Acquisition of the feature [+spread glottis] in Icelandic.

The feature [+spread glottis] ([+s.g.]) denotes that a speech sound is produced with a wide glottal aperture with audible voiceless airflow.

Fricative acquisition in English- and Icelandic-speaking preschoolers with protracted phonological development.

Few studies have directly compared fricative development across languages. The current study examined voiceless fricative production in Icelandic- versus English-speaking preschoolers with protracted phonological development (PPD). Expected were: a low fricative match (with age effect), highest match levels for /f/ and non-word-initial fricatives, developmentally early mismatch (error) patterns including deletion, multiple feature category mismatches or stops, and developmentally later patterns affecting only one feature category.