Speeded detection of vowels: a cross-linguistic study

Area of Science:

• Psycholinguistics
• Speech Perception
• Phonetics

Background:

• Understanding how listeners process spoken language is crucial for fields like linguistics and cognitive science.
• Vowel perception is complex due to significant variability in natural speech.

Purpose of the Study:

• To investigate listeners' response times and accuracy in detecting vowel targets within spoken words and nonwords.
• To examine the influence of syllable position, vowel duration, and vowel set distinctiveness on speech perception.
• To compare vowel detection patterns in English and Spanish to assess cross-linguistic effects.

Main Methods:

• Four experiments were conducted measuring listeners' response times to detect vowel targets.
• Experiments involved real words and nonwords in English, with varying vowel sets.
• A fourth experiment was conducted in Spanish to replicate findings.

Main Results:

• Detection accuracy was generally low.
• Targets in initial syllables were detected more slowly than those in final syllables.
• Response time and missed-response rate were inversely correlated with vowel duration in English.
• Vowel set distinctiveness had minimal impact on response patterns.
• Spanish experiment replicated English findings, except miss rate was unrelated to vowel duration.

Conclusions:

• Listeners exhibit cautious response patterns when detecting vowel targets in natural speech.
• These patterns reflect an adaptation to the inherent variability of vowels in spoken language.
• Findings suggest robust mechanisms for processing speech despite acoustic variations.