MSSD Group Comparisons.

<p>MSSD contrast maps for motor reaction (a) and visuo-spatial (b) task. Yellow/red regions indicate significantly (<i>p</i> < 0.05, whole brain corrected) greater BOLD variability in professional as compared to naïve drivers. No regions showed significantly greater MSSD in naïve drivers.</p

Brain activation results.

<p>(a) Brain activations in left (top) and right (bottom) hemispheres of professional (blue/yellow scale) and naive (gray shadow) drivers during motor reaction (1st column) and visuo-spatial (2nd column) tasks computed at whole brain corrected <i>p</i> < 0.05. (b) Left (top) and right (bottom) hemispheres activation contrast maps for the two tasks, where blue color corresponds to regions significantly more activated in naive as compared to professional drivers, while red color corresponds to regions significantly more activated in the professional drivers group (<i>p</i> < 0.05, whole brain corrected).</p

Behavioural results.

<p>Behavioural performance of professional (red) and naïve (blue) drivers during the motor reaction task (a) and the visuo-spatial task (b). Average reaction time and mean error rate (± SE) are shown in the graphs. No significant differences between the two groups have been observed. </p

Connectivity Group Comparisons.

<p>Statistical map of between group comparisons derived from path coefficients and t-statistics obtained using multivariate autoregressive analysis (MAR) during (a) the motor reaction and (b) the visuo-spatial task. Red and blue arrows respectively indicate significantly greater positive and negative influence on target regions for which a within group effect was also present (<i>p</i> < 0.05). Here are shown connections that were significantly stronger in professional as compared to naïve drivers (we observed no stronger connections in this latter group).</p