Frequencies in Perception and Production Differentially Affect Child Speech.

Area of Science:

• Child language acquisition
• Speech perception and production

Background:

• Frequent sounds and words are typically acquired earlier and produced more accurately by children.
• Recent research indicates frequency is not universally facilitative in language acquisition.
• Interactions between perceptual input frequency and production practice frequency can inhibit learning.

Purpose of the Study:

• To investigate how varying input frequencies impact children's production accuracy.
• To examine the effect of input frequencies on referent identification.
• To understand the interplay between input frequency and production practice in word learning.

Main Methods:

• A novel word-learning task was administered to 33 typically developing 3- and 4-year-olds.
• Nonwords were presented with varying input frequencies (1, 3, 6, 10 times) and talker variability (single vs. multiple).
• Production accuracy and referent identification were assessed immediately after initial learning and in a delayed posttest.

Main Results:

• An input frequency of 3 optimally facilitated production accuracy during the initial test phase.
• The facilitative effect of input frequency diminished by the posttest, indicating an interaction with production practice.
• Talker variability did not significantly influence accuracy, and referent identification did not show clear dependence on input frequency or talker variability.

Conclusions:

• Input frequency can facilitate word learning, but its benefits are constrained by interactions with production practice.
• The principle of 'more input is not always better' was supported, highlighting complex learning dynamics.
• Further research into these interactions could inform therapeutic strategies for optimizing frequency-based interventions in speech and language therapy.