COGS 2160 Chapter Notes - Chapter CS 11.5 (pp.352-358): Local Field Potential, Three Steps, Cerebral Cortex

• School: York University
• Department: Cognitive Science
• Course: COGS 2160
• Professor: Muhammad Ali Khalidi

Document Summary

Fmri measures the bold signal, while pet measures cerebral blood flow. The issue with neuroimaging is that little is known about the connections between what we can observe directly and what we are trying to measure indirectly. The bold signal and information processing in the brain. We don"t have generally accepted models of how populations of neurons process info in particular brain areas either as a function of their firing rates or as a function of their local field potentials. Bold does not give us indication on whether the activity is measured excitatory and inhibitory. Noise in the system? fmri the basic spatial unit is called the voxel. This can distort the signal, giving rise to what are known as partial volume effects. Many different atlases which makes contrasting and comparing different studies difficult. Functional connectivity vs. effective connectivity principle of segregation = the cerebral cortex is divided into segregated areas with distinct neuronal populations.