Saito (1993b, Expt 2) investigated the effects of memory updating, a method used by Morris & Jones (1990), on the phonological similarity effect.
The phonological similarity effect appeared in the control condition.
and that is enough to ensure that the phonological loop is pre-empted to the extent that the phonological similarity effect disappears.
On the other hand, repeated production of a single vowel 'ah' is sufficient to abolish the phonological similarity effect (Expts 1 and 2), and Murray (1968) showed a similar effect with a single syllable 'the'.
Bishop & Robson (1989) observed the phonological similarity effect and the word-length effect in children with no articulate speech from birth and it is difficult to accept that such children have developed an adequate speech motor programme without ever having produced overt speech.
Influence of articulatory suppression and memory updating on phonological similarity effect.
The phonological similarity effects for visually presented materials were tested in three conditions (silent control, intermittent suppression and continuous suppression).
As is evident from the figure, clear phonological similarity effects were obtained in both the control condition and the continuous suppression condition but not in the intermittent condition.