A study of the recognition thresholds for nonsense syllables previously presented in lists containing from 2 to 15 syllables is reported. The threshold is found to increase in proportion to the logarithm of the number of alternatives (i.e. the length of the list from which a given test syllable is drawn). It is therefore concluded that recognition threshold is a function of the amount of information transmitted.
Summary
Rats previously conditioned to approach a local eue in order to find their food, adopt the same orientation from an other starting place. But if then they are given a choice between two paths of different lengths to reach the goal, very soon they choose the shorter one, even if it is necessary to go away from the local eue when doing so. The role played by distance and time of runs in such a choice is discussed.
Summary
In the response learning to a T-maze situation, it happens that some rats « learn » the incorrect response, when using the correction method. This is a study of two experimental conditions, supposed to influence the lateralization process and thus to improve or to impair the development of this behavior : the ability to retrace, and the standardization of the manipulation of rats by the experimenter. The last variable exerts much stronger effects than does the former.
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