Studying Cognitive Cerebral Activity - Chapter 3: Event Related Cortical Activity
Studying Cognitive Cerebral Activity; Research on Artificial and Natural Intelligence, Jundiaí; Brasil, 2018.
29 Pages Posted: 21 May 2018
Date Written: May 6, 2018
Averaging (ve (s)) the electrical activity vke(s) recorded by each electrode while a volunteer (k) is performing a cognitive activity is a very common technique used by neuroscientist to study cortical computing. The averaging (v(s)) of (v(s)) is called Event Related activity and have provided very useful information about the brain activity supporting human cognition. In this chapter, ERA is calculated for many different cognitive tasks, ranging from language and video understanding to expert and financial decisions. The minimum duration of the EEG epoch for ERA calculation is 2 seconds and the maximum is 6 seconds. ERA was calculated for the EEG recorded after the beginning (as, for example, in language and visual understanding) or preceding the end (as, for example, in expert and financial decisions) the cognitive tasks. Polynomial regression analysis (PR) is used to disclose the patterns of activity of the studied ERAs. It is shown that large ERAs (longer than 2 seconds) may be segmented into a corresponding number of sequential ERAi of 2 seconds of duration. PR analysis reveals that these ERAi are, in turn composed by 4 different waves Wj having a duration around 500 Ms, each. Entrainment of the cortical oscillatory activity (see chapter 2) explains this ERAi segmentation and their components. ERAi and their different components are sequentially nested due to the oscillatory properties of the electrical activity of the neuronal and glial membranes (see chapter 2). It is proposed that cognitive cortical computation (COMP) is based on a sequential set of periodic processing modules (ERAi) of nested oscillatory activity associated to these Wj waves.
Keywords: ERA. Event Related Activity, Evoked Potential, Brain Processing, Cognition, Language, Vision, Decision making
Suggested Citation: Suggested Citation