The Fluctuation of AttentionMacmillan Company, 1898 - 78 من الصفحات |
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accelerating effect adding the sheets alternating current amount appears areas asso association path automatic average brain cause centimetres centres change of feeling Clark University conscious constant contractions correspond curves decrease degree of fatigue direction of attention disc distinct distraction effort electric stimulus evidently exhaustion Experiment E Experiment G experimenter extraneous ideas fluctuation followed frequent Ganglion Cells greater groups ideational illustrates increased intensity interest kymograph later trials less letters longer ment mental activity mental function mental images mind mistakes motor muscle muscular fatigue naturally negative feeling nerve cells nerve-cell nervous normal nutritive object of attention October 18 period picture positive feeling Psychology psychoses record rection recuperation relations result retina scious screen seconds seems seen sensations sense organ adjustment sensory slip stimulation subjective conditions suppose syllables tape tendency time-measurements tion variety views visual ΙΟ
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الصفحة 2 - ... with which it is able to compel attention and dominate in consciousness. Let it once so dominate, let no other ideas succeed in displacing it, and whatever motor effects belong to it by nature will inevitably occui — its impulsion, in short, will be given to boot, and will manifest itself as a matter of course.
الصفحة 75 - Sherrington leads them to conclude that " the chemical products of cerebral metabolism contained in the lymph which bathes the walls of the arterioles of the brain can cause variations of the calibre of the cerebral vessels ; that in this reaction the brain possesses an intrinsic mechanism by which its vascular supply can be varied locally in correspondence with local variations of functional activity.
الصفحة 56 - We find them changed in those mental diseases the nature of which is made clear to us because the microscope can distinctly discover the cause for change, cell for cell and fibre for fibre ; and so we can show directly what result it has for the mental life when they are either too much or too many of them disorganized, or both.
الصفحة 72 - Each of the largest areas would have the only means for the outlet of its energy through the activity of the smallest that compose it. Wherever the tension of escaping energy would be greatest, there, for the moment, would be the seat of consciousness. The content of consciousness, whether my pen or a page number, would be determined by the locality of the activity ; and the order of these localities in their turn of discharge would be controlled partly by the association fibres, which, as they become...
الصفحة 53 - Not only do Feelings constitute the inferior tracts of consciousness, but Feelings are in all cases the materials out of which, in the superior tracts of consciousness, Intellect is evolved by structural combination.
الصفحة 74 - the chemical products of cerebral metabolism contained in the lymph which bathes the walls of the arterioles of the brain can cause variations of the calibre of the cerebral vessels . . .in this re-action the brain possesses an intrinsic mechanism by which its vascular supply can be varied locally in correspondence with local variations of functional activity'.
الصفحة 58 - There is no such thing as voluntary attention sustained for more than a few seconds at a time. What is called sustained voluntary attention is a repetition of successive efforts which bring back the topic to the mind.
الصفحة 4 - We need not look far to find a close analogy to these phenomena of intermittence in the fatigue and rest which we all undergo each day. At night the limbs feel heavy, a general uncomfortable feeling pervades the body, and the mind acts slowly and with frequent distractions. A good night's rest, however, seldom fails to relieve these symptoms of fatigue and brings with it the buoyancy and vigor always associated with morning hours. Another fact that indicates mental distraction to be a result of mental...
الصفحة 3 - Psychology, Vol. II., p. 559. necessarily portray a villain, or may it simply indicate the exaggerated intensity of a normal functioning ? These questions are all evidently included in the problem which it is the main object of this research to help solve, namely, What determines the time at which and time during which a given idea or set of ideas shall have a predominating influence upon the mind ; and what determines the intensity of that domination ? In short, what determines the direction and...
الصفحة 69 - ... seat of conscious mental activity and the areas that correspond to the simplest perceptive elements of objects. The finer lines that connect these represent association fibres ; j is the sensory tract and k the motor tract for a reflex movement. The association paths connecting the centres involved in this circuit are represented as being so enlarged as nearly to obliterate the existence of different cen as separate steps in the process. a previously untraversed portion of ground-substance —...