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2 results

  • 16 - More Discussion on the Harmonic Analysis and Fourier Analysis

  • Chunyan Li, Louisiana State University
  • Book:
    Time Series Data Analysis in Oceanography
    Published online:
    21 April 2022
    Print publication:
    05 May 2022, pp 279-307

  • Summary

    Harmonic analysis and Fourier analysis are fundamental tools for oceanographic time series data analysis. Both can be derived from the least squares method. They are different, however, in one major respect: Fourier analysis is based on a complete set of base functions, such that the convergence of relevant Fourier series is guaranteed for continuous functions. In contrast, harmonic analysis almost always has non-zero total error squared unless for pure deterministic functions with tidal frequencies only. This chapter provides additional discussion and some examples aimed at a better understanding of the concepts and techniques. The discussion will involve tidal harmonic analysis and Fourier analysis by contrasting them in concept and through some examples for harmonic analysis.

  • Time Perception in Mild Cognitive Impairment: Interval Length and Subjective Passage of Time

  • Sara Coelho, Manuela Guerreiro, Catarina Chester, Dina Silva, João Maroco, Miguel Coelho, Fabio Paglieri, Alexandre de Mendonça
  • Journal:
    Journal of the International Neuropsychological Society / Volume 22 / Issue 7 / August 2016
    Published online by Cambridge University Press:
    26 July 2016, pp. 755-764
  • Objectives

    Patients with mild cognitive impairment (MCI) may have difficulties in time perception, which in turn might contribute to some of their symptoms, especially memory deficits. The aim of this study was to evaluate perception of interval length and subjective passage of time in MCI patients as compared to healthy controls.

    Methods

    Fifty-five MCI patients and 57 healthy controls underwent an experimental protocol for time perception on interval length, a questionnaire for the subjective passage of time and a neuropsychological evaluation.

    Results

    MCI patients presented no changes in the perception of interval length. However, for MCI patients, time seemed to pass more slowly than it did for controls. This experience was significantly correlated with memory deficits but not with performance in executive tests, nor with complaints of depression or anxiety.

    Conclusions

    Memory deficits do not affect the perception of interval length, but are associated with alterations in the subjective passage of time. (JINS, 2016, 22, 755–764)