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Neural Correlates of Subliminal Language Processing.

Axelrod V, Bar M, Rees G, Yovel G - Cereb. Cortex (2014)

Bottom Line: The results of several functional magnetic resonance imaging studies have suggested that unconscious lexical and semantic processing is confined to the posterior temporal lobe, without involvement of the frontal lobe-the regions that are indispensable for conscious language processing.We found that subjectively and objectively invisible meaningful sentences and unpronounceable nonwords could be discriminated not only in the left posterior superior temporal sulcus (STS), but critically, also in the left middle frontal gyrus.We conclude that frontal lobes play a role in unconscious language processing and that activation of the frontal lobes per se might not be sufficient for achieving conscious awareness.

View Article: PubMed Central - PubMed

Affiliation: The Gonda Multidisciplinary Brain Research Center, Bar Ilan University, Ramat Gan, Israel UCL Institute of Cognitive Neuroscience.

No MeSH data available.


Related in: MedlinePlus

Prediction rate of discrimination between subliminal meaningful sentences and nonwords in language network regions in the temporal lobe (A) and the frontal lobe (B). Black line is a chance level = 50%; error bars denote standard error of the mean.
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BHU022F3: Prediction rate of discrimination between subliminal meaningful sentences and nonwords in language network regions in the temporal lobe (A) and the frontal lobe (B). Black line is a chance level = 50%; error bars denote standard error of the mean.

Mentions: The performance of the support vector machine in distinguishing subliminal meaningful sentences from nonwords in the parieto-temporal ROIs is shown in Figure 3A. Group-level statistical significance was assessed using one-tailed t-tests against chance level of 50% (Bonferroni multiple comparison correction, see Materials and Methods). The only parieto-temporal region, which showed prediction significantly above chance was left posterior STS: 56.2% (MSE: 2%, t(14) = 3.01, P = 0.004). Prediction rate in the right posterior STS was greater than chance (53.1% [MSE: 1.6%]), but it did not reach statistical significance after multiple comparison correction (t(14) = 1.93, P = 0.036)]. Performance in the other ROIs did not differ from chance: left supramarginal gyrus: 53.1% (MSE: 2.8%, t(14) = 1.1, P = 0.22), left angular gyrus: 51.6% (MSE: 2.5%, t(14) < 1), left middle anterior temporal: 49.9% (MSE: 2%, t(14) < 1), left anterior temporal: 50.7% (MSE: 2.7%, t(14) < 1) and right middle anterior temporal: 49.1% (MSE: 2.8%, t(14) < 1). To compare the prediction rates between hemispheres, for 2 regions which were localized in both hemispheres (the posterior STS and the middle anterior temporal region) we ran a 2-way repeated measures ANOVA with a region and a hemisphere as factors. The results showed significant main effect of region [F1,14 = 7.781, P = 0.014], but no significant effect of hemisphere [F1,14 < 1] and no significant interaction [F1,14 < 1] suggesting that higher prediction rate in the posterior STS comparing to the middle anterior temporal was a property of both hemispheres.Figure 3.


Neural Correlates of Subliminal Language Processing.

Axelrod V, Bar M, Rees G, Yovel G - Cereb. Cortex (2014)

Prediction rate of discrimination between subliminal meaningful sentences and nonwords in language network regions in the temporal lobe (A) and the frontal lobe (B). Black line is a chance level = 50%; error bars denote standard error of the mean.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494027&req=5

BHU022F3: Prediction rate of discrimination between subliminal meaningful sentences and nonwords in language network regions in the temporal lobe (A) and the frontal lobe (B). Black line is a chance level = 50%; error bars denote standard error of the mean.
Mentions: The performance of the support vector machine in distinguishing subliminal meaningful sentences from nonwords in the parieto-temporal ROIs is shown in Figure 3A. Group-level statistical significance was assessed using one-tailed t-tests against chance level of 50% (Bonferroni multiple comparison correction, see Materials and Methods). The only parieto-temporal region, which showed prediction significantly above chance was left posterior STS: 56.2% (MSE: 2%, t(14) = 3.01, P = 0.004). Prediction rate in the right posterior STS was greater than chance (53.1% [MSE: 1.6%]), but it did not reach statistical significance after multiple comparison correction (t(14) = 1.93, P = 0.036)]. Performance in the other ROIs did not differ from chance: left supramarginal gyrus: 53.1% (MSE: 2.8%, t(14) = 1.1, P = 0.22), left angular gyrus: 51.6% (MSE: 2.5%, t(14) < 1), left middle anterior temporal: 49.9% (MSE: 2%, t(14) < 1), left anterior temporal: 50.7% (MSE: 2.7%, t(14) < 1) and right middle anterior temporal: 49.1% (MSE: 2.8%, t(14) < 1). To compare the prediction rates between hemispheres, for 2 regions which were localized in both hemispheres (the posterior STS and the middle anterior temporal region) we ran a 2-way repeated measures ANOVA with a region and a hemisphere as factors. The results showed significant main effect of region [F1,14 = 7.781, P = 0.014], but no significant effect of hemisphere [F1,14 < 1] and no significant interaction [F1,14 < 1] suggesting that higher prediction rate in the posterior STS comparing to the middle anterior temporal was a property of both hemispheres.Figure 3.

Bottom Line: The results of several functional magnetic resonance imaging studies have suggested that unconscious lexical and semantic processing is confined to the posterior temporal lobe, without involvement of the frontal lobe-the regions that are indispensable for conscious language processing.We found that subjectively and objectively invisible meaningful sentences and unpronounceable nonwords could be discriminated not only in the left posterior superior temporal sulcus (STS), but critically, also in the left middle frontal gyrus.We conclude that frontal lobes play a role in unconscious language processing and that activation of the frontal lobes per se might not be sufficient for achieving conscious awareness.

View Article: PubMed Central - PubMed

Affiliation: The Gonda Multidisciplinary Brain Research Center, Bar Ilan University, Ramat Gan, Israel UCL Institute of Cognitive Neuroscience.

No MeSH data available.


Related in: MedlinePlus