iv class="title">types.core.ImageMaskSeries</div>
      <div class="helptext"><pre><!--helptext -->  <span class="helptopic">ImageMaskSeries</span> An alpha mask that is applied to a presented visual stimulus. The data[] array contains an array of mask values that are applied to the displayed image. Mask values are stored as RGBA. Mask can vary with time. The timestamps array indicates the starting time of a mask, and that mask pattern continues until it's explicitly changed.</pre></div><!--after help -->
 