The Birmingham age-herald., 1911-04-16
ASTUDY IN THE DUALITY OF HEADS Difference in Sides Shown
 by Camera RULES TO BE DEDUCED Experiments Point to Psychological Achievements-A Fascinating Field For Photographic
 Research


 features. portrayed as a symmetrical whole, though made up In reality of two left sides or two right sides of the head, may prove the greatest achievement in the solution of the psychologists the sur geons' and the scientists problems of the qualities and tendencies of the human brain, is the latest possibility to be drawn from a series of these picture experiments that have Just been made.
 The art of making these photographs which may be called the photography of the dual physiognomy or even of the dual personality, also helps in making clear to the eye any dissymmetry in the develop ment of the body and the brain. or such a difference. it is believed, will be indubit- ably registered on the different aspects of the two "one side" pictures of a per son.
 Though most persons do not realize it, it is said there is always some difference in general appearance, if not in actual shape between the right side of the head and the left side Therefore is photo graph is made containing only the fea- lures of the right side of a persons head it will present many differences in charac- ter from photograph made up of the features of the left side.
 Two Hemispheres
 Why this is so is one of the evidences of that difference in the functions of the two hemispheres of the brain that ex- presses itself subtly in externals of even the best balanced heads. That such is the case may be readily seen from the joined pictures of faces so familiar as those of Governor Foss and Mayor Fitz- gerald. As two men who are known either by published photographs or by personal observation to people all over New Eng land, their photographs treated in this manner offer good evidence of the dis tinction. To some persons, for example, Mayor Fitzgerald might be identified more readily by the right side pictures, while 10 others his left side" would seem more familiar. It would be the same in the joined photographs of Governor Foss That both of these men have well bal anced heads-that, indeed, they are strik- ing types-makes the difference in their joined pictures and the originals all tho more impressive.
 As to the method of making such pie lures the process Is of interest to anna teur photographers who may wish to un- derstand just how the trick is done, for 1t offers a chance for most fascinating ex- | periments.
 Taking the Photographs 1 Thus fracture of the skull on the right side would result in paralysis of some part of the left side of the body. Whether in such an event it would be the left leg. the left arm. the left hand aor the entire left portion of the body would depend on just what part of the right side of the skull was injured.
 l So well is this established that the area of such fractures with the particular sec- ton of the body affected by fractures within each area have been mapped out correctly on the human skull as the re- suit of thousands of experiments made on the brains of monkeys.
 Aid to Psychologists l With such questions as these arising from the difference in outside influences upon the two halves of the brain, there is every reason to expect that joined pho tographs of heads showing the distinction between the left features and the right features will prove of assistance
 In studying such photographs, scientists have already noticed that the left side l photograph of a right-handed person us- ually shows more development than, the 1 N~tO | right side photograph.
 | This is explained on the ground that the | right-handed persons. having the impor- tant functions of the right hand controlled | by the left side of his brain has a greater. development of that left brain lobe. In the case of the left-handed person the | cranial difference is reversed How often | this is so, however cannot as yet be es- tablished since the licturing of dual per I ,a1t Il, facial and cranial contour made into a complete face. is as yet just begun, al- | though psychologists are already com mencing preparations for large collections of such pictures from which rules may | be deduced
 | The first step is to take a full face pho- tcgraph of the person whose features are | to be sexperimented upon. The primary requisite is that the picture be exactly l full face and then from the film to make two copies, one in the ordinary way and the other inverted. If the negative is taken on thin film the inverted prin. may be easily made by printing with the film side outward.
 Each of the two copies is then cut in half. and the accuracy of this Is deter mined by drawing a line between the pupils of the eyes and making the per- pendicular cut through the face at right angles to the middle of this line With both prints thus cut in half the right half of the true copy is joined to the left half of the inverted copy. and so the full face is made, although 1t contains only the features of the right side of the sitters s face.
 In the same way the left-featured lace is obtained. Then, placing the right featured portrait and the left-featured portrait beside the original picture. the duality of personality hidden from the hu- man eye is made clear by the unrelenting vision of the camera.
 What such photographs contain is as yet only partly grasped. though the prog ress of brain surgery, of psychology and of experimental physiology already opens up wide uses for these prints by the stu dent of the near future.
 As fundamental fact, for example, it is known that while the normal brain is symmetrical in it's general structure it's two halves are set apart in the adult in- dividual for entirely different functions Strangely enough, at first glance the left side of the brain controls the right side of the body, while the right side of the brain controls the left side of the body.
 A Hard Task
 The office manager turned to the new boy.
 'iIJere Georgev he said .e6 into +he