. Biology and man. Biology; Human beings. Motor impulse from here. Sensation received here Vif automatic, as is much of the activity of other species. But while reflexes are in- separable from human conduct, they are not the distinctive characteristic of our behavior. For each reflex is a segment, or fraction, which we are able to study by itself. What we learn from these frag- ments does not necessarily tell us that the organism always acts as a whole. Or that the activity of the organism is always in relation to a complex situation, not merely a simple response to a single stimulus. There ar
. Biology and man. Biology; Human beings. Motor impulse from here. Sensation received here Vif automatic, as is much of the activity of other species. But while reflexes are in- separable from human conduct, they are not the distinctive characteristic of our behavior. For each reflex is a segment, or fraction, which we are able to study by itself. What we learn from these frag- ments does not necessarily tell us that the organism always acts as a whole. Or that the activity of the organism is always in relation to a complex situation, not merely a simple response to a single stimulus. There are mechanical elements in hu- man action, but life is more than the sum of these elements. Beyond these reflexes, there are high degrees of intelligence, high skills in adjustment, high levels of imagination, initiative and ingenuity. It is these that distinguish the animal with the modern brain from all other species. Efierent nerve — \fferent -nerve How Do Nerves Receive Different Kinds of Stimuli? General Sensitiveness and Special Sen- sitiveness^ The naked protoplasm of various small plants and of the ameba and other protozoa seems to be equally sensitive to many different kinds of stimuli or disturbances. The protoplasm reacts to mechanical pressure or direct Stimulus here BEHAVIOR LIMITED BY NERVE CONNECTIONS If the afferent nerve of the arm or leg is cut, one might move the limb freely, but could not feel any stimuli that it might receive from the outside. He could walk so long as the efFerent nerves were intact. If the efferent nerve were cut, he could feel pain or tickling in his hands or feet, but could not move a limb ^See Nos. 6, 7, and 8, pp. 299 and 300. 284. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred)
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