The Philosophical Review/Volume 1/Summary: Jastrow - Studies from the Laboratory of Experimental Psychology
1. The effect of fore -knowledge upon repetition-times. Conclusion reached was that, "as the range of possible words decreases in extent, as the, subject's expectation is more and more definite, the time needed to repeat the word becomes shorter." 2. A novel optical illusion. Investigation of the bands produced by moving a horizontal rod up or down before a rotating disk composed of two rectors differing in color and shade. 3. Accessory apparatus for accurate time-measurements. (a) For control of the chromoscope. (b) For timing the rotation of disks, (c) For a way of color-mixing. 4. The psycho-physic series and the time-sense. Experiment consisted in assigning time-intervals given on the metronome to different classes. Results grouped themselves approximately under the psycho-physic law. 5. The psycho-physic series and the motor sense. Movements of the forearm within the limits 5 to 190 millimeters were assigned to six classes. Results approximated an arithmetic rather than a geometric series. 6. The interference of mental processes — a preliminary survey. The problem is the power of carrying on two mental processes at once. Motor processes interfere with motor processes; and the time of performing certain mental processes (reading sentences, words, etc.) is increased by motor processes.