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Updated: Jun 13, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
Published on: August 22, 2025
An independent effect of spatial frequency on motion integration reveals orientation resolution
Linda Bowns1, Alexander J S Beckett
1School of Psychology, University of Nottingham, University Park, Nottingham NG7 2RD, UK. l.bowns@psychology.nottingham.ac.uk
Problem:
To investigate the independent role of spatial frequency on component motion integration.
Method:
Two Type II plaids were presented at varying spatial frequencies. The velocity vectors of the underlying components were constructed so that predicted speed and direction from the components; the Intersection of Constraints; the vector average; and distortion products, remained constant for each of the two plaids across spatial frequency. Perceived direction was measured using a method of adjustment.
Results:
Perceived direction changed as a function of spatial frequency, approaching the pattern direction only at spatial frequencies greater than 0.5cpd.
Conclusions:
Spatial frequency has an independent effect on the component integration stage that determines perceived pattern motion direction. The results appear to reflect the resolution of orientation for recombination of the components at low spatial frequencies. These results have implications for motion modelling and possible clinical applications.
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