Speech training alters tone frequency tuning in rat primary auditory cortex
| Autor: | Crystal T. Engineer, Claudia A. Perez, Ryan S. Carraway, Kevin Q. Chang, Jarod L. Roland, Michael P. Kilgard |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Male
Consonant medicine.medical_specialty Speech perception education Audiology Auditory cortex Article Discrimination Learning Behavioral Neuroscience Tone (musical instrument) Speech discrimination Phonetics otorhinolaryngologic diseases medicine Animals Speech Discrimination learning Auditory Cortex Communication business.industry Rats Evoked Potentials Auditory Speech Perception Neurocomputational speech processing business Psychology |
| Zdroj: | Behavioural Brain Research. 258:166-178 |
| ISSN: | 0166-4328 |
| Popis: | Previous studies in both humans and animals have documented improved performance following discrimination training. This enhanced performance is often associated with cortical response changes. In this study, we tested the hypothesis that long-term speech training on multiple tasks can improve primary auditory cortex (A1) responses compared to rats trained on a single speech discrimination task or experimentally naïve rats. Specifically, we compared the percent of A1 responding to trained sounds, the responses to both trained and untrained sounds, receptive field properties of A1 neurons, and the neural discrimination of pairs of speech sounds in speech trained and naïve rats. Speech training led to accurate discrimination of consonant and vowel sounds, but did not enhance A1 response strength or the neural discrimination of these sounds. Speech training altered tone responses in rats trained on six speech discrimination tasks but not in rats trained on a single speech discrimination task. Extensive speech training resulted in broader frequency tuning, shorter onset latencies, a decreased driven response to tones, and caused a shift in the frequency map to favor tones in the range where speech sounds are the loudest. Both the number of trained tasks and the number of days of training strongly predict the percent of A1 responding to a low frequency tone. Rats trained on a single speech discrimination task performed less accurately than rats trained on multiple tasks and did not exhibit A1 response changes. Our results indicate that extensive speech training can reorganize the A1 frequency map, which may have downstream consequences on speech sound processing. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect