This exploratory investigation concerned the effects of both auditory and visual context variations on the immediate recall of a series of digits presented on a computer screen (CRT). 5 intensities of background noise and 5 background hues were presented randomly to 110 undergraduate volunteers as they studied 25 numerals ranging from 1 to 5 at rates of change of either 1 or 3 sec. per numeral timed from the onset of the previous numeral. A 2 x 2 x 5 mixed split-plot factorial analysis of variance gave a significant difference in mean immediate-recall scores between rates of digit presentation with better recall associated with the 3-sec. rate. There was no significant main effect in recall scores for auditory vs color contexts, yet a post hoc analysis of variance for successive stages followed by Scheffe comparisons showed that across auditory intensities, Stages 3 and 4 and 5 (combined) had significantly higher immediate recall scores than Stages 1 and 2 (combined). This improvement across stages was not found under the visual (color) series. There was a three-way interaction for modality-contexts x rates x levels explained by the partitioning of stages which differed for auditory and for visual contexts. Results are discussed in terms of effects of modality.

Short-Term Memory Digit-Span Performances under Auditory and Visual Contexts as a Function of Rate of Digit Presentation:

Wickelgren's (1966) short-term memory paradigm was used to investigate distinctive features of consonants in noise; 18 English consonants paired with the vowel /a/ were presented to 3 normal listeners in a CV context. Ss were tested in a quiet sound field at most comfortable listening level in experimental conditions of (1) quiet, (2) speech and noise at 0, (3) --5, and (4) --10 db S/N. Errors in auditory perception were eliminated from the data analysis and only errors in short-term memory recall were used as input to INDSCAL analysis. Results revealed that few errors were made in the quiet condition, but that all the noise conditions had deleterious effects on features.

Distinctive features for short-term memory of consonants in noise.

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Distinctive features for short-term memory of consonants in noise.