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Titre : A course in experimental psychology. Part 1 / by Edmund C. Sanford,...
Auteur : Sanford, Edmund Clark. Auteur du texte
Éditeur : D. C. Heath (Boston)
Date d'édition : 1897-1898
Sujet : Sens et sensations
Notice d'ensemble : http://catalogue.bnf.fr/ark:/12148/cb372735278
Type : monographie imprimée
Langue : anglais
Format : 2 vol. (IV-183, VIII-p. 184-449) : ill. ; in-8
Format : Nombre total de vues : 280
Description : Collection numérique : Originaux conservés à la Bibliothèque H. Ey (C. H. Sainte-Anne, Paris)
Description : Contient une table des matières
Droits : Consultable en ligne
Droits : Public domain
Identifiant : ark:/12148/bpt6k77076b
Source : Bibliothèque H. Ey. C.H. de Sainte-Anne, 720-98
Conservation numérique : Bibliothèque nationale de France
Date de mise en ligne : 15/10/2007
Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour ce document est de 0%.
or left, and then try to point to some detennined object. An error like that in a will be observed. Turning of the eyes upward or downward lias a doubtfui resuit. Instead of closing thé eyes, they may be kept open if an opaque acreen is held close before thé face. Repeat &, voluntarily turning the eyes a~ far a~ possible in thé direction opposite to that of the turuing of thé head. Ttie original error will probably disappear, or be found to have cha.nged its sign. For this illusion another eye explana-tion is suggested by Breuer, namely, that in such extreme turnmgs of thé eyes, their sbctua-1 position does not correspond with thé intended position but cornes short of it. We infer the direction~ however, from the intended position, and thus into thé error in pointing. For the illusion in other positions of the head and even for this, his own preferred expla.nation is again diSerent, and is partiy based on thé foUowing experiment.
Close the eyes, and touch tlie tip of thé nose or the forehead with a pin or a pencil while thé Itead is in thé usual position, and after a little try to touch thé saine spot again. Thé error, if any, will be very small. Repeat thé touch in the normal position, and then turn tlie liea3. to the right or left or incline it toward thé shoulder or forward or backward. After holding it in the chosen position for hait a minute, attempt to touch the spot again. Gross errors will resuit till corrected by practice. Thé error is one of underestimation, and should by itself alone produce a resuit directiy thé reverse of that found by Delage. Breuer, l)owever, introduces another factor. His explanation for thé inclined positions of thé head is soinewhat as follows by means of the otolith-apparatus of the ear, we get a true perception of the amount of inclination of thé head, at thé same finie that we get thé erroneous perception just mentioned. Thé only way in which we can harmonize thé