Comparisons of fitted time series obtained from the GLM for ROIs in awake dogs.

<p>The ROIs are in brain regions that were activated by low and high odor concentration, as well as parametric modulation by odor intensity in awake dogs. These regions are olfactory bulb and cerebellum, which are shown in bold face in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086362#pone-0086362-t003" target="_blank">Tables 3</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086362#pone-0086362-t004" target="_blank">4</a>, and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0086362#pone-0086362-t006" target="_blank">6</a>. In each of these regions, the ROI was determined by a sphere which centers at the peak activation of parametric modulation and has a radius of 2 mm. Fitted time series for low concentration are shown in blue, and high concentration in red.