October 2003
Volume 3, Issue 9
Vision Sciences Society Annual Meeting Abstract  |   October 2003
Energy-frequency analysis reveals orientation-opponent channels in human vision
Author Affiliations
  • Isamu Motoyoshi
    McGill Vision Research Unit, Canada
Journal of Vision October 2003, Vol.3, 614. doi:https://doi.org/10.1167/3.9.614
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      Isamu Motoyoshi, Frederick A A Kingdom; Energy-frequency analysis reveals orientation-opponent channels in human vision. Journal of Vision 2003;3(9):614. https://doi.org/10.1167/3.9.614.

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      © ARVO (1962-2015); The Authors (2016-present)

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It has been suggested that the representation of global form and texture is subserved by visual mechanisms that integrate the outputs of 1st-order orientation-selective filters. We here directly characterized the input-orientation characteristics of such mechanisms using linear-system analysis. The stimulus was band-pass noise whose Fourier-energy was sinusoidally modulated across orientation (i.e., not across space). Sensitivity for detecting Fourier-energy modulation was measured for various orientation frequencies (1–20 cycle/pi), stimulus sizes (2.3–18.6 deg), and carrier spatial frequencies (0.9–6.9 cpd). An inverse Fourier transform of the sensitivity data revealed a strong centre-surround antagonism across orientation (excitatory centre within 6–9 deg and inhibitory lobes at 15–20 deg), that increased with stimulus size far beyond the size of orientation-selective filters (more than 64 times the spatial wavelength of the noise carrier). These results demonstrate the existence of 2nd-order mechanisms that integrate and differentiate 1st-order orientation signals over a wide area of the visual field when processing texture. We term these mechanisms ‘orientation-opponent’ channels, analogous to the colour-opponent channels in colour vision. We applied a similar analysis to the spatial-frequency domain, using fractal (1/f) noise whose Fourier energy was modulated across spatial frequency (1–5 cycle/octave). However, we failed to obtain clear evidence for ‘frequency-opponent’ channels.

Motoyoshi, I., Kingdom, F. A. A.(2003). Energy-frequency analysis reveals orientation-opponent channels in human vision [Abstract]. Journal of Vision, 3( 9): 614, 614a, http://journalofvision.org/3/9/614/, doi:10.1167/3.9.614. [CrossRef]

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