title: Nonlinear analysis in cognition process.
abstract: Cognition process is directly related to the brain functionality and is a dynamically changing system. Nonlinear analysis of EEG signals has been used as a means for studying the dynamical changes in cortical networks. In the course of cognition process, the activity complexity of the neuronal units is continually shifting. This phenomenon can be viewed with the topographic map and nonlinear EEG measures. The surrogate data method was used to show that EEG signals during cognitive activity are nonlinear. Additionally, we employ the compressed spectral array method to show that the gammaband EEG is closely related to cognitive processes.
authors.affiliation: Key Lab. of High Voltage Eng. & Electr. New Technol., Chongqing University Ministry of Education, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Yang
authors.forename: Chia-Jiu
authors.initials: CJ
authors.lastname: Wang
authors.forename: Yonghong
authors.initials: Y
authors.lastname: Wang
authors.forename: Heng-Ming
authors.initials: HM
authors.lastname: Tai