Dr. Ben Hanson, University College London (IMAGE) University College London Caption This is an image of Dr. Ben Hanson conducting study into the effect of mental challenge induced by movie clips on action potential duration in normal human subjects independent of heart rate Credit Dr. Ben Hanson via the paper Usage Restrictions Please credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.