Metrical temporal patterns used in the recognition task.

<p>Events are represented by crosses, beats are represented by short vertical lines, and strong beats are represented by long dashed vertical lines. Sequences were: strongly metrical acquisition (SM Acq), strongly metrical systematic (SMS), strongly metrical distracter (SMD), weakly metrical systematic (WMS), and weakly metrical distracter (WMD).</p

Parameter estimates for in Experiments 1 and 2.

<p>Probabilities range from 0 to 1. Parameters represent conscious processes (<i>c</i>; unfilled bars), unconscious processes (uc<i>-</i>; grey bars), and detection of the metrical strength (<i>m</i>; diagonally striped bars). Whiskers represent 95% confidence intervals (CI) estimated from 20,000 bootstrap samples. In Experiment 1, parameters <i>c</i> and <i>uc</i>- are considered different as the upper CI of parameter <i>c</i> (.29) does not overlap with the lower CI of parameter <i>uc</i>- (.30). In Experiment 2 parameters <i>c</i> and <i>uc</i>- are not considered different.</p

Frequency distribution of the raw IR (left panel) and DR (right panel) scores in the Ecstasy users during MDMA intoxication and placebo, and healthy controls.

<p>The straight line represents the mean IR (left) or DR (right) score in the healthy control group, the dotted lines represent the memory criterion, that is, 1.5 SDs of the healthy control group. Participants that fall on the left side of the left dotted line have impaired memory relative to the criterion; participants that fall on the right side of the right dotted line have superior memory performance relative to the criterion.</p

Drug use history (number of times used in lifetime) E-users.

<p>Drug use history (number of times used in lifetime) E-users.</p

The median (red line), 25th and 75th percentiles (box edges), range excluding outliers (whiskers), and outliers (red +) of the Total Immediate Recall (IR) Score (upper graph) and Delayed Recall (DR) Score (lower graph) of Controls, and Ecstasy users (E-Users) in the placebo condition and MDMA condition.

<p>The median (red line), 25th and 75th percentiles (box edges), range excluding outliers (whiskers), and outliers (red +) of the Total Immediate Recall (IR) Score (upper graph) and Delayed Recall (DR) Score (lower graph) of Controls, and Ecstasy users (E-Users) in the placebo condition and MDMA condition.</p

Mean and standard deviation of immediate recall (IR) and delayed recall (DR) in the word learning task for each study.

<p>Mean and standard deviation of immediate recall (IR) and delayed recall (DR) in the word learning task for each study.</p

Demographic details of Ecstasy users and matched controls.

<p>Demographic details of Ecstasy users and matched controls.</p