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. 2014 May 30;8:105. doi: 10.3389/fnsys.2014.00105

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Copyright © 2014 Nassi, Gómez-Laberge, Kreiman and Born.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Contrast sensitivity is unaltered by feedback inactivation. (A) Contrast response functions plotted for two example units. The grating was restricted to the center of the receptive field. Data are shown as mean ± s.e.m., and curves were obtained using the Naka-Rushton model (inset equation) by fitting the parameters n and c₅₀. The spike rates for spontaneous activity (R₀) and maximum response (R_max) were measured. (B) Difference in parameter n between Feedback inactive and Control conditions. (C) Difference in parameter c₅₀ between Feedback inactive and Control conditions. Black triangle indicates population median (with two-tailed Mann-Whitney U-test p-value). Magenta and orange symbols indicate shifts for example units shown in (A). Feedback-inactivation did not lead to a systematic effect in contrast response function parameters.