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This Article Full Text Full Text (PDF) All Versions of this Article: 556/3/971    most recent jphysiol.2003.058941v1 Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Jancke, D. Articles by Dinse, H. R. Search for Related Content PubMed PubMed Citation Articles by Jancke, D. Articles by Dinse, H. R.

¹ Institut für Neuroinformatik ND 04, Theoretische Biologie, Ruhr-Universität Bochum, D-44780 Bochum, Germany² Lehrstuhl für Allgemeine Zoologie und Neurobiologie ND 7, Ruhr-Universität Bochum, D-44780 Bochum, Germany³ Departamento de Matemática para C&T, Universidade do Minho, P-4800-058-Guimarães, Portugal

Psychophysical evidence in humans indicates that localization is different for stationary flashed and coherently moving objects. To address how the primary visual cortex represents object position we used a population approach that pools spiking activity of many neurones in cat area 17. In response to flashed stationary squares (0.4 deg) we obtained localized activity distributions in visual field coordinates, which we referred to as profiles across a ‘population receptive field’ (PRF). We here show how motion trajectories can be derived from activity across the PRF and how the representation of moving and flashed stimuli differs in position. We found that motion was represented by peaks of population activity that followed the stimulus with a speed-dependent lag. However, time-to-peak latencies were shorter by 16 ms compared to the population responses to stationary flashes. In addition, motion representation showed a directional bias, as latencies were more reduced for peripheral-to-central motion compared to the opposite direction. We suggest that a moving stimulus provides ‘preactivation’ that allows more rapid processing than for a single flash event.

(Received 28 November 2003; accepted after revision 19 February 2004; first published online 20 February 2004)
Corresponding author D. Jancke: Lehrstuhl für Allgemeine Zoologie und Neurobiologie, ND 7, Ruhr-Universität Bochum, D-44780 Bochum, Germany. Email: jancke{at}neurobiologie.ruhr-uni-bochum.de

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