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The relationship between temporal phase discrimination ability and the frequency doubling illusion.

Kunjam Vallam1, Andrew B Metha

  • 1Department of Optometry & Vision Sciences, The University of Melbourne, Carlton, Victoria, Australia. kunjam.vallam@anu.edu.au

Journal of Vision
|January 26, 2008
PubMed
Summary

The frequency doubling illusion (FDI) may stem from impaired temporal phase encoding. This study found that temporal phase discrimination thresholds increase with flicker rate for low spatial frequencies, supporting this theory.

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Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • The frequency doubling illusion (FDI) increases apparent spatial frequency with high temporal modulation.
  • A recent hypothesis links FDI to frequency-dependent temporal phase encoding deficits.

Purpose of the Study:

  • To investigate the relationship between temporal phase encoding and FDI.
  • To explore spatiotemporal characteristics of temporal phase discrimination (TPD) thresholds.

Main Methods:

  • A novel stimulus with three grating patches in a triangular pattern was used.
  • Temporal phase discrimination thresholds were measured across various spatial frequencies (0.25, 0.50, 2.20 cpd) and temporal frequencies (1-28 Hz).
  • Stimuli were presented at different contrast levels (2x, 4x, 8x orientation identification thresholds).

Main Results:

  • TPD thresholds were variable at low contrasts.
  • At higher contrasts, TPD thresholds increased with flicker rate for 0.25 and 0.50 cpd gratings.
  • These findings were consistent across all subjects.

Conclusions:

  • The results support the hypothesis that FDI is related to a frequency-dependent loss of temporal phase encoding.
  • Impaired temporal phase encoding at higher temporal frequencies may underlie the FDI.