Focus Watch, from Cortexonquant Labs
Every claim we make about attention, focus and phones, with the study behind it, how strong the evidence is, and exactly what we say because of it. When a study is weak or found no effect, we say so. Updated 2026-10-09, 37 sources.
Strong many studies agree
What the study found: Setting external reminders is highly effective for carrying out delayed intentions.
Gilbert et al. 2022, Psychonomic Bulletin and Review, review of intention offloading. Read the source. Checked 2026-10-07 in Consensus.
Strong many studies agree
What the study found: If-then plans had a medium to large effect on goal attainment, including starting and shielding goals.
Gollwitzer and Sheeran 2006, Adv Exp Soc Psychol 38, meta-analysis of 94 tests. Read the source. Checked 2026-10-07 in Consensus.
Strong many studies agree
What the study found: Responses are slower and usually more error-prone just after a task switch. Preparation reduces but does not remove the cost.
Monsell 2003, Trends Cogn Sci 7(3) 134-140, Task switching. Read the source. Checked 2026-10-07 in PubMed.
Strong many studies agree
What the study found: Dopamine neurons signal errors in the prediction of reward (animal work and theory).
Schultz, Dayan and Montague 1997, Science 275 1593-1599. Read the source. Checked 2026-10-07 in PubMed.
Strong many studies agree
What the study found: If-then plans helped across outcomes. Stronger when the plan is truly if-then, the goal matters, and the plan is rehearsed.
Sheeran et al. 2024, Eur Rev Soc Psychol, meta-analysis of 642 tests. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: Micro-breaks gave small boosts to vigour and small drops in fatigue. The effect on overall performance was not significant.
Albulescu et al. 2022, PLoS ONE, meta-analysis of 22 samples. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: Nature beat non-nature on average. Benefits small and heterogeneous, larger after fatigue and longer exposures.
Bell et al. 2025, J Environ Psychol, meta-analysis of 80 studies. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: A nature walk, and pictures of nature, improved a directed attention task against urban scenes.
Berman, Jonides and Kaplan 2008, Psychol Sci 19(12) 1207-1212. Read the source. Checked 2026-10-06 in PubMed.
Moderate good studies, not yet settled
What the study found: Social media style notifications caused a brief slowdown on a Stroop task, larger for people who check often.
Fournier et al. 2026, Comput Hum Behav, Attention hijacked. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: Offloading can cause forgetting of the offloaded items but improves memory for other items (saving-enhanced memory). A model that reproduces many findings.
Gilbert 2024, Cognition, value-based model of cognitive offloading. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: People think about what is not happening almost as often as about what is (and doing so typically made them less happy).
Killingsworth and Gilbert 2010, Science 330(6006) 932, experience sampling by smartphone. Read the source. Checked 2026-10-07 in PubMed.
Moderate good studies, not yet settled
What the study found: After switching away from an unfinished task, attention stays partly on it (attention residue) and performance on the next task suffers.
Leroy 2009, Organ Behav Hum Decis Process 109(2) 168-181, attention residue. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: Briefly planning the return to an interrupted task (a ready-to-resume plan) reduced attention residue and protected performance on the next task.
Leroy and Glomb 2018, Organization Science 29(3) 380-397, ready-to-resume plan, four studies. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: Hiding notifications changed how students checked (fewer checks, longer sessions) but did not improve learning. Both patterns raised mental effort.
Liao et al. 2026, Instructional Science, quasi-experiment, 84 undergraduates. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: Switching off social media notifications reduced app use during the treatment period, but the effect was not sustained after it ended. People high in urgency kept using more despite deactivation.
Liu et al. 2026, Information & Management, 21-day field experiment on notification deactivation. Read the source. Checked 2026-10-08 in Consensus.
Moderate good studies, not yet settled
What the study found: Median duration of online screen focus was 40 seconds. Shorter focus was linked to neuroticism and to lower how productive they felt at day's end. It measures time on one screen before switching, not attention span.
Mark, Iqbal, Czerwinski, Johns and Sano 2016, CHI Conference on Human Factors in Computing Systems, in situ logging of 40 information workers over two work weeks. Read the source. Checked 2026-10-09 in Consensus.
Moderate good studies, not yet settled
What the study found: Two daily classroom active breaks over four months raised d2-R concentration scores against usual routine.
Martone et al. 2026, Sports (Basel) 14(9), cluster-randomised trial, 529 adolescents in 39 classes. Read the source. Checked 2026-10-08 in PubMed.
Moderate good studies, not yet settled
What the study found: The salience network detects salient events and switches attention toward them.
Menon and Uddin 2010, Brain Struct Funct 214 655-667. Read the source. Checked 2026-10-06 in PubMed.
Moderate good studies, not yet settled
What the study found: Engagement in one task left attention residue that lowered engagement and performance in the next. Finishing the task reduced it.
Newton et al. 2020, Journal of Applied Psychology, NASA analog crews and a lab study. Read the source. Checked 2026-10-07 in Consensus.
Moderate good studies, not yet settled
What the study found: When people expected a reminder, brain activity for the item resembled a forget cue and its neural pattern faded. The authors read this as adaptive prioritising of limited capacity.
Scarampi, Sachdeva, Tsai and Gilbert 2026, Scientific Reports, fMRI of cognitive offloading (Grok trend lead, 7 Oct 2026). Read the source. Checked 2026-10-07 in publisher page (nature.com) and Consensus.
Moderate good studies, not yet settled
What the study found: The mind is only now and then aware that it has wandered (meta-awareness comes and goes).
Schooler et al. 2011, Trends Cogn Sci 15(7) 319-326. Read the source. Checked 2026-10-07 in PubMed.
Moderate good studies, not yet settled
What the study found: Systematic review, effects of nature on attention low to moderate.
Stevenson, Schilhab and Bentsen 2018, J Toxicol Environ Health B 21(4) 227-268. Read the source. Checked 2026-10-06 in PubMed.
Moderate good studies, not yet settled
What the study found: Notifications alone, unanswered, disrupted performance on an attention task.
Stothart, Mitchum and Yehnert 2015, J Exp Psychol Hum Percept Perform 41(4) 893-897. Read the source. Checked 2026-10-06 in PubMed.
Moderate good studies, not yet settled
What the study found: Short smartphone breaks versus quiet breaks made no difference to later task performance or mind wandering. Phone breaks lifted mood more.
Yildirim et al. 2026, Psychological Reports, within-subjects lab study. Read the source. Checked 2026-10-07 in Consensus.
Mixed studies disagree
What the study found: Turning notifications off for a week did not change checking, distraction or how much got done.
Dekker et al. 2024, Media Psychology, randomised trial (205 people), a week with smartphone notifications off. Read the source. Checked 2026-10-07 in Consensus.
Mixed studies disagree
What the study found: Brief nature images felt more restorative but did not change sustained attention performance.
Johnson et al. 2022, Front Psychol, two experiments. Read the source. Checked 2026-10-07 in Consensus.
Mixed studies disagree
What the study found: A brief view of a green roof improved sustained attention against a concrete roof.
Lee et al. 2015, J Environ Psychol, 40-second green roof views. Read the source. Checked 2026-10-07 in Consensus.
Mixed studies disagree
What the study found: Reducing social media or smartphone time showed more benefit to well-being than total abstinence. Effects vary and evidence is limited.
Marciano et al. 2024, Pediatrics, state-of-the-art review. Read the source. Checked 2026-10-07 in Consensus.
Mixed studies disagree
What the study found: One workday without notifications improved performance and lowered strain.
Ohly et al. 2023, Journal of Occupational Health, field experiment (247 people), one day without notifications. Read the source. Checked 2026-10-07 in Consensus.
Mixed studies disagree
What the study found: Youths used phones in every hour of the school day. More frequent checking was associated with poorer inhibitory control.
Telzer et al. 2026, JAMA Network Open, cross-sectional, 79 youths aged 11 to 18. Read the source. Checked 2026-10-07 in Consensus.
No effect found tested, and the effect was not there
What the study found: The mere presence of a smartphone had no significant effect on cognitive outcomes (33 studies).
Hartanto et al. 2024, Technology, Mind, and Behavior, four-level meta-analysis. Read the source. Checked 2026-10-07 in Consensus.
No effect found tested, and the effect was not there
What the study found: A brief mindfulness induction raised state mindfulness but did not improve executive functions or reduce mind wandering immediately afterwards.
Shi et al. 2026, BMC Psychology, randomised brief mindfulness induction against an audiobook control. Read the source. Checked 2026-10-08 in Consensus.
Weak one study, or a link not a cause
What the study found: Within-person rises in problematic phone use predicted later rises in procrastination in only one of three intervals. The reverse was not detected. A stable trait-level link remained. Self-report only, and the cross-lagged estimates did not hold with a common-method factor.
Che 2026, Frontiers in Psychology, four-wave random intercept cross-lagged panel, 512 undergraduates over one academic year. Read the source. Checked 2026-10-09 in publisher page (frontiersin.org), Grok watch lead 8 Oct 2026.
Weak one study, or a link not a cause
What the study found: Students who rated phone interruptions as more salient reported more attentional residue and lower study effectiveness. Higher self-control weakened the link. All self-report at one time, no causal claim.
Chen 2026, Acta Psychologica 270, 107925, cross-sectional survey, 426 university students in four Chinese cities. Read the source. Checked 2026-10-09 in PubMed, Grok watch lead 8 Oct 2026.
Weak one study, or a link not a cause
What the study found: Total screen time did not predict Stroop accuracy. Fragmented use (frequent pickups, short sessions) was associated with weaker proactive conflict control.
Ince et al. 2026, BMC Neuroscience, cross-sectional digital phenotyping study, 206 university students. Read the source. Checked 2026-10-08 in Consensus.
Weak one study, or a link not a cause
What the study found: Classroom digital distraction predicted lower later academic engagement, and engagement predicted less later distraction (small effects, self-report).
Li and Chen 2026, Frontiers in Psychology, three-wave cross-lagged panel, 1,020 high school students. Read the source. Checked 2026-10-08 in PubMed.
Weak one study, or a link not a cause
What the study found: Writing ready-to-resume plans at work reduced attention residue and weakened its link with exhaustion (small field sample).
van Zoonen et al. 2025, Int J Stress Manag, daily diary field experiment. Read the source. Checked 2026-10-07 in Consensus.
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