57 research outputs found

    Statistical maps of BOLD activation induced by the different stimuli in left and right MLd.

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    <p>Results are superimposed on sagittal anatomical slices coming from the MRI zebra finch atlas. T values are color coded according to the scale displayed at the bottom of the figure. Note that the analysis was restricted to MLd and only voxels found to be significant (one-tailed t-test, p<0.05, corrected at MLd level) are displayed. D: dorsal, V: ventral, A: anterior, P: posterior.</p

    Correlation of TUT, BOS and CON responsiveness with vocal learning strength in left NCM.

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    <p>TUT, BOS and CON responsiveness are expressed as the mean amplitude estimates of the BOLD activations [TUT minus Rest], [BOS minus Rest] and [CON minus Rest], in non-dimensional unit) in the left NCM cluster illustrated in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0061764#pone-0061764-g008" target="_blank">Fig. 8</a>. Note that the R<sup>2</sup> value in the left panel (0.3089) corresponds to the correlation value between learning strength and the [TUT minus Rest] signal averaged over the NCM cluster illustrated in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0061764#pone-0061764-g008" target="_blank">Fig. 8</a> whereas the value reported in the text (0.36) corresponds to the correlation in the voxel where this correlation is the highest (R<sup>2</sup><sub>max</sub>). These two R<sup>2</sup> values are significantly different than 0. Correlation of BOS and CON responsiveness with learning strength are not significant.</p

    Correlation of TUT (left) and BOS (right) selectivity with vocal learning strength in right MLd.

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    <p>TUT and BOS selectivity are expressed as the mean amplitude estimate of the differential BOLD signals of [TUT minus CON], and [BOS minus CON], in non-dimensional units. Positive values on the y axis indicate a higher activation induced by TUT (or BOS) compared to CON while negative values indicate a higher activation induced by CON compared to TUT (or BOS). Both correlations are statistically significant.</p

    Schematic representation of the songbird brain (parasagittal view).

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    <p>The auditory regions are in blue and the vocal motor regions in grey. Only the main connections are represented. NIf: nucleus interface of the nidopallium; Ov: nucleus ovoidalis; RA: nucleus robustus of the arcopallium; Uva: nucleus uvaeformis; CN: cochlear nucleus.</p

    Illustration of the predefined regions of interest on sagittal and axial anatomical images.

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    <p>The anatomical images come from the zebra finch MRI atlas. L: left, R: right, D: dorsal, V: ventral, A: anterior, P: posterior.</p

    Correlation map of [TUT minus Rest] versus vocal learning strength in left NCM.

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    <p>Results are superimposed on sagittal and axial anatomical slices coming from the zebra finch MRI atlas and displayed at a p threshold of 0.05 without correction for multiple tests. R<sup>2</sup> values are color coded according to the scale displayed at the right side of the figure. D: dorsal, V: ventral, A: anterior, P: posterior; L: left; R: right.</p

    Statistical maps of BOLD activation induced by all stimuli together.

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    <p>Results (compared to Rest) are superimposed on anatomical sagittal and axial images coming from the MRI zebra finch atlas. T values are color coded according to the scale displayed on the right side of the figure. Only significant voxels (one-tailed t-test, p<0.05, corrected at the whole brain level) are displayed. L: left, R: right, D: dorsal, V: ventral, A: anterior, P: posterior.</p

    Sonograms illustrating the song tutoring protocol for two experimental birds (Bird 1 and Bird 2).

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    <p>Tutors 1 and 2 learned their song from the same song model (via tape playback) while experimental birds 1 and 2 learned their song by being housed with respectively tutor 1 and tutor 2 (one-to-one paradigm). As a result, songs of Bird 1 and 2 were acoustically close. During the fMRI experiment, bird 1 was exposed to the song of bird 1 (BOS), the song of Tutor 1 (TUT) and the song of Bird 2 (CON).</p

    Correlation between MRI signals and the acoustic similarity between the stimuli in right MLd.

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    <p>The MRI signals (expressed in non-dimensional units) correspond to the mean amplitude estimate of the differential BOLD signals between TUT and CON (left), BOS and CON (middle) and TUT and BOS (right). Positive values on the y axis indicate higher activations induced by the first stimulus of the comparison than the second one while negative values indicate higher activations induced by the second stimulus of the comparison than the first one. All correlations are statistically non-significant.</p

    Striatal functional connectivity maps resulting from 15 and 40 components ICA (GIFT) of rat rsfMRI.

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    <p>The figure shows 4 axial slices of mean components, located at the striatum. The spatial colour-coded z-maps of these components are overlaid on the GE-EPI image. A higher z-score (yellow) represents a higher correlation between the time course of that voxel and the mean time course of this component. For the 15 component analysis (A) the striatum was shown confined in only one component but was divided over two components for the 40 component analysis (B & C).</p
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