This is an excellent presentation from the DRS conference in Seattle in 2013. It is lengthy but worth the time. Make sure to check out the Panel Discussion at the end for what I found to be some key points.
There are four presentations
- Penetration-Aspiration Scale by JoAnne Robbins, PhD
- Objective Measures of Timing and Displacement by Rebecca J. Leonard, PhD
- NIH Swallowing Safety Scale by Christy L. Ludlow, PhD
- The Modified Barium Swallow Impairment Profile by Bonnie Martin-Harris, PhD