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Optica Applicata

Tytuł artykułu

Time-frequency analysis of spontaneous fluctuation of the pupil size of the human eye

Autorzy Nowak, W.  Hachoł, A.  Kasprzak, H. 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN The aim of this work has been to develop a new method of variability description for the spontaneous pupillary fluctuation (SPF) signal, based on the time-frequency analysis. In the work we have studied the variability of the SPF signal spectrum. Based on the PSS (Kwiatkowski, Philips, Schmidt, Shin) test, it has been shown that the SPF signal is non-stationary. A method of SPF signal variability analysis has been proposed using the STFT in the time- frequency domain, and then quantitative variability measures have been introduced to the obtained spectrograms. The application of fast pupillometry for recording the SPF allowed to expand the analyzed frequency band to 20 Hz. The proposed method of analysis and introduced measures of SPF variability enable the detection and quantitative description of short-lasting time-frequency and time-amplitude variations that remain obscured by the overall spectral analysis. SPF signal analysis methods and exemplary results obtained with the methods are presented in the paper.
Słowa kluczowe
EN spontaneous pupillary fluctuation   spectral analysis   time-frequency representation   signal nature  
Wydawca Oficyna Wydawnicza Politechniki Wrocławskiej
Czasopismo Optica Applicata
Rocznik 2008
Tom Vol. 38, nr 2
Strony 469--480
Opis fizyczny Bibliogr. 23 poz.
autor Nowak, W.
autor Hachoł, A.
autor Kasprzak, H.
  • Faculty of Basic Problems of Technology, Institute of Biomedical Engineering and Instrumentation, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland,
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