NSCS 315A Lecture Notes - Lecture 3: Electrical Polarity, Correlation Does Not Imply Causation, Pyramidal Cell
8 Sep 2016
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Lecture 3 - covert attention and measuring brain activity. X-axis = delay between the cue and the target onset. Invalid = when arrow pointed in the wrong direction. Valid = when arrow pointed in the right direction. The above graph is based on our class data, however this experiment was carried out by posner in. Continuous recording of brain activity using sensors placed on the scalp. The sensors can pick up data from thousands of neurons per second. It consists of an oscillating voltage recorded on the scalp surface. The neurons are connected to each other and they are oscillating. These can then be divided into a number of frequency bands and be correlated to behavior: Seen when you close your eyes and relax (unless you are very anxious or clench your teeth) Primarily picked up in the occipital lobe. An eeg tells us about activity in the pyramidal cells because they are oriented.
