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. 2014 Aug 6;8:92. doi: 10.3389/fncir.2014.00092

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Copyright © 2014 Mazurek, Kager and Van Hooser.

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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Sensitivity and specificity of the direction dot product test for detecting direction selectivity. (A) Repeated simulations were performed with a single cell at different levels of underlying DI and different numbers of trials; OI = 1 for all simulations. 16 angles (22.5° steps) were used; noise = 4 Hz at all conditions. Sensitivity of the direction dot product test was measured at three levels of significance: 95, 99, and 99.9%. (B) A cell was simulated with 7 trials at underlying DI = 0, OI = 1. The simulation was repeated 200,000 times and each time a p-value was measured against H0: DI = 0. The frequency of observed p-values was uniform between 0 and 1, which is what would be expected for an unbiased test by repeated sampling of cells that are indifferent to direction.