Abstract
Cortical auditory evoked potentials (CAEP) throughout a language task is beneficial during psychophysiological evaluation to advance identification of language disorders. So as to better comprehend human communication and to provide additional elements for neuropsychological examinations we aimed to (1) examine the influence of language tasks on cortical auditory processing and vagal control of heart rate and (2) to verify a possible association between the parasympathetic cardiac regulation and cortical auditory processing in language tasks. This study was completed with 49 women. The subjects were separated into two groups: (1) phonological language tasks (N = 21) and (2) semantic (N = 21) language tasks. Heart rate variability (HRV) and CAEP were evaluated before and after the tests. HRV reduced (small effect size) and P3 wave latency increased after the phonological task. Identical variables were significantly correlated after the phonological task and linear regression indicated significant interaction between pNN50 (percentage of adjacent RR intervals with a difference of duration greater than 50 milliseconds) and P3 latency (16.9%). In conclusion, phonological language tasks slightly reduced parasympathetic control of HR and increased cognitive effort. The association between HRV and CAEP are anticipated to be involved in this mechanism.
Highlights
Cortical auditory evoked potentials (CAEP) throughout a language task is beneficial during psychophysiological evaluation to advance identification of language disorders
When comparing CAEP components before and directly after the phonological tasks, we found a significant increase in latency of P3 wave, while no significant differences were achieved for N1, P2 and N2 amplitude and latencies (Fig. 1)
We revealed no significant association between Heart rate variability (HRV) and CAEP
Summary
Cortical auditory evoked potentials (CAEP) throughout a language task is beneficial during psychophysiological evaluation to advance identification of language disorders. Social communication can be expressed through social engagement modulated by the autonomic nervous system only when the defensive circuits of fight, flight or freeze behaviors are inhibited[2] This control mechanism is detected in auditory tests, when the individual must be actively engaged during the tasks for detecting target sounds[3,4]. Since 1996, several studies have applied HR variability (HRV) as a well-recognized technique to non-invasively evaluate autonomic HR regulation[7] It is unclear if HRV and cortical auditory processing respond to identical stimulus at comparable intensities. In this way, auditory information processing is an essential parameter for social function examination. Language tasks involve the involvement of frontal and temporal cortical areas, which are appropriate for the cognitive domains mentioned directly above[8]
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