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Journals ACM SIGBIO Newsletter Volume 17 Issue 1

A Software System for Analysis of Steady-State Evoked Potentials http://www.slc.edu/pages/m/mbelmont/Gnuroscan/ Matthew Belmonte mkb4@Cornell.edu ABSTRACT: A suite of computer programs tailored to the analysis of steady-state evoked potential data in attentional shifting experiments is described. Stimuli are sequenced pseudorandomly while maintaining constraints on overlapping of response windows. Averages of phase-locked and non-phase-locked steady-state amplitudes are computed in variable-length epochs and corrected for the effect of sampling noise. Various algebraic and combinational transformations of averaged data are implemented. Several parametric and nonparametric statistical tests are implemented, and the results of these procedures are visualised. An application of this software has revealed modulation of a steady-state visual evoked potential by spatial attention. The software has been designed with portability in mind, and many of the programs are applicable to more general problems in evoked potentials. INTRODUCTION A steady-state evoked potential (SSEP) is a continuously oscillatory potential generated by the brain in response to a periodic driving stimulus. Particularly good resonances are observed for the visual SSEP when stimuli are flashed at about 10s -1 [!] and for the auditory SSEP when clicks occur at about 40s -1 [2_]. Perturbations of the SSEP from its background amplitude and phase indicate changes in

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A software system for analysis of steady-state evoked potentials

Belmonte, Matthew
ACM SIGBIO Newsletter , Volume 17 (1)
Association for Computing Machinery – Apr 1, 1997

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