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  1. Article ; Online: Investigating the role of contextual cues and interhemispheric inhibitory mechanisms in response-selective stopping: a TMS study.

    Puri, Rohan / St George, Rebecca J / Hinder, Mark R

    Cognitive, affective & behavioral neuroscience

    2022  Volume 23, Issue 1, Page(s) 84–99

    Abstract: Response-selective stopping requires cancellation of only one component of a multicomponent action. While research has investigated how delays to the continuing action components ("stopping interference") can be attenuated by way of contextual cues of ... ...

    Abstract Response-selective stopping requires cancellation of only one component of a multicomponent action. While research has investigated how delays to the continuing action components ("stopping interference") can be attenuated by way of contextual cues of the specific stopping demands ("foreknowledge"), little is known of the underlying neural mechanisms. Twenty-seven, healthy, young adults undertook a multicomponent stop-signal task. For two thirds of trials, participants responded to an imperative (go) stimulus (IS) with simultaneous button presses using their left and right index fingers. For the remaining one third of trials, the IS was followed by a stop-signal requiring cancellation of only the left, or right, response. To manipulate foreknowledge of stopping demands, a cue preceded the IS that informed participants which hand might be required to stop (proactive) or provided no such information (reactive). Transcranial magnetic stimulation (TMS) assessed corticospinal excitability (CSE) as well as short- and long-interval interhemispheric inhibition (SIHI, LIHI) between the primary motor cortices. Proactive cues reduced, but did not eliminate, stopping interference relative to the reactive condition. Relative to TMS measures at cue onset, decreases in CSE (both hands and both cue conditions) and LIHI (both hands, proactive condition only) were observed during movement preparation. During movement cancellation, LIHI reduction in the continuing hand was greater than that in the stopping hand and greater than LIHI reductions in both hands during execution of multicomponent responses. Our results indicate that foreknowledge attenuates stopping interference and provide evidence for a novel role of LIHI, mediated via prefrontal regions, in facilitating continuing action components.
    MeSH term(s) Young Adult ; Humans ; Cues ; Transcranial Magnetic Stimulation/methods ; Motor Cortex/physiology ; Evoked Potentials, Motor/physiology ; Hand ; Reaction Time/physiology
    Language English
    Publishing date 2022-11-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2029088-3
    ISSN 1531-135X ; 1530-7026
    ISSN (online) 1531-135X
    ISSN 1530-7026
    DOI 10.3758/s13415-022-01047-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Impaired motor inhibition during perceptual inhibition in older, but not younger adults: a psychophysiological study.

    Healey, Rebecca / Goldsworthy, Megan / Salomoni, Sauro / Weber, Simon / Kemp, Sarah / Hinder, Mark R / St George, Rebecca J

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 2023

    Abstract: The prefrontal cortex (PFC) governs the ability to rapidly cancel planned movements when no longer appropriate (motor inhibition) and ignore distracting stimuli (perceptual inhibition). It is unclear to what extent these processes interact, and how they ... ...

    Abstract The prefrontal cortex (PFC) governs the ability to rapidly cancel planned movements when no longer appropriate (motor inhibition) and ignore distracting stimuli (perceptual inhibition). It is unclear to what extent these processes interact, and how they are impacted by age. The interplay between perceptual and motor inhibition was investigated using a Flanker Task, a Stop Signal Task and a combined Stop Signal Flanker Task in healthy young (n = 33, Mean = 24 years) and older adults (n = 32, Mean = 71 years). PFC activity was measured with functional near-infrared spectroscopy (fNIRS), while electromyography (EMG) measured muscle activity in the fingers used to respond to the visual cues. Perceptual inhibition (the degree to which incongruent flankers slowed response time to a central cue) and motor inhibition (the speed of cancellation of EMG activation following stop cues) independently declined with age. When both processes were engaged together, PFC activity increased for both age groups, however only older adults exhibited slower motor inhibition. The results indicate that cortical upregulation was sufficient to compensate for the increased task demands in younger but not older adults, suggesting potential resource sharing and neural limitations particularly in older adults.
    MeSH term(s) Cues ; Electromyography ; Fingers ; Psychophysiology ; Reaction Time ; Humans ; Young Adult
    Language English
    Publishing date 2024-01-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-52269-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: A retrospective analysis of emergency referrals and admissions to a regional neurosurgical centre 2016-2018.

    Spencer, R J / Amer, S / St George, E J

    British journal of neurosurgery

    2020  Volume 35, Issue 4, Page(s) 438–443

    Abstract: Background and objectives: Emergencies account for 60% of UK neurosurgical workload. We analysed the emergency referrals made to the on-call neurosurgical registrar in a regional centre over three years, aiming to identify temporal trends in volume of ... ...

    Abstract Background and objectives: Emergencies account for 60% of UK neurosurgical workload. We analysed the emergency referrals made to the on-call neurosurgical registrar in a regional centre over three years, aiming to identify temporal trends in volume of referrals, admission practices and major diagnostic categories contributing to referrals and admissions.
    Methods: Individual referrals recorded in on-call databases were processed to extract basic demographics, call timing, diagnosis category and whether the patient was admitted under neurosurgery. Linear regression analysis was used to identify temporal trends across the three years.
    Results: A total of 18128 calls were made to the on-call registrar between 2016 and 2018, with a significant increase in monthly calls. On average, one call was received every 88 minutes. An increasing proportion of these calls were taken out of office hours. Diagnostic categories accounting for the largest percentage of calls were traumatic brain injury (17.7%) and cauda equina syndrome (13%). Significant increases in referral volume were seen in cauda equina syndrome, traumatic brain injury, spinal trauma and spinal tumours, while no category had a significant decrease. The admission rate was 17.1% - no change was seen in this across the study period, resulting in increasing numbers of admissions, reflecting increasing referrals. Categories most likely to result in admission were hydrocephalus (41.1%), spontaneous subarachnoid haemorrhage (39.4%), intracranial infection (32.6%) and chronic subdural haematoma (CSDH, 32.2%). A change in admission rate was seen only for CSDH, with a significant increase in the percentage of referrals across the study period.
    Conclusion: Emergency neurosurgical referrals continue to rise in the UK at a rate exceeding population growth. This implies a decreasing referral threshold. However, the constant admission rate suggests either an increasing amount of neurosurgical pathology, the threshold for admission/intervention has decreased, or a combination. Neurosurgical services need to adapt in order to meet increasing demands.
    MeSH term(s) Hospitalization ; Humans ; Neurosurgery ; Neurosurgical Procedures ; Referral and Consultation ; Retrospective Studies
    Language English
    Publishing date 2020-12-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 639029-8
    ISSN 1360-046X ; 0268-8697
    ISSN (online) 1360-046X
    ISSN 0268-8697
    DOI 10.1080/02688697.2020.1853675
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  4. Article: Providing clinicians with 'how to' knowledge for technology-based innovation: Introducing the SMS4dads texts.

    Fletcher, Richard / Regan, Casey / StGeorge, Jennifer

    Health promotion journal of Australia : official journal of Australian Association of Health Promotion Professionals

    2023  Volume 35, Issue 2, Page(s) 481–486

    Abstract: Issue addressed: Male partners are key supports for women in birth preparation and postnatally. Text-messaging can deliver timely information to expectant and new fathers to increase their support of the mother. However, technological innovations in ... ...

    Abstract Issue addressed: Male partners are key supports for women in birth preparation and postnatally. Text-messaging can deliver timely information to expectant and new fathers to increase their support of the mother. However, technological innovations in healthcare often fail to be adopted. This study aims to assess the impact of disseminating a 'taster' set of SMS messages to increase clinicians' engagement with the intervention.
    Methods: Example messages from SMS4dads were delivered to clinicians over a 3-week period and a link provided to an evaluation survey. Agreement to two closed questions was rated on a five-point Likert scale; the frequency of specific recalled messages was calculated for the first open-ended question. Responses to the remaining open-ended questions were analysed with a descriptive thematic approach.
    Results: A total of 418 participants (female 61.5%) working in health organisations (80.4%), mostly in nursing (33.9%) or midwifery (19.6%) enrolled. Of the 77 (18.4%) participants who provided an evaluation, 96% agreed or strongly agreed that the Professional Taster gave them a better understanding of how to explain the program, and 88% agreed or strongly agreed that they are now more likely to tell parents about the program. Analysis of the remaining two open-ended questions revealed clinicians' concerns for fathers alongside their primary focus on maternal wellbeing.
    Conclusion: Providing 'how to' knowledge through receiving a sample of the intervention may increase clinicians' acceptance of technological innovation. SO WHAT?: Health-promoting digital interventions using text are increasing. Novel tested strategies for gaining buy-in from healthcare staff will be needed.
    MeSH term(s) Humans ; Male ; Female ; Parents ; Surveys and Questionnaires ; Text Messaging ; Mothers ; Technology
    Language English
    Publishing date 2023-07-12
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2250864-8
    ISSN 2201-1617 ; 1036-1073
    ISSN (online) 2201-1617
    ISSN 1036-1073
    DOI 10.1002/hpja.778
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  5. Article ; Online: Cognitive inhibition tasks interfere with dual-task walking and increase prefrontal cortical activity more than working memory tasks in young and older adults

    St George, Rebecca J / Jayakody, Oshadi / Healey, Rebecca / Breslin, Monique / Hinder, Mark R / Callisaya, Michele L

    Gait & posture

    2022  Volume 95, Page(s) 186–191

    Abstract: Background: Prior work suggests there may be greater reliance on executive function for walking in older people. The pre-frontal cortex (PFC), which controls aspects of executive function, is known to be active during dual-task walking (DTW). However, ... ...

    Abstract Background: Prior work suggests there may be greater reliance on executive function for walking in older people. The pre-frontal cortex (PFC), which controls aspects of executive function, is known to be active during dual-task walking (DTW). However, there is debate on how PFC activity during DTW is impacted by ageing and the requirements of the cognitive task.
    Research question: Functional near infrared spectroscopy, was used to investigate how PFC activity during walking was affected by (i) healthy ageing; and (ii) dual-tasks that utilise inhibition or working memory aspects of executive function.
    Methods: Young (n = 26, 16 females, mean 20.9 years) and older (n = 26, 16 females, mean 70.3 years) adults performed five conditions: normal walking; Reciting Alternate Letters of the alphabet (RAL, requiring cognitive inhibition and working memory) during standing and walking; and serial subtraction by threes (SS3, requiring working memory alone) during standing and walking. Walking speed, cognitive performance, the PFC haemodynamic response, and fear of falling ratings were analysed using linear mixed-effects modelling.
    Results: Compared to quiet standing, PFC activity increased during normal walking for older adults but decreased for young adults (p < 0.01). Across both groups, fear of falling contributed to higher PFC activity levels when walking (p < 0.01). PFC activity increased during DTW, and this increase was greater when performing RAL compared to the SS3 task (p < 0.01). Although the rate of correct responses was higher for RAL, walking speed reduced more with RAL than SS3 in the young group (p = 0.01), and the rate of correct responses reduced more when walking with RAL than SS3 in the older group (p < 0.01).
    Significance: Older adults have increased levels of PFC activation during walking compared to younger adults and fear of falling is a cofounding factor. The interference between gait and a concurrent cognitive task is higher when the cognitive task requires inhibition.
    MeSH term(s) Accidental Falls ; Aged ; Cognition/physiology ; Fear ; Female ; Gait/physiology ; Humans ; Memory, Short-Term ; Spectroscopy, Near-Infrared ; Walking/physiology ; Young Adult
    Language English
    Publishing date 2022-04-26
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1162323-8
    ISSN 1879-2219 ; 0966-6362
    ISSN (online) 1879-2219
    ISSN 0966-6362
    DOI 10.1016/j.gaitpost.2022.04.021
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  6. Article ; Online: Evaluation of measles IgM antibody detection assays during the 2018-2019 outbreak in New York State.

    Carson, Kyle J / Tucker, Heidi R / Howard, Kelly / Hales, Margaux / Bryant, Patrick W / St George, Kirsten / Kulas, Karen E / Lee, William T

    Diagnostic microbiology and infectious disease

    2022  Volume 104, Issue 1, Page(s) 115741

    Abstract: Although measles was eliminated in the United States in 2000, a severe outbreak occurred between October 2018 and September 2019. New York was especially hard hit. Serology played an integral role in determining immune status (IgG) and identifying, along ...

    Abstract Although measles was eliminated in the United States in 2000, a severe outbreak occurred between October 2018 and September 2019. New York was especially hard hit. Serology played an integral role in determining immune status (IgG) and identifying, along with molecular analyses, acute measles infections (IgM). Although an indirect immunofluorescence assay (IFA) was historically used by the New York State Department of Health for measles IgM detection, a higher throughput assay was needed to address the increased specimen numbers. Four commercial enzyme-linked immunosorbent assays (ELISAs) were evaluated for sensitivity and specificity in detecting measles IgM. Two ELISA formats were compared, indirect ELISA and IgM antibody capture. Both formats had comparable specificity as determined by cross-reactivity to non-measles specimens. Overall, the sensitivity of the capture ELISAs was greater than the indirect ELISAs and comparable to the indirect immunofluorescence assay with benefits regarding capacity, cost, and turnaround time.
    MeSH term(s) Antibodies, Viral ; Disease Outbreaks ; Enzyme-Linked Immunosorbent Assay ; Humans ; Immunoglobulin M ; Measles/diagnosis ; Measles/epidemiology ; New York/epidemiology ; Sensitivity and Specificity ; Serologic Tests
    Chemical Substances Antibodies, Viral ; Immunoglobulin M
    Language English
    Publishing date 2022-06-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604920-5
    ISSN 1879-0070 ; 0732-8893
    ISSN (online) 1879-0070
    ISSN 0732-8893
    DOI 10.1016/j.diagmicrobio.2022.115741
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  7. Article ; Online: Trends in Pediatric Anterior Cruciate Ligament Reconstruction in Australia: An Analysis of Australian Medicare Benefits Schedule Database From 2001 to 2020.

    Campbell, Ryan J / An, Vincent / Molnar, Robert / St George, Justine / Sivakumar, Brahman S / Symes, Michael

    Journal of pediatric orthopedics

    2024  Volume 44, Issue 5, Page(s) 347–352

    Abstract: Background: Anterior cruciate ligament (ACL) injuries are common and increasingly prevalent in the pediatric population. However, there remain sparse epidemiological data on the surgical treatment of these injuries. The objective of this study is to ... ...

    Abstract Background: Anterior cruciate ligament (ACL) injuries are common and increasingly prevalent in the pediatric population. However, there remain sparse epidemiological data on the surgical treatment of these injuries. The objective of this study is to assess the trends in the rate of pediatric ACL reconstruction in Australia over the past 2 decades.
    Methods: The incidence of ACL reconstruction from 2001 to 2020 in patients 5 to 14 years of age was analyzed using the Australian Medicare Benefits Schedule (MBS) database. Data were stratified by sex and year. An offset term was introduced using population data from the Australian Bureau of Statistics to account for population changes over the study period.
    Results: A total of 3719 reconstructions for the management of pediatric ACL injuries were performed in Australia under the MBS in the 20-year period from 2001 to 2020. There was a statistically significant annual increase in the total volume and per capita volume of pediatric ACL reconstructions performed across the study period ( P <0.0001). There was a significant increase in the rate of both male and female reconstructions ( P <0.0001), with a greater proportion of reconstructions performed on males (n=2073, 56%) than females (n=1646, 44%). In 2020, the rate of pediatric ACL reconstructions decreased to a level last seen in 2015, likely due to the effects of COVID-19.
    Conclusions: The incidence of ACL reconstruction in skeletally immature patients has increased in Australia over the 20-year study period. This increase is in keeping with evidence suggesting poor outcomes with nonoperative or delayed operative management.
    MeSH term(s) Aged ; Humans ; Child ; Male ; Female ; Australia/epidemiology ; National Health Programs ; Anterior Cruciate Ligament Injuries/epidemiology ; Anterior Cruciate Ligament Injuries/surgery ; Anterior Cruciate Ligament Reconstruction ; Databases, Factual
    Language English
    Publishing date 2024-02-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 604642-3
    ISSN 1539-2570 ; 0271-6798
    ISSN (online) 1539-2570
    ISSN 0271-6798
    DOI 10.1097/BPO.0000000000002646
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Functional Near-infrared Spectroscopy Reveals the Compensatory Potential of Pre-frontal Cortical Activity for Standing Balance in Young and Older Adults.

    St George, Rebecca J / Hinder, Mark R / Puri, Rohan / Walker, Eliza / Callisaya, Michele L

    Neuroscience

    2020  Volume 452, Page(s) 208–218

    Abstract: Recent evidence suggests increased activity of the pre-frontal cortex (PFC) is associated with sensorimotor disturbances of standing balance. Here we manipulate sensorimotor inputs and concurrently load cognitive resources in order to investigate the ... ...

    Abstract Recent evidence suggests increased activity of the pre-frontal cortex (PFC) is associated with sensorimotor disturbances of standing balance. Here we manipulate sensorimotor inputs and concurrently load cognitive resources in order to investigate the functional role of PFC activity during standing balance, and how this changes with healthy ageing. Healthy younger (n = 24; mean age = 20.8 years) and older (n = 25; mean age = 70.6 years) adults maintained balance while sensorimotor inputs were manipulated by removing vision, reducing the base of support, and reducing proprioceptive feedback. To load cognitive resources, each balance condition was undertaken alone or simultaneously with a cognitive task (dual-task). Functional near infrared spectroscopy (fNIRS) measured PFC activity and a force-plate measured postural sway. When comparing dual-tasks relative to single balance tasks (dual-task effect), at lower levels of balance task demand, the older adults exhibited increased PFC activity and similar levels of postural sway. However, at higher levels of balance task demand, a limit to PFC activity was observed and postural sway became more unstable in older adults. In contrast, for younger adults at higher levels of balance task demand, the dual-task effect resulted in an increase in PFC activity and postural sway was not unduly affected. These results suggest that PFC activity is compensating for sensorimotor deficits to maintain stability, and that a cognitive resource limit is reached for easier balance tasks in older people compared to younger people. These results suggest that increasing cortical capacity in older people may improve their balance.
    MeSH term(s) Adult ; Aged ; Aged, 80 and over ; Cognition ; Frontal Lobe ; Humans ; Postural Balance ; Spectroscopy, Near-Infrared ; Vision, Ocular ; Young Adult
    Language English
    Publishing date 2020-11-14
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 196739-3
    ISSN 1873-7544 ; 0306-4522
    ISSN (online) 1873-7544
    ISSN 0306-4522
    DOI 10.1016/j.neuroscience.2020.10.027
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  9. Article ; Online: The Impact of Gender on Long-Term Quality of Life After Sinus Surgery for Chronic Rhinosinusitis.

    Adams, Dara R / Xu, Lucy J / Vickery, Thad W / Scangas, George A / Bleier, Benjamin S / Gray, Stacey T / Metson, Ralph

    The Laryngoscope

    2023  Volume 133, Issue 12, Page(s) 3319–3326

    Abstract: Objective: To identify the impact of gender on the clinical outcomes of endoscopic sinus surgery (ESS) through the comparison of quality of life measures in female and male patients who undergo surgical treatment for chronic rhinosinusitis (CRS).: ... ...

    Abstract Objective: To identify the impact of gender on the clinical outcomes of endoscopic sinus surgery (ESS) through the comparison of quality of life measures in female and male patients who undergo surgical treatment for chronic rhinosinusitis (CRS).
    Study design: Prospective observational cohort study.
    Methods: Patients with CRS completed the 22-item Sino-Nasal Outcome Test (SNOT-22) and EuroQol 5-Dimension Survey (EQ-5D) preoperatively and annually for 5 years following ESS. Health utility values (HUV) were calculated from EQ-5D scores. Comparisons of cohort characteristics were performed with chi-square and t-tests. A multivariable linear mixed effects model evaluated changes in SNOT-22 and HUV over time by gender.
    Results: Among the 1268 patients (54% female) enrolled, 789 and 343 completed postoperative surveys at one and 5 years, respectively. Preoperatively, females experienced more severe symptoms: mean SNOT-22 score (51.1 ± 20.9 female vs. 44.7 ± 20.0 male, p < 0.001) and HUV (0.80 ± 0.14 female vs. 0.84 ± 0.11 male, p < 0.001). These gender differences were resolved by year one postoperatively (SNOT-22: p = 0.083; HUV: p = 0.465). Two years after surgery, however, females reported more severe symptoms (SNOT-22: 25.6 ± 20.7 female vs. 21.5 ± 17.4 male, p = 0.005; HUV: 0.88 ± 0.12 female vs. 0.90 ± 0.11 male, p = 0.018), a difference that persisted at year five. These gender-related differences remained after adjusting for age, race, ethnicity, nasal polyps, history of prior ESS, and smoking status (p < 0.001). Within-subject improvement was comparable between genders (SNOT-22: p = 0.869; HUV: p = 0.611).
    Conclusion: Females with CRS reported more severe symptoms both before and 5 years after surgery compared to their male counterparts. Understanding the mechanism behind these gender-related differences is important for optimizing CRS treatment.
    Level of evidence: 2 Laryngoscope, 133:3319-3326, 2023.
    MeSH term(s) Humans ; Male ; Female ; Quality of Life ; Prospective Studies ; Rhinitis/surgery ; Sinusitis/surgery ; Chronic Disease ; Endoscopy/methods ; Treatment Outcome
    Language English
    Publishing date 2023-04-28
    Publishing country United States
    Document type Observational Study ; Journal Article
    ZDB-ID 80180-x
    ISSN 1531-4995 ; 0023-852X
    ISSN (online) 1531-4995
    ISSN 0023-852X
    DOI 10.1002/lary.30719
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  10. Article ; Online: Development of a smartphone screening test for preclinical Alzheimer's disease and validation across the dementia continuum.

    Alty, Jane / Goldberg, Lynette R / Roccati, Eddy / Lawler, Katherine / Bai, Quan / Huang, Guan / Bindoff, Aidan D / Li, Renjie / Wang, Xinyi / St George, Rebecca J / Rudd, Kaylee / Bartlett, Larissa / Collins, Jessica M / Aiyede, Mimieveshiofuo / Fernando, Nadeeshani / Bhagwat, Anju / Giffard, Julia / Salmon, Katharine / McDonald, Scott /
    King, Anna E / Vickers, James C

    BMC neurology

    2024  Volume 24, Issue 1, Page(s) 127

    Abstract: Background: Dementia prevalence is predicted to triple to 152 million globally by 2050. Alzheimer's disease (AD) constitutes 70% of cases. There is an urgent need to identify individuals with preclinical AD, a 10-20-year period of progressive brain ... ...

    Abstract Background: Dementia prevalence is predicted to triple to 152 million globally by 2050. Alzheimer's disease (AD) constitutes 70% of cases. There is an urgent need to identify individuals with preclinical AD, a 10-20-year period of progressive brain pathology without noticeable cognitive symptoms, for targeted risk reduction. Current tests of AD pathology are either too invasive, specialised or expensive for population-level assessments. Cognitive tests are normal in preclinical AD. Emerging evidence demonstrates that movement analysis is sensitive to AD across the disease continuum, including preclinical AD. Our new smartphone test, TapTalk, combines analysis of hand and speech-like movements to detect AD risk. This study aims to [1] determine which combinations of hand-speech movement data most accurately predict preclinical AD [2], determine usability, reliability, and validity of TapTalk in cognitively asymptomatic older adults and [3], prospectively validate TapTalk in older adults who have cognitive symptoms against cognitive tests and clinical diagnoses of Mild Cognitive Impairment and AD dementia.
    Methods: Aim 1 will be addressed in a cross-sectional study of at least 500 cognitively asymptomatic older adults who will complete computerised tests comprising measures of hand motor control (finger tapping) and oro-motor control (syllabic diadochokinesis). So far, 1382 adults, mean (SD) age 66.20 (7.65) years, range 50-92 (72.07% female) have been recruited. Motor measures will be compared to a blood-based AD biomarker, phosphorylated tau 181 to develop an algorithm that classifies preclinical AD risk. Aim 2 comprises three sub-studies in cognitively asymptomatic adults: (i) a cross-sectional study of 30-40 adults to determine the validity of data collection from different types of smartphones, (ii) a prospective cohort study of 50-100 adults ≥ 50 years old to determine usability and test-retest reliability, and (iii) a prospective cohort study of ~1,000 adults ≥ 50 years old to validate against cognitive measures. Aim 3 will be addressed in a cross-sectional study of ~200 participants with cognitive symptoms to validate TapTalk against Montreal Cognitive Assessment and interdisciplinary consensus diagnosis.
    Discussion: This study will establish the precision of TapTalk to identify preclinical AD and estimate risk of cognitive decline. If accurate, this innovative smartphone app will enable low-cost, accessible screening of individuals for AD risk. This will have wide applications in public health initiatives and clinical trials.
    Trial registration: ClinicalTrials.gov identifier: NCT06114914, 29 October 2023. Retrospectively registered.
    MeSH term(s) Humans ; Female ; Aged ; Middle Aged ; Aged, 80 and over ; Male ; Alzheimer Disease/diagnosis ; Alzheimer Disease/epidemiology ; Alzheimer Disease/psychology ; Smartphone ; Prospective Studies ; Cross-Sectional Studies ; Reproducibility of Results ; Cognitive Dysfunction/diagnosis ; Biomarkers ; Amyloid beta-Peptides
    Chemical Substances Biomarkers ; Amyloid beta-Peptides
    Language English
    Publishing date 2024-04-16
    Publishing country England
    Document type Journal Article
    ZDB-ID 2041347-6
    ISSN 1471-2377 ; 1471-2377
    ISSN (online) 1471-2377
    ISSN 1471-2377
    DOI 10.1186/s12883-024-03609-z
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