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This Defense Intelligence Reference Document was produced by the Defense Intelligence Agency's Defense Warning Office under the Advanced Aerospace Weapon System Applications program and dated 23 March 2010. It surveys noninvasive and invasive brain-machine interface technologies, including EEG, MEG, fMRI, NIRS and implanted electrode arrays, that could control external devices without limb-operated interfaces. It concludes that noninvasive electrical monitoring is the most promising near-term approach. For the long term it favors invasive single-neuron cortical connections.
From the source:Release of 2026-09-18 Incident: 3/23/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD surveys brain-machine interface technologies intended to allow users to control external devices without conventional manual controls, and it evaluates both noninvasive and invasive approaches for turning neural or related physiological signals into usable commands. The report reviews the underlying neural signals, distinguishes between open- and closed-loop control systems, and examines technologies including scalp-based electrical recording, magnetic and imaging-based methods, and implanted cortical interfaces, with particular attention to bandwidth, response time, signal quality, and practical usability. It concludes that, in the near term, the most practical systems are likely to be noninvasive electrical approaches that draw heavily on muscle and neural signals, while longer-term high-bandwidth control would likely require more advanced invasive interfaces capable of robust two-way communication with individual neurons. The document presents thought-based control of external devices as a research field with plausible assistive and specialized applications, while emphasizing that naturalistic, high-performance control remained constrained by major technical and physiological limits.
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CHRONIC NEURAL IMPLANTS AND FMRI
While developing microelectric neural chips for functional studies appears revolutionary
on the surface, it only presents a piece to the greater puzzle of understanding the
feasibility between neuroprosthetic chips and BMI development. For a BMI system to
succeed, researchers must understand the brain, its regions of activity and how those
area correlate to real time stimulation and neural responses, and how the brain may
evolve with training on use of the BMI. This will require the employment of sensitive
neural mapping devices such as fMRI.
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Figure 6. Implant Location. Cartoon shows location and orientation of the different electrode sites in the various
layers of an animal's neocortical implant (layer thicknesses are approximately scaled) . The gray band is the 200μm
separation region between the upper and lower layers of the neocortex.
To address this question, studies performed by Parikh et al., have targeted tissue
specific layers within the motor cortex region, essentially a modified ECoG, where
penetrating microelectrodes exh ibit the greatest functionality in cortical prosthetic
design (Reference 47). The interesting parameter of this experimental design is its
ability to successfully employ a behavioral task paradigm where electrodes could
accurately record brain activity and animal response based on audible and visual cues.
With this information the researchers discovered that the lower layers of the cortex are
more likely to encode directional information as compared to units in the upper layers.
This understanding has prompted the use of prosthetic neural implants as critical
instruments for developing accurate BMI models and the mapping all neurological
(brain triggered) responses.
For these experiments, accurate measurement of responses was placed solely into the
unique design of chronic implantable neural prosthetic devices. These devices enabled
investigation of activity in the upper or lower brain tissue layers, including whether
either had a preference for ipsilateral (same body side) versus contralateral (opposite
side of body) movement. In addition, chronic neural implants provided an innovative
method to target isolated brain regions. During this experiment a craniotomy was
performed over the target cortical area. In this procedure, a 2 mm diameter hole is
made into the skull to expose the dura mater. This dura matter is then removed to
reveal the cortical surface. An electrode scaffold array is inserted by hand with the use
of fine PTFE-coated forceps into the target cortical area. Typically, the electrode will be
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 36 pages are in the text index: search them above, or from the library's search.