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Closed-loop training of attention with real-time brain imaging

Abstract

Lapses of attention can have negative consequences, including accidents and lost productivity. Here we used closed-loop neurofeedback to improve sustained attention abilities and reduce the frequency of lapses. During a sustained attention task, the focus of attention was monitored in real time with multivariate pattern analysis of whole-brain neuroimaging data. When indicators of an attentional lapse were detected in the brain, we gave human participants feedback by making the task more difficult. Behavioral performance improved after one training session, relative to control participants who received feedback from other participants' brains. This improvement was largest when feedback carried information from a frontoparietal attention network. A neural consequence of training was that the basal ganglia and ventral temporal cortex came to represent attentional states more distinctively. These findings suggest that attentional failures do not reflect an upper limit on cognitive potential and that attention can be trained with appropriate feedback about neural signals.

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Figure 1: Real-time pipeline.
Figure 2: Brain-behavior relationship.
Figure 3: Change in behavior.
Figure 4: Searchlight analyses.
Figure 5: Potential sources of feedback.

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Acknowledgements

This work was supported by US National Institutes of Health grant R01EY021755, US National Science Foundation (NSF) grant BCS1229597, NSF fellowship DGE1148900 and the John Templeton Foundation. The opinions expressed in this publication are those of the authors and do not necessarily reflect the views of these funding agencies.

Author information

Authors and Affiliations

Authors

Contributions

M.T.dB., J.D.C., K.A.N. and N.B.T.-B. designed the experiment, discussed the data and wrote the paper. M.T.dB. and R.F.L. developed data acquisition and analysis tools. M.T.dB. collected and analyzed the data. All authors read and commented on the manuscript.

Corresponding author

Correspondence to Nicholas B Turk-Browne.

Ethics declarations

Competing interests

The authors declare no competing financial interests.

Integrated supplementary information

Supplementary Figure 1 Study procedure.

(a) Participants completed three sessions on different days, with different numbers of task runs. (b) Each run contained eight blocks of the sustained attention task. The pre-training, post-training, and stable blocks of the rtfMRI training sessions contained composite stimuli with an equal mixture of faces and scenes. In the feedback blocks of the rtfMRI session, the mixture of images was determined by real-time analysis of brain activity. (c) Each block began with a cue (1 s) that indicated the attended category (e.g., scene) and target subcategory (e.g., indoor). This was followed by a brief fixation period (1 s) and then 50 sequential stimuli (1 s each, no interstimulus interval), of which 90% were targets and 10% were lures. The blocks ended with a fixation period (4–6 s).

Supplementary Figure 2 Average RTs surrounding lures.

Green lines correspond to trials around correct rejections (CRs), where there was no behavioral response to the lure (presented at time = 0). Red lines correspond to trials around false alarms (FAs), where participants mistakenly responded to the lure. RTs were significantly slower prior to CRs than FAs (all timepoints, ps < 0.00001), consistent with the idea that FAs occurred when participants started responding habitually and were less attentive to the task. Error bars represent +/–1 s.e.m.

Supplementary Figure 3 Removing the influence of RT.

Both RT and classifier evidence for the task-relevant vs. task-irrelevant category were higher preceding CRs. To verify that the classifier was predictive of behavioral accuracy and not merely correlated with RT, we regressed RT out of classifier output and behavioral accuracy across trials and performed a partial correlation analysis. Green lines correspond to regression fits for feedback participants, and blue lines correspond to regression fits for control participants. The black line is the average fit. The relationship between classifier output and behavioral accuracy remained robust (p < 0.00001).

Supplementary Figure 4 Classifier-to-stimulus transfer function.

The volume-by-volume classifier output for the task-relevant minus task-irrelevant category was mapped to the proportion of the image from the task-relevant category using a sigmoidal function. The inflection point on the classifier axis was set to 0.60, based on the average decoding accuracy in a pilot study. Given the nonlinearities in the function, this helped calibrate the feedback to a more sensitive range of classifier values. Image proportion ranged from 0.17 to 0.98, preventing the task-relevant image from ever disappearing completely, and providing a foothold for recovery from a serious lapse.

Supplementary Figure 5 Histogram of feedback.

The bottom x-axis refers to proportion of the image from the task-relevant category in each composite stimulus. The y-axis refers to the number of TRs that contained stimuli with this mixture (in bins of width = 0.04) across all feedback blocks from all participants in the feedback group. The top x-axis depicts the correspondence between classifier output and feedback (computed using the transfer function in Supplementary Fig. 4). The most frequent values were in the highest and lowest bins, as well as in the bin including feedback of 0.5. The highest bin reflects cases in which the image from the task-relevant category was 98% of the composite stimulus. The lowest bin reflects cases in which the image from the task-irrelevant category was 83% of the composite stimulus. The bin with 0.5 was frequent because every block began with an equal mixture of the images from the task-relevant and task-irrelevant categories.

Supplementary information

Supplementary Text and Figures

Supplementary Figures 1–5 (PDF 1239 kb)

Supplementary Methods Checklist (PDF 484 kb)

Example neurofeedback block.

This video depicts the real-time data analysis and stimulus-updating procedure during a feedback block. In this block, the participant was instructed to attend to scenes and respond when a scene was indoors. The left window shows what the participant saw. The top-right window shows the real-time fMRI estimate of the participant's attentional state (classifier evidence for task-relevant minus task-irrelevant categories; here, scene minus face outputs). The bottom-right window shows the mixture proportions of the composite stimuli. The mixture was initialized at 50% face/50% scene, and then updated on the basis of a moving window of classifier evidence over the preceding three volumes using a transfer function. (MOV 5100 kb)

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deBettencourt, M., Cohen, J., Lee, R. et al. Closed-loop training of attention with real-time brain imaging. Nat Neurosci 18, 470–475 (2015). https://doi.org/10.1038/nn.3940

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