Poster E128, Monday, March 26, 2:30-4:30 pm, Exhibit Hall C
Behavioral and ERP Correlates of Declined Sensorimotor Control of Speech Production With Ageing
Jingting Li1, Hanjun Liu1; 1The First Affiliated Hospital, Sun Yat-sen University
There is behavioral evidence showing that auditory feedback control of speech production can be modulated as a function of age, but the neural mechanisms underlying the ageing-related speech feedback control are poorly understood. In order to address this important question, we measured and compared vocal and event-related potential (ERP) responses to pitch perturbations of +200 and +500 tested produced by 22 young adults (10 male, aged 21-25 years) and 22 older adults (10 male, aged 60-72 years). Behavioral results showed that ageing adults produced significantly vocal compensations for pitch perturbations than young adults. At the cortical, the effect of age on N1 amplitudes did not reach significance. However, male young adults produced significantly larger N1 amplitudes than female young adults, while such gender effects were not observed in older adults. A significant interaction between age and gender was found in the amplitude of P2 response to pitch perturbations of +200 cents. P2 amplitudes became significantly larger with ageing in male adults only. P2 amplitudes also varied as a function of gender in young adults only, in which they were larger for males than for females. These findings provide neurobehavioral evidence for the effects of age on sensorimotor control of speech production, suggesting a decline in the ability of the audio-vocal system to inhibit compensatory vocal behavior to stabilize speech production. And gender-specific changes in speech motor control with aging highlight the importance of the interaction between age and gender in understanding the neural mechanisms underlying sensorimotor integration for speech production.
Topic Area: PERCEPTION & ACTION: Development & aging