We studied the changes in amplitude of the first short latency positive potential (2.3 +/- 0.3 msec, mean +/- S.D.) of the direct cortical response (DCR) elicited by surface electrical stimulation of the motor cortex in anaesthetised baboons. Local cortical blood flow, measured by the hydrogen clearance method, was progressively reduced by acute middle cerebral artery occlusion and subsequent hypotension and was related to the amplitude of this potential. With flow levels greater than 25 ml/100 g/min the DCR was essentially unaffected, but it was lost with flows below 20 ml/100 g/min. These results indicate a threshold relationship between the generation of the electrical activity evoked in the cortical elements and local cortical flow, similar to that previously demonstrated for cortical somatosensory evoked potentials.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0168-5597(88)90031-7 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Frontopolar Cortex Interacts With Dorsolateral Prefrontal Cortex to Causally Guide Metacognition.
Hum Brain Mapp
February 2025
Department of Psychology, Ludwig Maximilian University Munich, Munich, Germany.
Accurate metacognitive judgments about an individual's performance in a mental task require the brain to have access to representations of the quality and difficulty of first-order cognitive processes. However, little is known about how accurate metacognitive judgments are implemented in the brain. Here, we combine brain stimulation with functional neuroimaging to determine the neural and psychological mechanisms underlying the frontopolar cortex's (FPC) role in metacognition.
View Article and Find Full Text PDFTopography of putative bi-directional interaction between hippocampal sharp-wave ripples and neocortical slow oscillations.
Neuron
January 2025
Neuroscience Institute, Langone Medical Center, New York University, New York, NY, USA; Department of Physiology and Neuroscience, Langone Medical Center, New York University, New York, NY, USA; Department of Neurology, Langone Medical Center, New York University, New York, NY, USA. Electronic address:
Systems consolidation relies on coordination between hippocampal sharp-wave ripples (SWRs) and neocortical UP/DOWN states during sleep. However, whether this coupling exists across the neocortex and the mechanisms enabling it remains unknown. By combining electrophysiology in mouse hippocampus (HPC) and retrosplenial cortex (RSC) with wide-field imaging of the dorsal neocortex, we found spatially and temporally precise bi-directional hippocampo-neocortical interaction.
View Article and Find Full Text PDFTau oligomers impair memory and synaptic plasticity through the cellular prion protein.
Acta Neuropathol Commun
January 2025
Department of Neuroscience, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Via Mario Negri 2, 20156, Milan, Italy.
Deposition of abnormally phosphorylated tau aggregates is a central event leading to neuronal dysfunction and death in Alzheimer's disease (AD) and other tauopathies. Among tau aggregates, oligomers (TauOs) are considered the most toxic. AD brains show significant increase in TauOs compared to healthy controls, their concentration correlating with the severity of cognitive deficits and disease progression.
View Article and Find Full Text PDFThe Anti-Neuroinflammatory Effects of Cepharanthine in Uric Acid-Induced Neuroinflammation.
J Ethnopharmacol
January 2025
Department of Pharmacology of Chinese Materia Medica, Institution of Chinese Integrative Medicine, Hebei Medical University, Research Unit of Digestive Tract Microecosystem Pharmacology and Toxicology, Chinese Academy of Medical Sciences, The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, Hebei Province 050017, China.
Ethnopharmacological Relevance: Cepharanthine (CEP) is an alkaloid extracted from Stephania cephalantha Hayata, a traditional Chinese medicine (TCM) renowned for its heatclearing and dehumidifying properties. For centuries, Stephania cephalantha Hayata has been employed in the treatment of a wide range of diseases, including pain, edema, inflammation, and fever.
Aim Of The Study: Our research aims to investigate the role and mechanism of Cepharanthine in ameliorating uric acid (UA) induced neuroinflammatory responses.
First-in-human experience performing high-resolution cortical mapping using a novel microelectrode array containing 1,024 electrodes.
J Neural Eng
January 2025
Precision Neuroscience, 54 W 21st Street, New York, New York, 10010, UNITED STATES.
Localization of function within the brain and central nervous system is an essential aspect of clinical neuroscience. Classical descriptions of functional neuroanatomy provide a foundation for understanding the functional significance of identifiable anatomic structures. However, individuals exhibit substantial variation, particularly in the presence of disorders that alter tissue structure or impact function.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!