"Neurovascular coupling may differ across cell types—for example, in neurons versus glia or in excitatory versus inhibitory neurons, and might be mediated by neuromodulators that are released by a minority of neurons."
"Some neurons appear to correlate positively, and others appear to correlate negatively, with local blood signals. Neurons with different activities and different coupling to blood supply would not be distinguishable in bulk measurements of neural activity."
"Studies of neurovascular coupling in different regions have measured activity with respect to disparate sensory stimuli or behavioural events, making it difficult to compare and assemble a unified view of neurovascular coupling across the brain."
Neurovascular coupling, which links blood supply to neuronal activity, shows variability across different brain regions and states. While some studies suggest consistent haemodynamic response functions (HRFs), others indicate weaker or negative responses in certain areas. Factors such as arousal, attention, and anticipation may influence blood supply independently of neuronal firing. Additionally, bulk measures of neural activity fail to capture the distinct correlates of different neuron types, complicating comparisons across studies. A comprehensive understanding of neurovascular coupling requires more precise measurements across various brain regions and conditions.
#neurovascular-coupling #haemodynamic-response-function #neuronal-activity #brain-regions #blood-supply
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