Figure 2—figure supplement 1. | High performance communication by people with paralysis using an intracortical brain-computer interface

Open accessCopyright infoDownload PDFDownload figures

High performance communication by people with paralysis using an intracortical brain-computer interface

Figure 2—figure supplement 1.

Affiliation details

Stanford University, United States; Emory University and Georgia Institute of Technology, United States; Emory University, United States; Massachusetts General Hospital, United States; Brown University, United States; Rehabilitation R&D Service, Department of VA Medical Center, United States; Case Western Reserve University, United States; Louis Stokes VA Medical Center, United States; Harvard Medical School, United States
Figure 2—figure supplement 1.
Download figureOpen in new tabFigure 2—figure supplement 1. Data collection protocol for quantitative performance evaluation sessions.

Each research session followed a strict calibration and data collection protocol. This flow diagram is the research protocol for T6. T5 and T7’s protocols were very similar. T6 started with a glove-controlled movement calibration block (112 trials, 100 pixel target diameter, 750 ms hold time). T5 and T7 did not use data s, and instead that calibration block was substituted for a block where the cursor moved automatically while they attempted to move along with the cursor (‘open-loop’ calibration). This was followed by HMM click decoder calibration for T6. This was omitted for T7 as no HMM was used for sessions with him, but the cursor decoder was recalibrated at this stage. T5 did not need this either, as the HMM was trained on the same block as the cursor movement decoder. If the output of these two calibration steps resulted in a controllable cursor, then the data blocksets were started. Here, the decoders were recalibrated again based on a closed-loop control block, and data was collected under a strict timing protocol (see Figure 2—figure supplement 2). Blocksets were repeated as possible, at the discretion of the participant. Once a blockset was started for a particular research session, starting over with initial calibration was prohibited.

DOI: http://dx.doi.org/10.7554/eLife.18554.009