PSYC3317 Lecture Notes - Lecture 2: Medical Ultrasound, Posterior Cerebral Artery, Pulse Wave
Document Summary
Cathodal- decreases neuron firing rate, performance disrupting- acts of glutamate. Anodal- increases neuron firing rate, performance enhancing, acts on gaba. Tdcs- poorer temporal and spatial resolution than tms, can facilitate cog function, less discomfort. Single cell recordings- electrodes placed in or near a neuron- measure number of action potentials per second in response to a stimulus (invasive) Electrodes placed on the skull, measures summed electrical potentials from millions of neurons (sensitive to dendritic currents) Multi-cell recordings- the electrical activity in terms of action potentials per second of many individually recorded neurons. Face cells- respond at least twice as strongly to faces than other objects- 97% of cells were face selective. Functional trans cranial doppler ultrasonography- utilises pulse wave doppler technology to record blood flow velocities in the anterior middle and posterior cerebral arteries- useful to look at hemisphere organisation. Ftcdu- good temporal resolution, non invasive, easy to apply, robust against movement, good with a variety of patients including children.
