Cite as:
Slavutskaya A V, Mikhailova E S, Konishev V A, 2006, "Human visual evoked potentials to bars and cross-like figures" Perception 35 ECVP Abstract Supplement

Human visual evoked potentials to bars and cross-like figures

A V Slavutskaya, E S Mikhailova, V A Konishev

Our study was aimed at the mechanisms of the first-order and second-order feature detection in the human visual cortex. For nineteen healthy subjects averaged visual evoked potentials (VEPs) to sets of bars and crosses with different orientation (0°, 45°, 90°, 135°) were recorded from 34 electrodes (system Neocortex-Pro, Neurobotics, Russia). Stimulus size was 18.8 deg, and its duration was 100 ms. VEPs in the visual areas show larger amplitudes and shorter latencies (P1, N2, and P3) for crosses than for bars. Different regional gradients were found for bars and crosses: lengthening of P1 peak latency from the occipital to the temporal cortex occurs mostly for bars, while P1 amplitude increase occurs mostly for cross-like figures. For the right inferior temporal lobe, our analysis of the VEP current source shows more activity to crosses than to bars. These observations are in good agreement with (i) bigger magnitude and shorter latencies of neuron responses to crosses vs bars in the cat striate cortex, (ii) sensitivity of cells in the monkey inferior-temporal cortex to star-like figures, and (iii) relatively better human recognition of incomplete figures with corners rather than with bars.
[Supported by RFBR grants 05-04-49649.]

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