A 3 mm flexible catheter containing 2 solid state pressure sensors 3 cm apart will be positioned transnasally at the beginning of the study, so that one sensor is located at the base of the tongue and the second sensor is at the top of the upper esophageal sphincter. This protocol will allow the measurement of pressures generated at the tongue base. The concurrent manometry will allow us to directly measure pharyngeal pressures during swallow. All swallows will be viewed in the lateral plane except the last three 3 ml swallows viewed in the A-P plane. Subjects will not be required to swallow volumes or viscosities that they cannot manage comfortably. All such difficulties will be recorded on the data sheets.