Bauhaus-Universität Weimar

Titel:
Experimental Psychology: A Manual of Laboratory Practice, Vol. II: Quantitative Experiments, part 2: Instructor's Manual
Person:
Titchener, Edward B.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit11940/232/
§15- The Intensive RL for Pressure 
55 
slow rates of rotation were forced upon E by the method : the spring employed was 
the weakest of the set, and any increase of rate beyond the limit quoted meant 
that the ^ series could not be paired by like ^ series.^—It must, of course, remain 
for the present an open question, how far the steady decrease of the RL with 
* practice ’ is an artifact of the method. The author can only say that the experi¬ 
ments were made with great care. (2) The disc was of cardboard, and was applied 
to the back of the hand (area described in vol. i., S. M., 54). No exploration was 
made for pressure spots : this was an oversight.—For evaluating the scale de¬ 
grees in mgr., it is a help to use a balance whose pan remains stationary during 
the weighing, so that E has merely to screw down S to the required reading.—E 
had intended to work with a series of discs, but the experiments reported took 
so long a time that the original plan could not be carried out. (3) ‘ Practice,’ as 
we shall see later (p. 307), is a slippery term. In the present case, it undoubtedly 
covers a change in standard of judgment. (4) We cannot compare our results 
directly with those of von Frey (Abh., 199) : method, place of stimulation, area of 
R, rate of drum, were all different. On the whole, the RL above quoted appear 
somewhat smaller than von Frey’s. It should be noted, however, that although 
von Frey’s method does not furnish him with MV his Table shows great varia¬ 
bility in successive determinations. Thus the same O, working under exactly the 
same experimental conditions, gives the following results in mgr. : 
Jan. 22, ’96. 
1500 
1000 
600 
Jan. 25, ’96. 
5°° 
410 
250. 
Questions.— (i) and (2) may be answered from the fore¬ 
going. (3) On pain, see, e.g., von Frey, Abh., 246 ff. ; S. Alrutz, 
Undersökningar öfver Smärtsinnet, Upsala, 1901 (gives bibli¬ 
ography) ; on warmth and cold, Goldscheider, Ges. Abb., i., 1898, 
107; Kiesow, P. S., xiv., 1898, 583; C. S. Sherrington, in 
Schaefer's Physiol., ii., 1900, 948. 
Essay Subjects.— (1) The results of experimentation upon 
the intensive cutaneous RL (pressure, warmth, cold, pain). 
(2) The theory of cutaneous stimulation (pressure, warmth, 
cold, pain). 
(1) See, e.g., Wundt, P. P., i., 1893, 382 ff. ; i., 1902, 532 ff. ; C. S. 
Sherrington, in Schaefer’s Physiol., ii., 920 ff. (2) See, e.g., von Frey 
and Kiesow, Z., xx., 1899, 126 ff. ; Sherrington, loc. city 
1The author may repeat, apropos of these references, that it is never his inten¬ 
tion to furnish a complete bibliography of the topics treated in the present work. 
He has chosen rather to send the student to sources (often to secondary sources) 
from which he may find his way for himself to tire earlier literature. [Reviewing 
vol. i. in Mind, N. S., x. 1901, 540, W. McDougall writes : “ In the section on
        

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