(7) If tastes and smells have not the attribute of extension, how do you account for their apparent spread in space? If sounds are not spatial, how is it that we can localise them?
(8) Is there such a thing as a purely visual rhythm? How would you approach the question experimentally?
(9) Perform Aristotle’s experiment, by crossing the second over the first finger of the right hand, and pressing on a marble placed under the crossed joints, (a) Is Aristotle’s statement correct? Write out your observations. (b) Is sight decisive? Helmholtz said, on the contrary: “We are continually controlling and correcting the notions of locality derived from the eye by the help of the sense of touch, and always accept the impressions on the latter sense as decisive.” (c) Can you work out the perception of a thing or object, somewhat as the book has worked out the perception of distance?
(10) Can you suggest methods for the determination of imaginal type?
(11) Close your eyes, (a) Let an experimenter draw a blunt-pointed pencil at an even rate along the inside of your arm from the shoulder to the tip of the middle finger. The point seems to travel more quickly at some places than at others: why? Draw a diagram of the arm, and mark the places of apparent slowing and quickening. (b) Tie two pencils together with a bit of rubber between, so that the points are 1-1/4 to 1-1/2 in. apart. Let an experimenter set the two points crosswise on the skin at the shoulder, and draw them with even speed and pressure along the inside of your arm to the finger-tips. The points seem to converge and diverge: why? Draw a diagram as before.
(12) If a rough thread is drawn by an experimenter between your forefinger and thumb, at first quickly and then slowly, it will seem shorter in the first experiment than in the second. Why?
J. M. Charcot, Clinical Lectures on Diseases of the Nervous System, iii., 1889, Lect. xiii.; W. James, Principles of Psychology, 1890, i., chs. xiii., xv.; ii., chs. xviii., xix., xx.; C. H. H. Parry, The Evolution of the Art of Music, 1896; article on Optical Illusions, in Dictionary of Philosophy and Psychology, ii., 1902; W. Wundt, Lectures on Human and Animal Psychology, 1896, Lect. xi.; Outlines of Psychology, 1907, §§ 9, 10, 11; M. R. Fernald, The Diagnosis of Mental Imagery, 1912; E. B. Titchener, Experimental Psychology, I., i. and ii., 1901 (experiments on perception); Text-book of Psychology, 1910, 303 ff.