Limits...
Thai lexical tone perception in native speakers of Thai, English and Mandarin Chinese: an event-related potentials training study.

Kaan E, Barkley CM, Bao M, Wayland R - BMC Neurosci (2008)

Bottom Line: The MMN was followed by a late negativity, which became smaller with improved discrimination.In addition, native speakers of a non-tone language (English) were initially more sensitive to F0 onset differences (low-falling versus mid-level contrast), which was suppressed as a result of training.This result converges with results from previous behavioral studies and supports the view that attentive as well as non-attentive processing of F0 contrasts is affected by language background, but is malleable even in adult learners.

View Article: PubMed Central - HTML - PubMed

Affiliation: Linguistics, University of Florida, Box 115454, Gainesville, FL 32611, USA. kaan@ufl.edu

ABSTRACT

Background: Tone languages such as Thai and Mandarin Chinese use differences in fundamental frequency (F0, pitch) to distinguish lexical meaning. Previous behavioral studies have shown that native speakers of a non-tone language have difficulty discriminating among tone contrasts and are sensitive to different F0 dimensions than speakers of a tone language. The aim of the present ERP study was to investigate the effect of language background and training on the non-attentive processing of lexical tones. EEG was recorded from 12 adult native speakers of Mandarin Chinese, 12 native speakers of American English, and 11 Thai speakers while they were watching a movie and were presented with multiple tokens of low-falling, mid-level and high-rising Thai lexical tones. High-rising or low-falling tokens were presented as deviants among mid-level standard tokens, and vice versa. EEG data and data from a behavioral discrimination task were collected before and after a two-day perceptual categorization training task.

Results: Behavioral discrimination improved after training in both the Chinese and the English groups. Low-falling tone deviants versus standards elicited a mismatch negativity (MMN) in all language groups. Before, but not after training, the English speakers showed a larger MMN compared to the Chinese, even though English speakers performed worst in the behavioral tasks. The MMN was followed by a late negativity, which became smaller with improved discrimination. The High-rising deviants versus standards elicited a late negativity, which was left-lateralized only in the English and Chinese groups.

Conclusion: Results showed that native speakers of English, Chinese and Thai recruited largely similar mechanisms when non-attentively processing Thai lexical tones. However, native Thai speakers differed from the Chinese and English speakers with respect to the processing of late F0 contour differences (high-rising versus mid-level tones). In addition, native speakers of a non-tone language (English) were initially more sensitive to F0 onset differences (low-falling versus mid-level contrast), which was suppressed as a result of training. This result converges with results from previous behavioral studies and supports the view that attentive as well as non-attentive processing of F0 contrasts is affected by language background, but is malleable even in adult learners.

Show MeSH

Related in: MedlinePlus

Isovoltage maps to Low-falling deviants minus standards: 350–500 ms. Isovoltage maps for the 350–500 ms window for the low-falling deviants minus standards.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC2483720&req=5

Figure 4: Isovoltage maps to Low-falling deviants minus standards: 350–500 ms. Isovoltage maps for the 350–500 ms window for the low-falling deviants minus standards.

Mentions: A late negativity was seen for the deviant versus standard in the 350–500 ms window [Midline: F(1,32) = 7.29, p = 0.011; Lateral electrodes: F(1,32) = 6.75, p = 0.014] (see Figure 4.) The negativity was larger over the left hemisphere [F(1,32) = 9.18, p = 0.005], especially before training [CONDITION by TEST TIME by HEMISPHERE: F(1,32) = 6.95, p = 0.013; Pre-training: CONDITION by HEMISPHERE: F(1,32) = 13.94, p = 0.001; CONDITION: Left hemisphere: F(1,32) = 7.76, p = 0.009; Right hemisphere: F(1,32) = 1.32, p = 0.26; Post-training: no effects]. The degree of learning affected the change in the late negativity in the 350–500 ms interval: the larger the increase in d' scores from pre- to post-training, the smaller the late negativity in the 350–500 ms interval post- versus pre-training [Pearson's ρ = 3.68, p = 0.029].


Thai lexical tone perception in native speakers of Thai, English and Mandarin Chinese: an event-related potentials training study.

Kaan E, Barkley CM, Bao M, Wayland R - BMC Neurosci (2008)

Isovoltage maps to Low-falling deviants minus standards: 350–500 ms. Isovoltage maps for the 350–500 ms window for the low-falling deviants minus standards.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2483720&req=5

Figure 4: Isovoltage maps to Low-falling deviants minus standards: 350–500 ms. Isovoltage maps for the 350–500 ms window for the low-falling deviants minus standards.
Mentions: A late negativity was seen for the deviant versus standard in the 350–500 ms window [Midline: F(1,32) = 7.29, p = 0.011; Lateral electrodes: F(1,32) = 6.75, p = 0.014] (see Figure 4.) The negativity was larger over the left hemisphere [F(1,32) = 9.18, p = 0.005], especially before training [CONDITION by TEST TIME by HEMISPHERE: F(1,32) = 6.95, p = 0.013; Pre-training: CONDITION by HEMISPHERE: F(1,32) = 13.94, p = 0.001; CONDITION: Left hemisphere: F(1,32) = 7.76, p = 0.009; Right hemisphere: F(1,32) = 1.32, p = 0.26; Post-training: no effects]. The degree of learning affected the change in the late negativity in the 350–500 ms interval: the larger the increase in d' scores from pre- to post-training, the smaller the late negativity in the 350–500 ms interval post- versus pre-training [Pearson's ρ = 3.68, p = 0.029].

Bottom Line: The MMN was followed by a late negativity, which became smaller with improved discrimination.In addition, native speakers of a non-tone language (English) were initially more sensitive to F0 onset differences (low-falling versus mid-level contrast), which was suppressed as a result of training.This result converges with results from previous behavioral studies and supports the view that attentive as well as non-attentive processing of F0 contrasts is affected by language background, but is malleable even in adult learners.

View Article: PubMed Central - HTML - PubMed

Affiliation: Linguistics, University of Florida, Box 115454, Gainesville, FL 32611, USA. kaan@ufl.edu

ABSTRACT

Background: Tone languages such as Thai and Mandarin Chinese use differences in fundamental frequency (F0, pitch) to distinguish lexical meaning. Previous behavioral studies have shown that native speakers of a non-tone language have difficulty discriminating among tone contrasts and are sensitive to different F0 dimensions than speakers of a tone language. The aim of the present ERP study was to investigate the effect of language background and training on the non-attentive processing of lexical tones. EEG was recorded from 12 adult native speakers of Mandarin Chinese, 12 native speakers of American English, and 11 Thai speakers while they were watching a movie and were presented with multiple tokens of low-falling, mid-level and high-rising Thai lexical tones. High-rising or low-falling tokens were presented as deviants among mid-level standard tokens, and vice versa. EEG data and data from a behavioral discrimination task were collected before and after a two-day perceptual categorization training task.

Results: Behavioral discrimination improved after training in both the Chinese and the English groups. Low-falling tone deviants versus standards elicited a mismatch negativity (MMN) in all language groups. Before, but not after training, the English speakers showed a larger MMN compared to the Chinese, even though English speakers performed worst in the behavioral tasks. The MMN was followed by a late negativity, which became smaller with improved discrimination. The High-rising deviants versus standards elicited a late negativity, which was left-lateralized only in the English and Chinese groups.

Conclusion: Results showed that native speakers of English, Chinese and Thai recruited largely similar mechanisms when non-attentively processing Thai lexical tones. However, native Thai speakers differed from the Chinese and English speakers with respect to the processing of late F0 contour differences (high-rising versus mid-level tones). In addition, native speakers of a non-tone language (English) were initially more sensitive to F0 onset differences (low-falling versus mid-level contrast), which was suppressed as a result of training. This result converges with results from previous behavioral studies and supports the view that attentive as well as non-attentive processing of F0 contrasts is affected by language background, but is malleable even in adult learners.

Show MeSH
Related in: MedlinePlus