The displacement pattern on the chest wall due to cardiac activity has been mapped by a noninvasive and noncontact technique using a laser speckle interferometric method. A matrix of 30 multiplied by 40 elements is constructed by analyzing the time-averaged specklegram, recorded in the image plane and then transformed into a 3-D plot. Plots of normal subjects obtained by the above method during QRS complex and T-wave of the ECG and during the occurrence of the II heart sound are significantly different from each other. Similar mappings done for cardiac patients provide information on the abnormalities involved in the cardiac function.