WHERE AND HOW WE REMEMBER. 



619 



If, now, we take models of four brains, and on the first mark out 

 the location of the various areas connected with the various sensory- 

 organs as determined by the anatomical connection of the white nerve- 

 threads ; on the second mark out the location of the various areas which 

 physiologists have shown to govern various sensory organs ; on the 

 third mark out the various areas whose disease produces disturbance 

 of action in the various sensory organs, and loss of memories of per- 

 ceptions by those organs ; and on the fourth mark out the various areas 

 which wither after disease of the various sensory organs — we shall 

 find that upon all four brains the areas belonging to any one organ 

 coincide. We may therefore conclude that each class of sensations 



Fig. 2.— Outline of HtniAN Bbain, Sidk-Vikw. (After Ecker.) 



1. Area of sight and Its memories. 



2. Area of hearing and its memories. 



3. Area of motion and its memories, j ?J?Pff„<'^„®.*^!T!?J '!?!. 



4. Area of touch and its memories, 

 B Area of motor speech-memories. 

 The areas of motion and general sensation coincide to some extent. 



middle one third, arm. 

 lower one third, face. 



and each class of memories has its own definite area of the gray mat- 

 ter on the surface of the brain. Memories of objects seen are located 

 in the posterior part in the occipital region. Memories of sounds 

 heard are located in the lower lateral part in the temporal region. 

 Memories of motions in the limbs, and of touch in those limbs, are 

 located side by side in the central lateral region. Memories of speech 



