Multimodal wearable measurement systems and methods
An illustrative multimodal measurement system includes a wearable assembly configured to be worn by a user; and a module configured to be removably inserted into the wearable assembly and comprising: a housing, a printed circuit board (PCB) and a light guide assembly configured to emit light directed at a target within the user. The light guide assembly comprises: a lower light guide portion housed within the housing and having a proximal end attached to the PCB, a conductive spring member housed within the housing and comprising a coil positioned around an external surface of the lower light guide portion, and a conductive upper light guide portion connected to the lower light guide portion and configured to protrude from an upper surface of the housing and be in contact with a surface of a body of the user.
1. A multimodal measurement system comprising:
a wearable assembly configured to be worn by a user; and
a module configured to be removably inserted into the wearable assembly and comprising:
a housing,
a printed circuit board (PCB) housed within the housing, and
a light guide assembly configured to emit light directed at a target within the user, the light guide assembly comprising:
a lower light guide portion housed within the housing and having a proximal end attached to the PCB,
a conductive spring member housed within the housing and comprising a coil positioned around an external surface of the lower light guide portion, and
a conductive upper light guide portion connected to the lower light guide portion and configured to protrude from an upper surface of the housing and be in contact with a surface of a body of the user, the conductive upper light guide portion conductively coupled to circuitry on the PCB by way of the conductive spring member and configured to function as an electrode that detects electrical activity of the target.
2. The multimodal measurement system of claim 1 , wherein the module further comprises a set of detectors configured to detect arrival times for photons of the light after the light is scattered by the target.
3. The multimodal measurement system of claim 2 , further comprising a processing unit configured to generate optical measurement data based on the arrival times detected by the set of detectors and electrical measurement data based on the electrical activity detected by the conductive upper light guide portion configured to function as the electrode.
4. The multimodal measurement system of claim 3 , wherein the optical measurement data comprises time-domain functional near infrared spectroscopy (fNIRS) data and the electrical measurement data comprises electroencephalogram (EEG) data.
5. The multimodal measurement system of claim 3 , wherein the processing unit is further configured to process the optical measurement data and the electrical measurement data in accordance with a data fusion heuristic to generate an estimate of cortical source activity.
6. The multimodal measurement system of claim 5 , wherein the generating of the estimate of the cortical source activity is performed in real-time while the set of detectors is detecting the arrival times and the conductive upper light guide portion configured to function as the electrode is detecting the electrical activity.
7. The multimodal measurement system of claim 3 , wherein the processing unit is included in the wearable assembly.
8. The multimodal measurement system of claim 3 , wherein the processing unit is not included in the wearable assembly.
9. The multimodal measurement system of claim 1 , wherein the wearable assembly comprises a slot surrounded by a wall, and wherein the module is configured to be removably inserted into the slot.
10. The multimodal measurement system of claim 1 , further comprising:
an additional module configured to be removably inserted into the wearable assembly and comprising an additional light guide assembly configured to emit additional light directed at the target.
11. The multimodal measurement system of claim 10 , wherein the additional module further comprises an additional set of detectors configured to detect arrival times for photons of the additional light after the additional light is scattered by the target.
12. The multimodal measurement system of claim 10 , wherein the additional light guide assembly comprises an additional conductive upper light guide portion configured to function as an electrode that detects the electrical activity of the target.
13. The multimodal measurement system of claim 10 , wherein the additional light emitted by the additional light guide assembly has a wavelength different than a wavelength of the light emitted by the light guide assembly.
14. The multimodal measurement system of claim 1 , further comprising an electrode on a surface of the module.
15. The multimodal measurement system of claim 1 , wherein the conductive upper light guide portion configured to function as the electrode is conductively isolated from a remaining number of electrodes of the multimodal measurement system to create at least two channels.
16. The multimodal measurement system of claim 1 , wherein the electrical activity comprises electroencephalogram (EEG) activity.