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The article examines the right ear advantage in the processing of speech signals by right-handed people. Speech delivered to the left ear is transmitted to the right hemisphere by the contralateral path and has then to be relayed to the left hemisphere via the corpus callosum before undergoing the processing for which this hemisphere is specialized. Measurements of choice reaction time to a range of speech stimuli presented binaurally indicated that considerable variation in mean reaction time is to be expected even in conditions where the task requires the subject to perform only the first level of acoustic-phonemic decoding.

In previous studies of the acoustic cues that may be used in the identification of English consonants, it has been found that, at least for certain classes of consonant, there is a strong tendency for listeners to hear speech sounds in a categorical fashion. The measures of discrimination showed that subjects were in fact more sensitive to change in the region of the phoneme boundary than at other points in the continuum of change. Researchers are concerned here only with groups of sounds in which change with respect to a single acoustic dimension is a sufficient cue for phonemic differences.

The article studies the effect of delayed visual control on writing, drawing and tracing. The first experiments employing delayed sensory feedback were performed in the acoustic field. Delay in acoustic feedback also affects non-vocal activities. The experiments consisted of replaying speech of a person recorded after a variable delay. For the experiments, Bell Telephone Laboratories employed an apparatus, which consisted of a telewriter, which would produce a delayed trace on a Hughes memoscope, which was watched by the writing subject. A panel of judges would observe the images of the resulting oscillograms for their neatness.

This article presents an analysis of the phonemic substitutions occurring in the speech of an aphasic patient. It has been held by various writers on the subject of aphasia that changes in the speech of an adult aphasic bear some relation to the developments in the speech of a child when he is learning to talk. Other authors, including doctor Macdonald Critchley have held this theory to be unsound for a variety of reasons. An analysis of a patient's speech was done and the result contradict the idea that the degeneration of speech in aphasia mirrors its development in childhood.

The article presents a study designed to measure the effect on stress judgments of changes in three of these physical dimensions, duration, intensity and fundamental frequency. The experimental method was to synthesize speech stimuli in which these quantities could be controlled and varied over a considerable range and to use this material to construct listening tests which were carried out by large groups of subjects. The results showed that both duration and intensity act as cues in stress judgments. Among the physical dimension, duration produced the greater overall fluctuation in the judgments.

The article offers a theoretical treatment of the main problems that arise in mechanical speech recognition. The proposed treatment approach presented was based on the conclusions reached in experiments on the perception and recognition of speech sounds and on experimental results already obtained with a mechanical recognizer. In the first part, the problems of primary or acoustic recognition are addressed, including the gating problem, the choice of recognition units, and the acoustic recognition of different classes of speech sound, such as vowels, plosive consonants, fricative consonants and periodic continuants. The second part discusses the use of language statistics in mechanical recognition.