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Linear frequency modulated visual evoked potential was explored in this paper, the stimulator, experimental paradigm, detection and analysis methods of visual evoked potential are generalized. The steady-state visual evoked potential can be seen as an specialization of linear frequency modulated visual evoked potential, which contains a set of linear frequency modulated signals corresponding to the stimulator, as well as steady-state visual evoked potential containing the fundamental and higher sine harmonics consistent with stimulus signal. In this work, time-frequency analysis methods, especially Fractional Fourier Transform which has a good focusing property for linear frequency modulated signals were used to detect the parameters of VEP evoked by LFM flash signal. The effectiveness of Fractional Fourier Transform for linear frequency modulated visual evoked potential shows feasibility and possibility for applications in brain-computer interface. Keyword-Visual Evoked Potential (VEP); Linear Frequency Modulated signal (LFM); Fractional Fourier Transform (FRFT); wigner distribution

Detection of Linear Frequency Modulated Flash Visual Evoked Potential by Fractional Fourier Transform