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Neurophysiological evidence for whole form retrieval of complex derived words: a mismatch negativity study.

Hanna J, Pulvermüller F - Front Hum Neurosci (2014)

Bottom Line: We found that congruent derived words elicited a stronger MMN than incongruent derived words, beginning about 150 ms after perception of the critical morpheme.Using distributed source localization methods, the MMN enhancement for well-formed derivationally complex words appeared to be most prominent in the left inferior anterior-temporal, bilateral superior parietal and bilateral post-central, supra-marginal areas.In addition, neurophysiological results reflected the frequency of derived forms, thus providing further converging evidence for whole form storage and against a combinatorial mechanism.

View Article: PubMed Central - PubMed

Affiliation: Brain Language Laboratory, Department of Philosophy and Humanities, Freie Universität Berlin Berlin, Germany.

ABSTRACT
Complex words can be seen as combinations of elementary units, decomposable into stems and affixes according to morphological rules. Alternatively, complex forms may be stored as single lexical entries and accessed as whole forms. This study uses an event-related potential brain response capable of indexing both whole-form retrieval and combinatorial processing, the Mismatch Negativity (MMN), to investigate early brain activity elicited by morphologically complex derived words in German. We presented complex words consisting of stems "sicher" (secure), or "sauber" (clean) combined with abstract nominalizing derivational affixes -heit or -keit, to form either congruent derived words: "Sicherheit" (security) and "Sauberkeit" (cleanliness), or incongruent derived pseudowords: *"Sicherkeit", and *"Sauberheit". Using this orthogonal design, it was possible to record brain responses for -heit and -keit in both congruent and incongruent contexts, therefore balancing acoustic variance. Previous research has shown that incongruent combinations of symbols elicit a stronger MMN than congruent combinations, but that single words or constructions stored as whole forms elicit a stronger MMN than pseudowords or non-existent constructions. We found that congruent derived words elicited a stronger MMN than incongruent derived words, beginning about 150 ms after perception of the critical morpheme. This pattern of results is consistent with whole-form storage of morphologically complex derived words as lexical units, or mini-constructions. Using distributed source localization methods, the MMN enhancement for well-formed derivationally complex words appeared to be most prominent in the left inferior anterior-temporal, bilateral superior parietal and bilateral post-central, supra-marginal areas. In addition, neurophysiological results reflected the frequency of derived forms, thus providing further converging evidence for whole form storage and against a combinatorial mechanism.

No MeSH data available.


Signal space analysis (A) MMNs for Sicherheit, *Sicherkeit, shaded areas indicate 95% confidence intervals (B) MMNs for Sauberkeit, *Sauberheit and standard stimulus sauber, shaded areas indicate 95% confidence intervals. (C) Topographies of congruent (average of Sicherheit and Sauberkeit) and incongruent (average of *Sicherkeit and *Sauberheit) deviants, in the time windows selected for statistical comparison. (D) MMNs for congruent and incongruent conditions, green vertical lines indicate time windows for signal space analysis and topography display in (C). (E) Results of voxel-wise factorial ANOVAs of ERP data, converted into a 3d-volume. X and Y axes represent 2d electrode positions, and Z axis represents time. Gray voxels are where interaction of ROOT and SUFFIX factors reached p < 0.05, the orange cluster survived multiple-comparisons correction, and the purple voxels are where planned comparisons showed stronger responses for congruent conditions in both “sicher” and “sauber” conditions.
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Figure 3: Signal space analysis (A) MMNs for Sicherheit, *Sicherkeit, shaded areas indicate 95% confidence intervals (B) MMNs for Sauberkeit, *Sauberheit and standard stimulus sauber, shaded areas indicate 95% confidence intervals. (C) Topographies of congruent (average of Sicherheit and Sauberkeit) and incongruent (average of *Sicherkeit and *Sauberheit) deviants, in the time windows selected for statistical comparison. (D) MMNs for congruent and incongruent conditions, green vertical lines indicate time windows for signal space analysis and topography display in (C). (E) Results of voxel-wise factorial ANOVAs of ERP data, converted into a 3d-volume. X and Y axes represent 2d electrode positions, and Z axis represents time. Gray voxels are where interaction of ROOT and SUFFIX factors reached p < 0.05, the orange cluster survived multiple-comparisons correction, and the purple voxels are where planned comparisons showed stronger responses for congruent conditions in both “sicher” and “sauber” conditions.

Mentions: For source localization, conditions were averaged according to congruency (“Sicherheit” and “Sauberkeit” vs. *“Sicherkeit” and *“Sauberheit”). Distributed source localization was carried out with the multiple sparse priors (MSP) approach (Friston et al., 2008) in SPM8. Group inversion was performed, thereby constraining spatial source solutions uniformly across participants (Litvak and Friston, 2008). Voxel images were produced summarizing the source activity at time points of interest (Figure 5B), and smoothed with a kernel size of 12 mm. These images were then submitted to their respective multi-voxel paired sample t-test.


Neurophysiological evidence for whole form retrieval of complex derived words: a mismatch negativity study.

Hanna J, Pulvermüller F - Front Hum Neurosci (2014)

Signal space analysis (A) MMNs for Sicherheit, *Sicherkeit, shaded areas indicate 95% confidence intervals (B) MMNs for Sauberkeit, *Sauberheit and standard stimulus sauber, shaded areas indicate 95% confidence intervals. (C) Topographies of congruent (average of Sicherheit and Sauberkeit) and incongruent (average of *Sicherkeit and *Sauberheit) deviants, in the time windows selected for statistical comparison. (D) MMNs for congruent and incongruent conditions, green vertical lines indicate time windows for signal space analysis and topography display in (C). (E) Results of voxel-wise factorial ANOVAs of ERP data, converted into a 3d-volume. X and Y axes represent 2d electrode positions, and Z axis represents time. Gray voxels are where interaction of ROOT and SUFFIX factors reached p < 0.05, the orange cluster survived multiple-comparisons correction, and the purple voxels are where planned comparisons showed stronger responses for congruent conditions in both “sicher” and “sauber” conditions.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4222328&req=5

Figure 3: Signal space analysis (A) MMNs for Sicherheit, *Sicherkeit, shaded areas indicate 95% confidence intervals (B) MMNs for Sauberkeit, *Sauberheit and standard stimulus sauber, shaded areas indicate 95% confidence intervals. (C) Topographies of congruent (average of Sicherheit and Sauberkeit) and incongruent (average of *Sicherkeit and *Sauberheit) deviants, in the time windows selected for statistical comparison. (D) MMNs for congruent and incongruent conditions, green vertical lines indicate time windows for signal space analysis and topography display in (C). (E) Results of voxel-wise factorial ANOVAs of ERP data, converted into a 3d-volume. X and Y axes represent 2d electrode positions, and Z axis represents time. Gray voxels are where interaction of ROOT and SUFFIX factors reached p < 0.05, the orange cluster survived multiple-comparisons correction, and the purple voxels are where planned comparisons showed stronger responses for congruent conditions in both “sicher” and “sauber” conditions.
Mentions: For source localization, conditions were averaged according to congruency (“Sicherheit” and “Sauberkeit” vs. *“Sicherkeit” and *“Sauberheit”). Distributed source localization was carried out with the multiple sparse priors (MSP) approach (Friston et al., 2008) in SPM8. Group inversion was performed, thereby constraining spatial source solutions uniformly across participants (Litvak and Friston, 2008). Voxel images were produced summarizing the source activity at time points of interest (Figure 5B), and smoothed with a kernel size of 12 mm. These images were then submitted to their respective multi-voxel paired sample t-test.

Bottom Line: We found that congruent derived words elicited a stronger MMN than incongruent derived words, beginning about 150 ms after perception of the critical morpheme.Using distributed source localization methods, the MMN enhancement for well-formed derivationally complex words appeared to be most prominent in the left inferior anterior-temporal, bilateral superior parietal and bilateral post-central, supra-marginal areas.In addition, neurophysiological results reflected the frequency of derived forms, thus providing further converging evidence for whole form storage and against a combinatorial mechanism.

View Article: PubMed Central - PubMed

Affiliation: Brain Language Laboratory, Department of Philosophy and Humanities, Freie Universität Berlin Berlin, Germany.

ABSTRACT
Complex words can be seen as combinations of elementary units, decomposable into stems and affixes according to morphological rules. Alternatively, complex forms may be stored as single lexical entries and accessed as whole forms. This study uses an event-related potential brain response capable of indexing both whole-form retrieval and combinatorial processing, the Mismatch Negativity (MMN), to investigate early brain activity elicited by morphologically complex derived words in German. We presented complex words consisting of stems "sicher" (secure), or "sauber" (clean) combined with abstract nominalizing derivational affixes -heit or -keit, to form either congruent derived words: "Sicherheit" (security) and "Sauberkeit" (cleanliness), or incongruent derived pseudowords: *"Sicherkeit", and *"Sauberheit". Using this orthogonal design, it was possible to record brain responses for -heit and -keit in both congruent and incongruent contexts, therefore balancing acoustic variance. Previous research has shown that incongruent combinations of symbols elicit a stronger MMN than congruent combinations, but that single words or constructions stored as whole forms elicit a stronger MMN than pseudowords or non-existent constructions. We found that congruent derived words elicited a stronger MMN than incongruent derived words, beginning about 150 ms after perception of the critical morpheme. This pattern of results is consistent with whole-form storage of morphologically complex derived words as lexical units, or mini-constructions. Using distributed source localization methods, the MMN enhancement for well-formed derivationally complex words appeared to be most prominent in the left inferior anterior-temporal, bilateral superior parietal and bilateral post-central, supra-marginal areas. In addition, neurophysiological results reflected the frequency of derived forms, thus providing further converging evidence for whole form storage and against a combinatorial mechanism.

No MeSH data available.