Ambidexterity, or, Two-handedness and two-brainednessKegan Paul, Trench, Trübner & Company, 1905 - 258 páginas |
Términos y frases comunes
absolutely acquired action advantage Ambi Ambidextral Culture animals aorta Aphasia argument better bimanual training body cause cent cerebral cerebral hemisphere child conclusion concurrent cultivation dexterity dextral dextrous difference disease effect equally evidence exercise experience fact faculty favour fingers functions habit handedness hemisphere hereditary hides individual inferior innominate artery instinct James Sawyer James Shaw labour left brain left hand left side left-brainedness left-handed persons left-handedness less limbs lobe lung maker manual mechanical ment mental monkeys movements muscles muscular natural selection never object observations occupations one-handed one-handedness one-sidedness organic perfect position possession possible practice pre-eminence preferential prehension Professor prove pupils question reason reference remarks result right hand right occurred right side right-handedness simultaneous two-handed sinistral hand Sir Daniel Wilson sloping speech centre superiority symmetrical teachers teaching theory things tion two-handedness vertical writing viscera whilst writer's cramp writing and drawing
Pasajes populares
Página 91 - ... of races ; it is seen in the evolution of Society in respect alike of its political, its religious, and its economical organization ; and it is seen in the evolution of all those endless concrete and abstract products of human activity which constitute the environment of our daily life. From the remotest past which Science can fathom, up to the novelties of yesterday, that in which progress essentially consists, is the transformation of the homogeneous into the heterogeneous...
Página 90 - ... generations ? If such do occur, can we doubt (remembering that many more individuals are born than can possibly survive) that individuals having any advantage, however slight, over others, would have the best chance of surviving and of procreating their kind? On the other hand, we may feel sure that any variation in the least degree injurious would be rigidly destroyed. This preservation of favourable variations and the rejection of injurious variations, I call Natural Selection. Variations neither...
Página 91 - At the same time that Evolution is a change from the homogeneous to the heterogeneous, it is a change from the indefinite to the definite. Along with an advance from simplicity to complexity, there is an advance from confusion to order — from undetermined arrangement to determined arrangement.
Página 5 - The human hand is so beautifully formed, it has so fine a sensibility, that sensibility governs its motions so correctly, every effort of the will is answered so instantly, as if the hand itself were the seat of that will ; its actions are so powerful, so free, and yet so delicate...
Página 90 - Natural Selection acts exclusively by the preservation and accumulation of variations, which are beneficial under the organic and inorganic conditions to which each creature is exposed at all periods of life. The ultimate result is that each creature tends to become more and more improved in relation to its conditions. This improvement inevitably leads to the gradual advancement of the...
Página 5 - ... has so fine a sensibility, that sensibility governs its motions so correctly, every effort of the will is answered so instantly, as if the hand itself were the seat of that will ; its actions are so powerful, so free, and yet so delicate, that it seems to possess a quality instinct in itself, and there is no thought of its complexity as an instrument, or of the relations which make it subservient to the mind ; we use it as we draw our breath, unconsciously, and have lost all recollection of the...
Página 50 - The good old rule — the simple plan — that those may take who have the power, and those may keep who can...
Página 226 - ... concerned in its function some after-effect or, so to speak, memory of itself in them which renders its reproduction an easier matter, the more easy the more often it has been repeated, and makes it impossible to say that, however trivial, it shall not under some circumstances recur.
Página 14 - They were armed with bows, and could use both the right hand and the left in hurling stones and shooting arrows out of a bow, even of Saul's brethren of Benjamin.
Página 48 - Dr. Humphry accordingly inclines to the view that the superiority of the right hand is not natural, but acquired. "All men," he says, "are not right-handed ; some are left-handed ; some are ambidextrous ; and in all persons, I believe, the left hand may be trained to as great expertness and strength as the right. It is so in those who have been deprived of their right hand in early life ; and most persons can do certain things with the left hand better than with the right.