. Elementary biology; an introduction to the science of life. Biology. MAN'S BRAIN 499 515. Tools and weapons. The natives of Madagascar say that if a spear is thrown at a lemur, the animal will catch it and throw it back with deadly precision. Monkeys will crack nuts by pounding them against some hard object, and gorillas. Fig. 260. Localization of functions in the cerebrum By studying human beings and other animals in which the brain had been injured, and by making experiments, it has been ascertained that certain regions of the brain cortex are related to receiving sensations from specific
. Elementary biology; an introduction to the science of life. Biology. MAN'S BRAIN 499 515. Tools and weapons. The natives of Madagascar say that if a spear is thrown at a lemur, the animal will catch it and throw it back with deadly precision. Monkeys will crack nuts by pounding them against some hard object, and gorillas. Fig. 260. Localization of functions in the cerebrum By studying human beings and other animals in which the brain had been injured, and by making experiments, it has been ascertained that certain regions of the brain cortex are related to receiving sensations from specific regions of the body, while other regions initiate movements of specific muscles. Most of the sensory and motor nerves pass through the spinal cord, SC. The thinking is carried on by the so-called association areas, A-i and .-1-3. The frontal association area has to do with abstract thinking, self- control, concentration, and making decisions. The hind association area has to do with knowing and understanding concrete facts and relations will fight with a stick used as a club. But probably no gorilla or monkey ever carried a club or a stone about with him for use in possible emergencies, and that is something that man has done. Even among the earliest remains of human activity there are indications that man chipped stones to fit his hand, to be used as weapons or perhaps for breaking shellfish (Fig. 261).. 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. Boston New York [etc. ] Ginn and company
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