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Methods Inf Med 1994; 33(01): 46-48
DOI: 10.1055/s-0038-1634990
Original Article
Schattauer GmbH

Time-Varying Properties of Respiratory Fluctuations in Pupil Diameter of Human Eyes

H. Yoshida
1   Department of Electrical Engineering, College of Engineering, Hosei University
,
K. Yana
1   Department of Electrical Engineering, College of Engineering, Hosei University
,
F. Okuyama
2   Department of Ophthalmology, School of Medicine, Tokyo Medical and Dental University, Japan
,
Takashi Tokoro
2   Department of Ophthalmology, School of Medicine, Tokyo Medical and Dental University, Japan
› Author Affiliations
Further Information

Publication History

Publication Date:
08 February 2018 (online)

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Abstract:

The time varying properties have been investigated of respiratory components in fluctuations of the pupil diameter (PDF) of the human eye. PDF and instantaneous lung volume were simultaneously measured for 45 minutes under natural binocular viewing conditions. The short-term Fourier transform and the autoregressive signal modeling together with the recursive least squares algorithm have been applied for the estimation of nonstationary power spectra. Data analysis showed a bursting type non-sta-tionarity in the appearance of the respiratory component in PDF.

Keywords

Pupil Diameter - Instantaneous Lung Volume - Autonomic Nervous Activity - Adaptive Signal Processing - Spectral Analysis
 

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