Direction tuning of human motion detection determined from a population model

The European Journal of Neuroscience
J Peter MaurerM Bach

Abstract

Mass responses that are obtained using electrophysiological or psychophysical techniques are inadequate to characterize motion detectors at the single-unit level. Therefore, we have modelled a population of motion detectors and fitted their mass response to motion-onset EEG data. By examining a single unit of the modelled population we could assess the range of directions and the level of adaptation an individual motion detector responded to. Stimuli were patterns of randomly distributed dots. After subjects had adapted to either a non-moving pattern or to motion in one fixed direction, the pattern moved in one of seven possible test directions. The population model assumed elementary motion detectors with a Gaussian angle-selectivity profile. The population response was calculated as the sum of all adaptation-weighted individual responses to the test direction. In all subjects, we observed sizeable effects of adaptation on test directions close to the adapted direction and small amounts of direction-independent adaptation for all test directions. The model fit explained 75% (Oz) and 94% (lateral derivation) of the total variance and revealed a motion detector bandwidth (full width at half maximum) of 72 degrees (Oz) and 62 deg...Continue Reading

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Citations

Dec 6, 2005·Experimental Brain Research·Sven P HeinrichMichael Bach
Apr 14, 2007·Documenta Ophthalmologica. Advances in Ophthalmology·Sven P Heinrich
Jun 2, 2007·Documenta Ophthalmologica. Advances in Ophthalmology·Jan KremlácekJana Szanyi
Oct 16, 2015·The European Journal of Neuroscience·Ramona GrzeschikStephan Getzmann
Nov 18, 2005·Vision Research·J KremlácekJ Langrová
Apr 23, 2005·Vision Research·Sven P HeinrichMichael Bach

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