There is a detailed article by Eleonora J. Beier, Suphasiree
Chantavarin, and Fernanda Ferreira at Psychology and Aging on March 27, 2026 (pages
203 to 218) titled Do Disfluencies Increase With Age? Evidence From a
Sequential Corpus Study of Disfluencies. In their fifth paragraph they explain
what they focused on:
“Disfluencies have been identified at different levels of
production, such as prosodic (e.g., improper stress), lexical (e.g.,
repetitions), and syntactic (e.g., phrase revisions). Other types of
disfluencies include filled pauses (e.g., um, uh), lexical fillers (e.g., well, you
know), and silent pauses. In addition, fluency can be assessed by
measuring a person’s speech rate, or the speed with which they talk. In this
study, we focus on filled pauses (um, uh), repeats (e.g., went to the the store), and repairs
(e.g., I think- I believe that …), as well
as speech rate.”
The abstract says:
“Speech disfluencies such as repeated words and pauses
provide information about the cognitive systems underlying speech production.
Understanding whether older age leads to changes in speech fluency can
therefore help characterize the robustness of these systems over the life span.
Older adults have been assumed to be more disfluent, but current evidence is
minimal and contradictory. Particularly noteworthy is the lack of longitudinal
data that would help establish whether a given individual’s disfluency rates
change over time. This study examines changes in disfluency rates through a
sequential design with a longitudinal component, involving the analysis of 325
recorded interviews conducted with 91 individuals at several points in their
lives, spanning the ages of 20–94 years. We analyzed the speech of these
individuals to assess the extent to which they became more disfluent in later
interviews. We found that, with older age, individuals spoke more slowly and
repeated more words. However, older age was not associated with other types of
disfluencies such as filled pauses (uh’s and um’s) and repairs.
Overall, this study provides evidence that, although age
itself is not a strong predictor of disfluencies, age leads to changes in other
speech characteristics among some individuals (i.e., speech rate and indicators
of lexical and syntactic complexity), and those changes in turn predict the
production of disfluencies over the life span. These findings help resolve
previous inconsistencies in this literature and set the stage for future
experimental work on the cognitive mechanisms underlying changes in speech
production in healthy aging.”
And their conclusions are:
“We have presented results from a corpus study of
conversational speech to quantify age-related changes in speech fluency
sequentially rather than cross-sectionally. We found that older adults spoke
more slowly, consistent with previous reports (Castro & James 2014; Gordon
et al., 2019; Horton et al., 2010)
and we observed that they produced more repeated words. At
the same time, older adults did not produce more repairs or filled pauses, nor
was there an effect of age on all three types of disfluencies combined.
Our results show that whether a relationship between age and
disfluency is observed depends on the type of disfluency measured, which in
turn helps explain previous inconsistent findings. Overall, we suggest that
while age is not a strong predictor of fluency measures other than speech rate,
there are large individual differences in how other speech characteristics
change with age, even in relatively high-functioning older adults, reflecting
the trade-off between slower processing speed (Salthouse, 1996; Salthouse &
Meinz, 1995) and accumulated vocabulary and language experience (Ramscar et
al., 2014). Thus, some individuals slow down their speech as they age—a change
associated with higher lexical diversity and the use of less frequent words but
also more filled pauses—whereas others do not.
Our findings challenge the prevalent assumption that older
age leads to more disfluent speech by showing that other changes in speech
production (i.e., overall speech rate, word frequency, lexical diversity, and
sentence length) are better predictors of disfluencies than age.”
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