RECOGNeyes Gaze-Control Training

STUDY PURPOSE

RECOGNeyes is an eyetracker-controlled training game the researchers have developed in collaboration with young people with Attention Deficit/Hyperactivity Disorder (ADHD), their parents, and their teachers. It is designed to improve cognitive control in these conditions by training greater inhibitory top-down control over direction of gaze. The goal of this study is to establish whether there are grounds for confidence in the concept of gaze-control training as an approach to improving attentional control in conditions such as ADHD. The researchers will do this by investigating neural correlates of oculomotor control before and after RECOGNeyes gaze-control training, and evaluating the extent to which changes in these neural correlates themselves are associated with improved oculomotor control and with time spent training.

The researchers will use magnetoencephalography (MEG) recorded while participants undertake an antisaccade task, to evaluate electrophysiological correlates of oculomotor control. They will use resting state functional MRI to evaluate changes to functional connectivity between nodes of brain networks involved in visual attention and oculomotor control.

OBJECTIVES:

• To measure changes in electrophysiological event-related spectral perturbation (ERSPs) associated with topdown control of saccadic eye movements during an "antisaccade" task after participants have undertaken two weeks of RECOGNeyes training.
• To measure changes in resting state connectivity between brain regions involved in visual attention and oculomotor control.
• To correlate these neural changes with training gains (measured as improvements in antisaccade task performance) and with time spent training. Associations between neural changes and improved performance will indicate that improvements in oculomotor control are reflected in alterations to underlying neural function, while associations between time spent training, training gains, and neural changes will indicate that these changes are likely to reflect RECOGNeyes training effects.
• To explore the user experience of participating in the training and identify facilitators and barriers to using RECOGNeyes as a tool for gaze-control training.

PARTICIPANTS

The researchers plan to recruit at least 30 healthy volunteers from students accessing Academic Support Services at local further and higher education establishments in Nottingham. This strategy is designed to yield a sample of young adults that is enriched for inattentiveness. Posters and recruitment emails will be used to advertise the study. If the researchers are unable to recruit 30 volunteers from Academic Support Services, the researchers will also recruit from the general population by advertising more widely around the University of Nottingham.

The researchers will invite 8-12 of the participants to take part in qualitative interviews to explore their user experience with RECOGNeyes. Participants will be recruited for these interviews concurrently on completion of their follow-up scans, and recruitment for these interviews will cease upon data saturation.

STUDY DESIGN

Participants will attend the Sir Peter Mansfield Imaging Centre (SPMIC), University of Nottingham, on two occasions, before and after undertaking RECOGNeyes training at home over a period of two weeks. Over the training period, the researchers will provide the participants with a laptop computer on which the game is installed, together with a small USB eye-tracker that can be mounted under the laptop screen with a magnetic mount.

Each visit to SPMIC will include an MEG scan lasting approximately 40 minutes, during which they perform an antisaccade task; and a MRI scanning session that includes both an anatomical scan for co-registration with the MEG data to allow source localisation, and a short resting state functional scan (eyes open).

At the first visit only, after providing written consent to participate in the study, participants will complete the self-report Conners Adult ADHD Rating Scale (CAARS) (Conners et al. 1999). This will provide measures of the levels of inattention and hyperactivity/impulsivity in the participant sample. At both visits, participants will also complete two measures of reading efficiency: the TOWRE-2 standardised test of single word reading (Torgesen, 2011), which captures both word recognition efficiency using a list of real words, and phonetic decoding efficiency using a list of pseudo-words; and a custom task designed to measure eye-movement efficiency, in which they silently read three short passages of text while their eye movements are recorded. They will also, on both visits, complete the 12 item version of the General Health Questionnaire (GHQ12) (Goldberg \& Williams, 1988), to assess their general mental health and to allow researchers to evaluate whether gaze-control training has had any impact on their mental wellbeing, whether positive or adverse.

The antisaccade task performed in the MEG scanner consists of 40 blocks of six trials. Twenty of these blocks are "prosaccade" blocks in which participants have to make a saccadic eye movement from a central fixation cross to a stimulus presented either to right or left of fixation. The other 20 blocks are "antisaccade" blocks, in which they have to make a counter-intuitive saccade in the opposite direction to the peripheral stimulus. Each stimulus is preceded by a warning cue 800ms earlier, to allow them to prepare to make their saccadic response. After their response is completed, they receive feedback as to whether their saccade was correct or incorrect, and whether it was made within the time limit. They are awarded a point for a timely saccade in the correct direction, and a point is deducted for an incorrect or late response. Block type order is randomised, and blocks are separated by rest periods.

For those recruited to participate in the qualitative interview, this takes place on a third visit to the University of Nottingham, and lasts approximately one hour.

RANDOMISATION AND BLINDING

Participants are randomly assigned to undertake two, three or four training sessions per week for two weeks (training sessions to last 20-30 minutes), at home. Randomisation will be stratified by age, gender and nature of academic difficulty (e.g. ADHD; dyslexia) on a rolling basis as volunteers are recruited. Training instructions will be given to volunteers in a sealed envelope, and investigators involved in pre- and post-intervention measurements will remain blind to training schedule allocation until after data have been processed (CAARS, reading, and GHQ12 measures scored; MEG, eye-tracker and fMRI data pre-processed).

This randomised scheduling protocol is designed to produce variability between participants in the amount of time spent training, so that changes in outcome measures before and after training can be correlated with actual time spent training, and thus provide the researchers with evidence as to whether training gains and/or neural changes observed after the two-week training period are attributable to RECOGNeyes training, rather than simply to greater familiarity with the outcome measure assessment procedures on the second visit.

The Chief Investigator (Dr. Elizabeth Liddle) will maintain a record of which volunteers have been allocated to which training schedule. Volunteers will be given her contact details so that if they experience any problem with their training or training schedule, they can to contact her directly for help.

TRAINING COMPLIANCE

The RECOGNeyes software installed on the laptops will log the time participants begin and end each training session, and will be used to quantify the actual training time achieved by each participant.

PARTICIPANT WITHDRAWAL

Participants may be withdrawn from the study either at their own request or at the discretion of the researchers. The participants will be made aware that this will not affect their future care. Participants who withdraw early in the study may be replaced.

DATA ANALYSIS PLAN

This study was designed, in accordance with the funding call (MRC Confidence in Concept), as an exploratory study to provide evidence that RECOGNeyes training can result in changes to brain networks involved in cognitive control. As an exploratory, proof-of-concept study, the study has not been powered to find effects of specified size. Instead, the researchers will look at a range of possible indicators of the impact of RECOGNeyes training on cognitive control capacity, with a hierarchy of hypothesised effects to test for. Using MEG, Hwang et al.(2014) have shown that when participants prepare to make an antisaccade, oscillatory activity associated with functional inhibition increases in a brain region associated with top-down control (right dorsolateral prefrontal cortex), and is causally coupled with oscillatory activity in the frontal eye-fields, brain regions implicated in saccade generation. In a later study, Hwang et al. (2016) also demonstrated that these oscillatory correlates of top-down saccadic control develop over adolescence, suggesting that they may index cognitive control capacity, and, specifically, capacity to control direction of gaze. If RECOGNeyes training is successful in modulating this capacity, training gains should be correlated with changes in these correlates of top-down saccadic control. Therefore, the researchers plan to test for linear correlations between both training gains, as measured by antisaccade task performance, and/or training exposure (time actually spent training, calculated from game logs), and changes on our outcome measures.

The qualitative data gained from Day 3 will be analysed using thematic analysis (Braun \& Clarke, 2006). This is a flexible approach that allows for the integration of both a deductive and inductive lens upon the data, enabling a combination of both theoretical views already known to the researchers, and the emergence of new themes introduced by the participants. Data will be managed using a framework approach, allowing for comparisons and contrasts to be drawn between and across cases in the data set.

ADVERSE EVENTS

Adverse events as a result of RECOGNeyes training are not expected. The research MRI scan is not the same as a routine clinical scan and therefore cannot be used to make a clinical diagnosis. However, there is a small chance of an incidental finding of potential clinical significance. This chance will be made known to participants as part of the consent process. The SPMIC has a standard operating procedure for such occurrences. If any scans reveal anything that suggests a possible clinical abnormality, the researchers will notify the participant's GP so that he or she can arrange any further investigations that might be indicated.

PUBLICATION AND DISSEMINATION

Results from this study will be published in academic journals. Participants will be informed that they may request copies of any published articles related to this study and that they will not be identified in any report or publication.

USER AND PUBLIC INVOLVEMENT

The RECOGNeyes gaze-control training programme and study design were developed in close collaboration with Patient and Public Involvement (PPI) groups.

FUNDING

This study is funded by the University of Nottingham via the Medical Research Council (MRC) Confidence-in-Concept (CiC) awards.