Abstract
In this work we present the first comprehensive survey of Brain Interface (BI) technology designs published prior to January 2006. Detailed results from this survey, which was based on the Brain Interface Design Framework proposed by Mason and Birch, are presented and discussed to address the following research questions: (1) which BI technologies are directly comparable, (2) what technology designs exist, (3) which application areas (users, activities and environments) have been targeted in these designs, (4) which design approaches have received little or no research and are possible opportunities for new technology, and (5) how well are designs reported. The results of this work demonstrate that meta-analysis of high-level BI design attributes is possible and informative. The survey also produced a valuable, historical cross-reference where BI technology designers can identify what types of technology have been proposed and by whom.
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Notes
To date, the terms Brain–Computer Interface (BCI), Brain–Machine Interface (BMI), Direct Brain Interface (DBI) and Adaptive Brain Interface (ABI) have all been used to describe human interface technology controlled by signals measured directly from the brain. In terms of high-level design, there is essentially no difference between the technologies referred to by these terms. Even though DBI is the most generic term, we have chosen to avoid using any of these terms to reduce interpretation bias in this work. Instead we will us the term Brain Interface as a collective term for this approach to interface technology.
Abbreviations
- AT:
-
acronym for assistive (or augmentative) technology
- Attribute Sub-Class:
-
sub-category of a design attribute. See Design Attribute. For examples, see Table 2
- Assistive Device:
-
the component of a Brain Interface (BI) that interacts directly with objects or people in the environment. For example, a speech synthesizer or an FES-based neuroprosthetic
- BI:
-
acronym for Brain Interface
- BI AT:
-
acronym for assistive (or augmentative) technology (AT) based on a Brain Interface (BI)
- BI Transducer:
-
a component of a Brain Interface that translates a person’s brain activity into usable control signals as shown in Fig. 1b–f. Functionally similar to other transducers like joysticks and switches
- Bio-recording Technology:
-
the class of equipment (sensors, amplifiers, converters and filters) used to measure a person’s brain activity in a BI Transducer
- Continuous (fixed reference):
-
a signal classification; a signal of this class is a sequence of continuous amplitude values relative to a fixed reference value-like the adjustable level produced by an analog potentiometer. See other signal classes: Relative Continuous (no reference), Discrete (...) and Spatial Reference
- Control Interface:
-
a component that is added to a BI Transducer that produces a relatively low dimensional output in order to expand the control dimensionality to a level required by an Assistive Device as depicted in Fig. 1c and f. See Table 1 for examples.
- Demonstration System:
-
an experimental system (depicted in Fig. 1e and f) that demonstrates control of a BI Transducer but does not otherwise perform any useful function
- Demo Device:
-
a device used to test the controllability of a BI technology in a demonstration system (see Fig. 1e and f). For example, a model vehicle or table-mounted robotic arm
- Design Attribute:
-
an attribute of a Brain Interface technology design. See Table 1 for the list of design attributes
- Discrete (with 1 NC state):
-
a signal classification; a signal of this class is a sequence of discrete states including one state that corresponds to the No Control state in the user. See No Control
- Discrete (all IC states):
-
a signal classification; a signal of this class is a sequence of discrete states where all states corresponds to intentional control in the user. See Intentional Control
- Discrete (with 1 unknown state):
-
a signal classification; a signal of this class is a sequence of discrete states where one state (the “unknown” state) is reserved for uncertain classifications
- Endogenous Transducer:
-
a BI Transducer design that responds to spontaneous control signals from the user
- Exogenous Transducer:
-
a BI Transducer design that responds to control signals evoked from the user using an external stimulator
- Feature Extractor:
-
a component of a BI Transducer that translates the input brain signal into a feature vector correlated to a neurological phenomenon. This component is sometimes referred to as noise reduction, filtering, preprocessing or spike detection/sorting
- Feature Translator:
-
a component of a BI Transducer that translates the feature vector into a useful control signal. This component is sometimes referred to as a Feature Classifier, Classifier or “decoding function” (or something similar)
- Intentional Control:
-
a user state when the user is attempting to affect the output of the Brain Interface
- IC:
-
acronym for Intentional Control
- Neurological Phenomenon:
-
the phenomenon (or phenomena) used to control a BI Transducer. For example, a P300 response in EEG to an oddball stimulus is a well-studied phenomenon employed in several BI Transducers. Another well-known phenomenon is the increase in neural firing rates measured in microelectrodes as neural activity increases
- No Control:
-
a user state when the user is not attempting to affect the output of the Brain Interface. For example, resting, monitoring, thinking, and daydreaming are all possible No Control states
- NC:
-
acronym for No Control
- Relative Continuous (no reference):
-
a signal classification; a signal of this class is a sequence of changes to previous amplitude values-like the output of a mouse. See Continuous (fixed reference)
- Spatial Reference:
-
a signal classification; a signal of this class is a sequence of 2-D spatial positions (similar to signals output by an eye tracker, a touchscreen or stylus mechanism)
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Acknowledgements
This work was conducted at the Neil Squire Society Brain Interface Laboratory in Vancouver, Canada, with support from the Canadian Institutes of Health Research grant MOP-62711, the Natural Sciences and Engineering Research Council of Canada, grant 90278-02. The authors would like to recognize Jaimie Borisoff and Adriane Randolph for their insightful feedback during the preparation of the manuscript. We would like to acknowledge that the second and third authors made equal contributions to this work.
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Appendix A: Identified Research Groups
Appendix A: Identified Research Groups
Table 4 lists the research groups used in this study identified by the last name of one principal investigator (PIs) from each group. For multi-institution projects, multiple PIs were listed. PIs were selected based on our knowledge or, for groups that were unfamiliar (marked with an * in the table), the last author from the reviewed papers was used. Affiliated institutions or projects are listed as the PIs latest published affiliation. (Our intent here is to provide a quick reference identifier for each group and this list is not meant as an accurate representation of principal investigators for these institutions or projects. We recognize that over time, researchers may change institutions from the ones listed).
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Mason, S.G., Bashashati, A., Fatourechi, M. et al. A Comprehensive Survey of Brain Interface Technology Designs. Ann Biomed Eng 35, 137–169 (2007). https://doi.org/10.1007/s10439-006-9170-0
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DOI: https://doi.org/10.1007/s10439-006-9170-0