Modality matters: The effects of stimulus modality on the 4- to 30-Hz brain electric oscillations during a lexical decision task

Krause, Christina M.; Gronholm, Petra C.; Leinonen, Alina; Laine, Matti; Säkkinen, Anna-Leena; Söderholm, Carina

doi:10.1016/j.brainres.2006.06.100

Cited by 25 publications

(25 citation statements)

References 66 publications

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“…Untrained novel words (i.e., pseudowords) elicited lower theta power than existing words over left frontotemporal channels, in line with previous findings of lexicality effects localized to the left frontal and temporal cortex (Marinkovic et al, 2012;Krause et al, 2006). This difference weakened when novel words had been learned immediately before testing, but novel words became indistinguishable from real words only after a 24-hr consolidation period.…”

Section: Discussionsupporting

confidence: 84%

“…For example, pseudowords have repeatedly been found to elicit lower theta power than real words (Krause et al, 2006). This difference was largest in the left inferior prefrontal and temporal cortex, known to be involved in lexical storage (Marinkovic, Rosen, Cox, & Kovacevic, 2012).…”

Section: Introductionmentioning

confidence: 97%

“…During language comprehension, a decrease in alpha power relative to a prestimulus baseline is generally seen at posterior sites (Mellem, Bastiaansen, Pilgrim, Medvedev, & Friedman, 2012;Tavabi, Embick, & Roberts, 2011;Shahin, Picton, & Miller, 2009;Krause et al, 2006;Bastiaansen et al, 2005;Bastiaansen, van Berkum, & Hagoort, 2002;Klimesch et al, 2001) and over left occipitotemporal and central areas in the beta band (Krause et al, 2006;Bastiaansen et al, 2005). Alpha and beta decreases are often interpreted as reflecting visual processing, attention, and memory/task demands (e.g., Shahin et al, 2009;Bastiaansen & Hagoort, 2006;Klimesch et al, 2001).…”

Section: Introductionmentioning

confidence: 98%

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Changes in Theta and Beta Oscillations as Signatures of Novel Word Consolidation

Bakker

Takashima

Hell

et al. 2015

Journal of Cognitive Neuroscience

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The complementary learning systems account of word learning states that novel words, like other types of memories, undergo an offline consolidation process during which they are gradually integrated into the neocortical memory network. A fundamental change in the neural representation of a novel word should therefore occur in the hours after learning. The present EEG study tested this hypothesis by investigating whether novel words learned before a 24-hr consolidation period elicited more word-like oscillatory responses than novel words learned immediately before testing. In line with previous studies indicating that theta synchronization reflects lexical access, unfamiliar novel words elicited lower power in the theta band (4-8 Hz) than existing words. Recently learned words still showed a marginally lower theta increase than existing words, but theta responses to novel words that had been acquired 24 hr earlier were indistinguishable from responses to existing words. Consistent with evidence that beta desynchronization (16-21 Hz) is related to lexical-semantic processing, we found that both unfamiliar and recently learned novel words elicited less beta desynchronization than existing words. In contrast, no difference was found between novel words learned 24 hr earlier and existing words. These data therefore suggest that an offline consolidation period enables novel words to acquire lexically integrated, word-like neural representations.

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Section: Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Changes in Theta and Beta Oscillations as Signatures of Novel Word Consolidation

Bakker

Takashima

Hell

et al. 2015

Journal of Cognitive Neuroscience

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“…Similarly, greater phase coherence across trials was exhibited in comparable time windows in theta band at all electrode sites, immediately preceded by responses in central and bilateral frontal regions and followed by synchronous activities in right occipital, left frontal and central locations later on. Greater theta ERS for visually presented pseudowords over the occipital region echoes the findings of lexicality effects in Krause et al (2006), although the temporal window of activity that we observed took place much earlier. The mechanism underlying early neural responses reflected in greater ITC over the central and bilateral frontal regions is also unclear.…”

Section: Discussionsupporting

confidence: 82%

“…We focused in particular on activities in the theta (4-7 Hz) and gamma (> 30 Hz) bands. The former is sensitive to psycholinguistic effects at different processing levels including lexicality (Krause et al, 2006), whereas the latter signals synchronization of activity at the cortical networks level (Bastiaansen & Hagoort, 2003). Second, the present study employed single-trial and single subject analyses (Bishop & Hardiman, 2010).…”

Section: Introductionmentioning

confidence: 99%

Deficits in Processing Characters in Chinese Developmental Dyslexia: Preliminary Results From Event-related Potentials and Time Frequency Analyses

Su¹,

Lau²,

Zhang³

et al. 2011

IJL

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Individuals with dyslexia have deficiencies in lexical organization and processing that are behaviorally manifested as difficulties in learning grapheme-phoneme correspondences. The present study investigates the lexical representations of Chinese reading-impaired children using event-related potentials (ERP) and time-frequency analysis. Two Cantonese-speaking male children, one with reading impairment (PR) and one with normal reading performance (CA), performing a character recognition task were conducted. ERP results indicated that CA showed lexicality effect at N400 and N170 that was not evident in PR. The time-frequency analyses found greater event-related synchronization and phase coherence at theta band suggesting greater cognitive demand in processing pseudowords than real words for CA. Greater synchronization between cortical regions was also observed at the gamma band for pseudowords. These differences were not found for PR, suggesting that PR may have weaker lexical representations, resulting in inefficient orthographic processing and perhaps difficulties in accessing phonological and/or semantic information of known characters.

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Neuromagnetic functional coupling during dichotic listening of speech sounds

Brancucci

Penna

Babiloni

et al. 2007

Human Brain Mapping

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The present magnetoencephalography (MEG) study tested the hypothesis of a phase synchronization (functional coupling) of cortical alpha rhythms (about 6-12 Hz) within a "speech" cortical neural network comprising bilateral primary auditory cortex and Wernicke's areas, during dichotic listening (DL) of consonant-vowel (CV) syllables. Dichotic stimulation was done with the CV-syllable pairs /da/-/ba/ (true DL, yielded by stimuli having high spectral overlap) and /da/-/ka/ (sham DL, obtained with stimuli having poor spectral overlap). Whole-head MEG activity (165 sensors) was recorded from 10 healthy right-handed non-musicians showing right ear advantage in a speech DL task. Functional coupling of alpha rhythms was defined as the spectral coherence at the following bands: alpha 1 (about 6-8 Hz), alpha 2 (about 8-10 Hz), and alpha 3 (about 10-12) with respect to the peak of individual alpha frequency. Results showed an inverse pattern of functional coupling: during DL of speech sounds, spectral coherence of the high-band alpha rhythms increased between left auditory and Wernicke's areas with respect to sham DL, whereas it decreased between left and right auditory areas. The increase of functional coupling within the left hemisphere would underlie the processing of the syllable presented to the right ear, which arrives to the left auditory cortex without the interference of the other syllable presented to the left ear. Conversely, the decrease of inter-hemispherical coupling of the high-band alpha might be due to the fact that the two auditory cortices do not receive the same information from the ears during DL. These results suggest that functional coupling of alpha rhythms can constitute a neural substrate for the lateralization of auditory stimuli during DL.

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Modality matters: The effects of stimulus modality on the 4- to 30-Hz brain electric oscillations during a lexical decision task

Cited by 25 publications

References 66 publications

Changes in Theta and Beta Oscillations as Signatures of Novel Word Consolidation

Changes in Theta and Beta Oscillations as Signatures of Novel Word Consolidation

Deficits in Processing Characters in Chinese Developmental Dyslexia: Preliminary Results From Event-related Potentials and Time Frequency Analyses

Neuromagnetic functional coupling during dichotic listening of speech sounds

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