Spectrum occupancy-based PUEA detection using SVM-PSO in cognitive networks

Subcortical structures are in a strategic functional position within the cognitive networks and their lesion can interfere with a great number of functions. In this study, we describe fourteen subjects with exclusively subcortical vascular lesions (eight in the basal ganglia and six in the thalamus) and the interrelation between their language alterations and other cognitive abilities, as attention, memory and frontal executive functions. All patients were evaluated through the following batteries: Boston Diagnostic Aphasia Examination, Boston Naming Test, Token Test, Benton Visual Retention Test, Trail Making, Wisconsin Card Sorting Test and a frontal scripts task. All patients underwent MRI and twelve underwent SPECT. Results show that these patients present impairment in several cognitive domains, especially attention and executive functions. These alterations affect language abilities, and this fact must be considered in the rehabilitation efforts.

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The slow process: A hypothetical cognitive adaptation for distributed cognitive networks

Journal of Physiology-Paris ◽

10.1016/j.jphysparis.2007.11.006 ◽

2007 ◽

Vol 101 (4-6) ◽

pp. 214-222 ◽

Cited By ~ 12

Author(s):

Merlin Donald

Keyword(s):

Cognitive Networks ◽

Slow Process ◽

Cognitive Adaptation

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Signed graph based approach for on-line optimization in cognitive networks

2011 Third International Conference on Communication Systems and Networks (COMSNETS 2011) ◽

10.1109/comsnets.2011.5716470 ◽

2011 ◽

Author(s):

P Balamuralidhar ◽

M A Rajan

Keyword(s):

Cognitive Networks ◽

Signed Graph ◽

On Line

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Pain anticipatory phenomena in patients with central poststroke pain: a magnetoencephalography study

Journal of Neurophysiology ◽

10.1152/jn.00215.2016 ◽

2016 ◽

Vol 116 (3) ◽

pp. 1387-1395 ◽

Cited By ~ 7

Author(s):

Raghavan Gopalakrishnan ◽

Richard C. Burgess ◽

Scott F. Lempka ◽

John T. Gale ◽

Darlene P. Floden ◽

...

Keyword(s):

Chronic Pain ◽

Visual Cues ◽

Neural Substrates ◽

Cognitive Networks ◽

Therapeutic Approaches ◽

Pain Experience ◽

Time Frequency ◽

Cognitive Components ◽

Chronic Effects ◽

Integrated Approaches

Central poststroke pain (CPSP) is characterized by hemianesthesia associated with unrelenting chronic pain. The final pain experience stems from interactions between sensory, affective, and cognitive components of chronic pain. Hence, managing CPSP will require integrated approaches aimed not only at the sensory but also the affective-cognitive spheres. A better understanding of the brain's processing of pain anticipation is critical for the development of novel therapeutic approaches that target affective-cognitive networks and alleviate pain-related disability. We used magnetoencephalography (MEG) to characterize the neural substrates of pain anticipation in patients suffering from intractable CPSP. Simple visual cues evoked anticipation while patients awaited impending painful (PS), nonpainful (NPS), or no stimulus (NOS) to their nonaffected and affected extremities. MEG responses were studied at gradiometer level using event-related fields analysis and time-frequency oscillatory analysis upon source localization. On the nonaffected side, significantly greater responses were recorded during PS. PS (vs. NPS and NOS) exhibited significant parietal and frontal cortical activations in the beta and gamma bands, respectively, whereas NPS (vs. NOS) displayed greater activation in the orbitofrontal cortex. On the affected extremity, PS (vs. NPS) did not show significantly greater responses. These data suggest that anticipatory phenomena can modulate neural activity when painful stimuli are applied to the nonaffected extremity but not the affected extremity in CPSP patients. This dichotomy may stem from the chronic effects of pain on neural networks leading to habituation or saturation. Future clinically effective therapies will likely be associated with partial normalization of the neurophysiological correlates of pain anticipation.

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