Symmetry as a grouping cue for numerosity perception

<p>For the numerosity experiments: each file contains a matrix called &ldquo;a&rdquo;. Each row of the matrix &ldquo;a&rdquo; is a trial.&nbsp;</p> <p>The columns contain the following information:</p> <ul> <li>1st: Numerosity of test stimulus</li> <li>2nd: Log10 of numerosity of test stimulus divided by the standard numerosity</li> <li>3rd: Participant response (0 = standard stimulus; 1 = test stimulus)</li> <li>4th: 200</li> <li>5th: Standard numerosity &nbsp; &nbsp; &nbsp;</li> <li>6th: Dots size in pixels</li> <li>7th: 10</li> <li>8th: Condition (0= symmetry condition; 1= random condition)</li> <li>9th: Standard-Test order (1 = standard first; 2 = standard second)</li> <li>10th: Response time</li> </ul> <p>For the control experiment: each file contains a matrix called &ldquo;a&rdquo;. Each row of the matrix &ldquo;a&rdquo; is a trial.&nbsp;</p> <p>The columns contain the following information:</p> <ul> <li>1st: Numerosity of test stimulus</li> <li>2nd: Log10 of numerosity of test stimulus divided by the standard numerosity</li> <li>3rd: Participant response (0 = standard stimulus; 1 = test stimulus)</li> <li>4th: 200</li> <li>5th: Standard numerosity &nbsp; &nbsp; &nbsp;</li> <li>6th: Dots size in pixels</li> <li>7th: 10</li> <li>8th: 0= standard stimulus symmetric and test stimulus random</li> <li>9th: Standard-Test order (1 = standard first; 2 = standard second)</li> <li>10th: Response time</li> </ul>