Rheoencephalographic and electroencephalographic measures of cognitive workload: analytical procedures

Montgomery, Leslie D.; Montgomery, Richard; Guisado, Raul

doi:10.1016/0301-0511(95)05117-1

Cited by 23 publications

(20 citation statements)

References 14 publications

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“…An average (Fig. 4b) of 500 EKG pulses elucidates a 12% peak increase in blood flow, as well as a latency of 150ms between the R-peak and rCBF increase, consistent with previous studies (Montgomery et al, 1995; Basano et al, 2001). …”

Section: Resultssupporting

confidence: 89%

“…The pulsatile cerebrovascular response, synchronized to the EKG, is a strong and reliable signal that has been used to validate various novel non-invasive and invasive hemodynamic measurement techniques (Montgomery et al, 1995; Basano et al, 2001; Zhang et al, 2006; Kucewicz et al, 2007). In each of these studies, an increase in rCBF was observed after each cardiac pulse, with a latency of 100–200ms measured from the R-peak of the QRS wave to the initial increase in rCBF.…”

Section: Resultsmentioning

confidence: 99%

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Intracranial microprobe for evaluating neuro-hemodynamic coupling in unanesthetized human neocortex

Keller¹,

Cash²,

Narayanan³

et al. 2009

Journal of Neuroscience Methods

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Measurement of the blood-oxygen-level dependent (BOLD) response with fMRI has revolutionized cognitive neuroscience and is increasingly important in clinical care. The BOLD response reflects changes in deoxy-hemoglobin concentration, blood volume, and blood flow. These hemodynamic changes ultimately result from neuronal firing and synaptic activity, but the linkage between these domains is complex, poorly understood, and may differ across species, cortical areas, diseases, and cognitive states. We describe here a technique that can measure neural and hemodynamic changes simultaneously from cortical microdomains in waking humans. We utilize a "laminar optode," a linear array of microelectrodes for electrophysiological measures paired with a micro-optical device for hemodynamic measurements. Optical measurements include laser Doppler to estimate cerebral blood flow as well as point spectroscopy to estimate oxy-and deoxy-hemoglobin concentrations. The microelectrode array records local field potential gradients (PG) and multi-unit activity (MUA) at 24 locations spanning the cortical depth, permitting estimation of population trans-membrane current flows (Current Source Density, CSD) and population cell firing in each cortical lamina. Comparison of the laminar CSD/MUA profile with the origins and terminations of cortical circuits allows activity in specific neuronal circuits to be inferred and then directly compared to hemodynamics. Access is obtained in epileptic patients during diagnostic evaluation for surgical therapy. Validation tests with relatively well-understood manipulations (EKG, breath-holding, cortical electrical stimulation) demonstrate the expected responses. This device can provide a new and robust means for obtaining detailed, quantitative data for defining neurovascular coupling in awake humans.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Intracranial microprobe for evaluating neuro-hemodynamic coupling in unanesthetized human neocortex

Keller¹,

Cash²,

Narayanan³

et al. 2009

Journal of Neuroscience Methods

View full text Add to dashboard Cite

show abstract

“…Cognitive fatigue is defined as the unwillingness to continue performance of mental work in alert, motivated subjects, a notion which has been supported by behavioral studies (Montgomery et al, 1995). It can also be defined as a phenomenon characterized by reduction of performance after continuous workload accompanied by subjective experience of exhaustion.…”

Section: Introductionmentioning

confidence: 99%

Automatic recognition of cognitive fatigue from physiological indices by using wavelet packet transform and kernel learning algorithms

Zhang

Zheng

2009

Expert Systems with Applications

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“…Among them, three mental factors (Davies and Parasuraman, 1982), i.e., mental fatigue, mental workload, and mental effort, have been widely studied. Specifically, mental fatigue, also known as the time-on-task (TOT) effect (Borghini et al, 2014), reflects the unwillingness to perform cognitively demanding tasks (Montgomery et al, 1995). Mental workload is defined as objective task demand imposed on human operators (O'donnell and Eggemeier, 1994; Miyake, 2001), and usually measured as number of successive and/or simultaneous jobs that need to be performed (Wickens, 2015, 2002).…”

Section: Introductionmentioning

confidence: 99%

ICA-Derived EEG Correlates to Mental Fatigue, Effort, and Workload in a Realistically Simulated Air Traffic Control Task

2017

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Electroencephalograph (EEG) has been increasingly studied to identify distinct mental factors when persons perform cognitively demanding tasks. However, most of these studies examined EEG correlates at channel domain, which suffers the limitation that EEG signals are the mixture of multiple underlying neuronal sources due to the volume conduction effect. Moreover, few studies have been conducted in real-world tasks. To precisely probe EEG correlates with specific neural substrates to mental factors in real-world tasks, the present study examined EEG correlates to three mental factors, i.e., mental fatigue [also known as time-on-task (TOT) effect], workload and effort, in EEG component signals, which were obtained using an independent component analysis (ICA) on high-density EEG data. EEG data were recorded when subjects performed a realistically simulated air traffic control (ATC) task for 2 h. Five EEG independent component (IC) signals that were associated with specific neural substrates (i.e., the frontal, central medial, motor, parietal, occipital areas) were identified. Their spectral powers at their corresponding dominant bands, i.e., the theta power of the frontal IC and the alpha power of the other four ICs, were detected to be correlated to mental workload and effort levels, measured by behavioral metrics. Meanwhile, a linear regression analysis indicated that spectral powers at five ICs significantly increased with TOT. These findings indicated that different levels of mental factors can be sensitively reflected in EEG signals associated with various brain functions, including visual perception, cognitive processing, and motor outputs, in real-world tasks. These results can potentially aid in the development of efficient operational interfaces to ensure productivity and safety in ATC and beyond.

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Rheoencephalographic and electroencephalographic measures of cognitive workload: analytical procedures

Cited by 23 publications

References 14 publications

Intracranial microprobe for evaluating neuro-hemodynamic coupling in unanesthetized human neocortex

Intracranial microprobe for evaluating neuro-hemodynamic coupling in unanesthetized human neocortex

Automatic recognition of cognitive fatigue from physiological indices by using wavelet packet transform and kernel learning algorithms

ICA-Derived EEG Correlates to Mental Fatigue, Effort, and Workload in a Realistically Simulated Air Traffic Control Task

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