Pulsatile movement of Hermissenda. From: The Biological Bulletin | Date: October 1, 1997| Author: Epstein, Herman T. | COPYRIGHT 1997 Marine Biological Laboratory. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

A sample of Hermissenda were partially conditioned in response to light and shaking to study their pulsatile movement. After three days of training, the animals placed in aerated natural seawater exhibited many periods of increase and decrease in length. Examination of the data revealed that 34.8% of the animals responded through extensions. Extensions were either followed by another extension, a contraction or by no change. These results supported previous studies on the presence of pulsatil...

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