Christopher J. Soraghan

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This article brings together the various elements that constitute the signal processing challenges presented by a hemodynamics-driven functional near-infrared spectroscopy (fNIRS) based brain-computer interface (BCI). We discuss the use of optically derived measures of cortical hemodynamics as control signals for next generation BCIs. To this end we present(More)
OBJECTIVES To compare the patterns of blood pressure (BP) behavior during orthostasis in individuals with mild cognitive impairment (MCI) with those of controls and to investigate whether orthostatic BP behavior differs between individuals with MCI who convert to dementia and those who do not. DESIGN Longitudinal study with 3 years of follow-up. SETTING(More)
The Irish Longitudinal Study on Ageing (TILDA) collected phasic blood pressure (pBP) data on over 5,000 participants in Wave 1. This required a Signal Processing Framework (SPF) for automating: 1) artefact rejection, and, 2) the extraction of clinically-useful features. The framework developed reduced the workload of the screening clinician by 43%. The work(More)
A dedicated triple wavelength LED driver is presented for optical brain–computer interfacing (BCI). The solution caters for the constraints of a common-anode grounded case and modulation up to several kilohertz that allows source separation of light that has backscattered from the brain. With total harmonic distortion of 0.95% and a frequency range of 40(More)
OBJECTIVE To create and validate a frailty assessment tool for community-dwelling adults aged ≥75 years. DESIGN Longitudinal, population-based study. SETTING The Survey of Health, Ageing and Retirement in Europe (SHARE). PARTICIPANTS 4001 women and 3057 men aged ≥75 years from the second wave of SHARE. 3325 women and 2587 men had complete information(More)
BACKGROUND In this report, we provide the first normative reference data and prevalence estimates of impaired orthostatic blood pressure (BP) stabilization, initial orthostatic hypotension, and orthostatic hypotension based on beat-to-beat blood pressure methods in a population-representative sample. METHODS AND RESULTS Participants were recruited from a(More)
This paper describes a concept for the extension of constraint-induced movement therapy (CIMT) through the use of feedback of primary motor cortex activity. CIMT requires residual movement to act as a source of feedback to the patient, thus preventing its application to those with no perceptible movement. It is proposed in this paper that it is possible to(More)
This paper describes the control system of a next-generation optical brain-computer interface (BCI). Using functional near-infrared spectroscopy (fNIRS) as a BCI modality is a relatively new concept, and research has only begun to explore approaches for its implementation. It is necessary to have a system by which it is possible to investigate the signal(More)
This paper describes a safety assessment study of near-infrared sources used in an optical brain-computer interface (BCI). The measurement elements of an optical BCI consist of sets of optical sources and detectors. Our current system utilises sources which comprise of dual wavelength light emitting diodes (LED) at 760nm and 880nm. An optical analysis(More)
Engineers tend to confine themselves to designing technology for users in the lab. The authors wished to explore exposure to the real-world technology needs of older people by assessing technology use (via a universal design questionnaire) in the older person's own home. Following a series of home visits to older people and interviewing them on technology(More)