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DiskusiWith the present study, our main objectives were: (a) determining which VEP response components were present in 1 month old infants when presenting them 2 visual un patterned flash stimuliintensities; (b) verifying if there were differences regarding the visual stimuli processing in the infants who were sleeping and awake during the stimuli presentation; and (c) understanding if the VEP components could predict an adjusted orientation and or regulation behavior in one month old infants . We found that in both sleeping and awake one month old infants, P2 and N3 components were present during the flashlight stimuli, in both lower and higher intensities. Indeed, the presenceof these components was a consistent and robust finding observed among all infants. These results are consistent with previous findings (McGlone et al., 2013) suggesting that visual components suchas P2 or N3 may reflect a mature brain development in the first weeks of life.Considering the flash stimuli intensities, our results revealed that the infants displayed greater P2 amplitude in response tothe higher intensity stimulus. This was evident only when theinfants were awoken. Therefore, these results suggest that theinfant’s state is crucial for determining different visual processing thresholds. In fact, as it has been reported before (Shepherdet al., 1999), infants’ state seem to influence the VEP peaks latencyand amplitude regarding the flash visual response, once infants that are awake were reported to display greater amplitudes and shorter peak latencies (Benavente et al., 2005). The present studydid not corroborate previous evidence suggesting that there areno differences regarding the VEP characterization in sleeping and awake infants (Barnet et al., 1980; Ellingson, 1970; Ferriss et al.,1967). However, it demonstrated that when studying differences regarding threshold processing, infants’ state is essential to theVEP response. This can be due possibly to the fact that similar behavior state may reduce intra and intersubject variability in veryyoung infants, as suggested by Apkarian et al. (1991). Our study suggests that the infant’s neural response to different stimuli may bedepending on their behavior state (Prechtl, 1974). Regarding the neuro behavioral assessment, we hypothesized that one month old infants would respond to sensorial stimulation in two behavioral ways: (a) through an external response to thestimuli, and (b) through the infants’ ability to regulate them selvesin order to respond to that stimulation. These behavioral characteristics are translating social abilities displayed by very young infants (Brazelton and Nugent, 1995). We observed an association between a mature neuro behavioral outcome and the VEP’spositive N3 amplitude (once N3 is a negative component higheramplitude means more negativity) in the lower flash intensity. More over, once again, these results were only evident in infants that were awoken during the visual stimulation. Indeed, the brain development at young ages is characterized as a complex process that occurs very rapidly, namely a fast increase in synaptic density in the visual cortex in parallel with intense my elination ofthe visual tracts in the first four postnatal months (Dubois et al.,2008). The infant’s physiological response to sensorial stimulationis translated into behavioral characteristics that are associated with spending attentional resources in order to display adequate orienting / social interactive and regulating behavior outcomes (Atkinson,2002). In fact, infants show different sensorial stimulation inputnecessities and / or difficulties that are present early in the developmental process (Magnee et al., 2011). For instance, infants who display lower stimuli processing thresholds or seem too disorganized to deal with their context will need different stimuli inputs than those infants who are calmer or require more stimulation to react (Brazelton and Nugent, 1995). Further more, it has been suggested that in the first months of life infants present an increase
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