargood, C., Pejovic, V., Geraghty, A. W. A., Lloyd, S., Goodman, N., Michaelides, D. T., Weston, A., Musolesi, M., Weal, M. J., & Yardley, L.
- Affiliations
- University of Southampton (GB)
- Bournemouth University (GB)
- Durham University (GB)
- Gateshead Council (GB)
- University College London (GB)
- Corresponding author
- Morrison, Leanne G.
- ORCID
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2017-01-03
- Volume
- 12
- Issue
- 1
- Pages
- e0169162
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC5207732
- OpenAlex
- W1771486365
- Cited by
- 162
- References
- 41
- Citations by year
- 2026: 13 · 2025: 19 · 2024: 18 · 2023: 15 · 2022: 20 · 2021: 28 · 2020: 19 · 2019: 16 · 2018: 9 · 2017: 3 · 2014: 1
- FWCI
- 14.68
- Type
- journal article
- Language
- en
- Update notices
- correction (2018-05-22)
- Open access
- gold
- doi.org
- Licence
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Teesside University Research Portal (Teesside University) (publishedVersion, cc-by)
- Explore Bristol Research (publishedVersion, cc-by)
- Bournemouth University Research Online (Bournemouth University) (acceptedVersion)
- ePrints Soton (University of Southampton) (acceptedVersion)
- Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (submittedVersion, cc-by)
- TeesRep (Teesside University) (submittedVersion, cc-by)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Figshare (submittedVersion, cc-by)
- Bristol Research (University of Bristol) (submittedVersion, cc-by)
- Funders
- Engineering and Physical Sciences Research Council (EP/I032673/1)
- Topics
- Social Sciences › Psychology › Applied Psychology › Digital Mental Health Interventions
- Health Sciences › Health Professions › General Health Professions › Mobile Health and mHealth Applications
- Social Sciences › Psychology › Clinical Psychology › Mindfulness and Compassion Interventions
- Keywords
- push notifications, notification timing, smartphone-based intervention, stress management, healthy mind, user engagement, context-aware notifications, mobile health
- MeSH terms
- Smartphone, Machine Learning, Adolescent, Adult, Algorithms, Automation, Female, United Kingdom, Health Promotion, Humans, Male, Middle Aged, Public Health, Quality of Life, Stress, Psychological, Health Behavior, Telemedicine, Geographic Information Systems, Young Adult, Text Messaging, Accelerometry
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