One possible explanation for this result is that the presence of articulatory suppression
made it more difficult to use the phonological loop, and thereby, the memorizing task became more dependent on the visual memory.
As a form to prevent the rehearsal of the stimuli in verbal terms, the participants performed an articulatory suppression
task, repeating a sequence of numbers ("1,2, 3,4" or "2,3,4, 5").
The procedure was the same as in the previous experiments, with articulatory suppression
as secondary task.
Then, the five task conditions (single-task, articulatory suppression
, matrix-tapping, random-interval generation and fixed-interval generation) followed in one of five random orders based on a randomized Latin square.
The findings are entirely consistent with earlier studies that demonstrate a disruption of performance on conditional reasoning tasks in the presence of an executiv e load, but not in the presence of articulatory suppression
or tapping (Toms et al.
It is also predicted that articulatory suppression
will disrupt recall.
This experiment also revealed a significant effect of steady-state articulatory suppression
This pattern is similar to what is seen in normals tested under conditions of articulatory suppression
In addition, articulatory suppression
abolished the language difference in memory span: a finding that further supported the view that the bilingual digit span effect occurs as a result of language differences in speech rate.
The data from Finnish and Swedish digit span tasks under articulatory suppression
(Table 2) were subjected to a three-way analysis of variance, in which mother tongue and language of schooling were between-subjects factors and language (Finnish or Swedish) was a within-subjects factor.
Each of the Brooks tasks was performed on its own and with each of three concurrent tasks, articulatory suppression
, spatial suppression and random generation.
Barron & Baron (1977) studied the effect of articulatory suppression
on rhyme judgements in children aged from 6 to 13.