語調次發反應  音感聽力篩檢

1. 語調次發反應 音感聽力篩檢 鄭富城 (Fuh-Cherng Jeng) Associate Professor Ohio University www.ohio.edu/people/jeng/ August 2, 2013

2. 語調音感的重要性 !

3. Electrophysiological measures inauditory research What can evoked-potential measures tell us? How can that information help the clinic? Why are normal-hearing infants used? evoked potential recording system listener acoustic stimulus + - time

4. Background語調次發反應 (Frequency Following Response, FFR) • Follows the periodicity (i.e., frequency content) of the stimulus. • Phase locked to the periodicity of the stimulus f0 and harmonics • Originates from the brainstem area Period = 0.02 sec Frequency = 1/0.02 sec = 500 Hz Moushegian et al., 1973

5. BackgroundRecent accomplishment • Pitch encoding at the human brainstem correlates with listeners’ linguistic experience. -Krishnan et al., 2005 • Musical training shapes brainstem encoding of linguistic pitch patterns. -Wong et al., 2007, Nature Neuroscience • Some Autism and SLI children show compromised pitch tracking accuracy. –Russo et al., 2008 • Pitch encoding at the brainstem is related with reading and speech-in-noise perception. –Hornickel et al., 2009

6. 語調次發反應 Stimulus Response Control Jeng et al., 2011

7. 美國國家科學院研究計劃 (2013 -2015)Dear baby, can you hear me?

8. 美國 國家科學院研究計劃 (2013 -2015) Education Science www.pittstate.edu

9. About Us • Dr. Jeng’s AEP lab • Dr. Jeng’s research

10. Ohio University • Located in Athens, Ohio • 8,000 miles (12,500 kilometers) from Taichung, Taiwan

11. Current Research • Questions • What are the characteristics of FFR to voice pitch in neonates (1-3 days old). • What are the contributions of our innate factors versus our language experiences on pitch processing at the human brainstem level • To answer these questions….

14. How we feel about Taiwan

15. Research in Taiwan • Now that we are here • Two teams • Team Taiwan and Team USA • One goal • Obtain FFR/MMN recordings from infants • One purpose • Assess the contributions of biological factors and language experience on pitch processing

16. Methods • Collection and analysis of recordings from 120 infants over a 24 month time period • These infants will be assessed within 1-3 days of birth • Potential follow up includes an additional session at 3 months and a final session at 6 months

17. Project 1: Neonates Goals and Hypotheses • Goals • Investigate the characteristics of FFR to voice pitch in neonates (1-3 days old). • Examine the relative contributions of the “biological capacity” versus “linguistic experience” influences on pitch processing at the human brainstem and cortical levels. • Hypotheses • Based on the “biological capacity” model, neonates will demonstrate accurate processing of voice pitch during the first few days after birth. • Based on the “linguistic experience” model, enhancement of the FFR to voice pitch will be expected as a result of exposure to a specific language environment.

18. Schedule • 18 days left in Taiwan • Familiarize team members in Taiwan with our equipment • Training team members in Taiwan to obtain FFR/MMN recordings from infants using our equipment • Have the trained team members begin data collection on infants and obtain quality recordings • Foster international relationships that will ensure a team approach • Remaining time will be spent • Continued collaboration and building of team chemistry • Data collection in the United States • Maintaining weekly contact to ensure both teams obtain high quality recordings to address the research questions • Data analysis

19. Questions?