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In multiple-U mazes white rats were found to run the true path more easily when the blinds were located always on the same constant side (C) than when they were located alternately right and left (A). This phenomenon was examined by variations of mazes in several series of experiments. When...
Small fish will pass quite readily from one vessel to another if these are joined by a suitable waterway. The bridges described in this article are in the form of siphons made of glass tube, with one inch inside diameter. The total length of the tube is twenty inches. The central portion for a...
Baby chicks, young albino rats, adult tame canaries, wild gray field mice and wild sparrows were placed in a cage one at a time with a hungry five-foot chicken snake, for which they constituted natural food objects. Observations covering a period of several months indicate that fear activity...
Specifications for simple arrangement of transformer, resistance, rectifier, and milliammeter for administering predetermined amounts of A. C. to rats and other small animals, independent of the resistance of the animal.
In a modification of the Yerkes-Watson apparatus, chickens demonstrated the ability to discriminate with a high degree of accuracy between circles and triangles and triangles and squares of equal area and brightness. One animal discriminated between a circle and a square. When black forms...
The purpose of the experiment is to ascertain the degree to which individual differences in maze performance of rats are determined by each of the four factors: age, weight, sex and pigmentation. If such factors play a significant rôle as differentiae, they are "irrelevant" sources of...
In the rat it was demonstrated that action currents appear in all cortical fields studied (motor, common sensory, visual, and auditory) as a direct result of both ipsilateral and contralateral Achilles reflex stimulation. The mean latency of such action current appearances (time elapsing between...
The purpose of this paper is to investigate the problem whether individual differences among rats in the learning of one maze are correlated with the learning of another. Certain quantitative requirements of such an investigation as this on the community of function between abilities are...
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