Neural networks engaged in short-term memory rehearsal are disrupted by irrelevant speech in human subjects

Kopp, Franziska; Schröger, Erich; Lipka, Sigrid

doi:10.1016/j.neulet.2003.09.065

Cited by 20 publications

(25 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sauseng et al (2007) discussed that fronto-parietal coherence at theta frequency increased when the cognitive task required activation of other memory systems. Similar to Sarnthein et al (1998), memorization of five-word lists was associated with increased coherence in theta (4-7 Hz) and beta (13-20 Hz) frequency ranges (Kopp et al 2004). Our results are in line with these findings.…”

Section: Discussionmentioning

confidence: 87%

Memory load effect in auditory–verbal short-term memory task: EEG fractal and spectral analysis

et al. 2015

View full text Add to dashboard Cite

The objective of this preliminary study was to quantify changes in complexity of EEG using fractal dimension (FD) alongside linear methods of spectral power, event-related spectral perturbations, coherence, and source localization of EEG generators for theta (4-7 Hz), alpha (8-12 Hz), and beta (13-23 Hz) frequency bands due to a memory load effect in an auditory-verbal short-term memory (AVSTM) task for words. We examined 20 healthy individuals using the Sternberg's paradigm with increasing memory load (three, five, and seven words). The stimuli were four-letter words. Artifact-free 5-s EEG segments during retention period were analyzed. The most significant finding was the increase in FD with the increase in memory load in temporal regions T3 and T4, and in parietal region Pz, while decrease in FD with increase in memory load was registered in frontal midline region Fz. Results point to increase in frontal midline (Fz) theta spectral power, decrease in alpha spectral power in parietal region-Pz, and increase in beta spectral power in T3 and T4 region with increase in memory load. Decrease in theta coherence within right hemisphere due to memory load was obtained. Alpha coherence increased in posterior regions with anterior decrease. Beta coherence increased in fronto-temporal regions. Source localization delineated theta activity increase in frontal midline region, alpha decrease in superior parietal region, and beta increase in superior temporal gyrus with increase in memory load. In conclusion, FD as a nonlinear measure may serve as a sensitive index for quantifying dynamical changes in EEG signals during AVSTM tasks.

show abstract

Section: Discussionmentioning

confidence: 87%

Memory load effect in auditory–verbal short-term memory task: EEG fractal and spectral analysis

et al. 2015

View full text Add to dashboard Cite

show abstract

“…EEG studies of WM consistently reported the involvement of prefrontal cortex (PFC) (Sarthein, Petsche, Rappelsberger, Shaw, & von Stein, 1998), left frontal region (Kopp, Schröger, & Lipka, 2004) and both dorsal and ventral PFC (Rutar Gorišek et al, 2015) in WM networks. All of this suggests that Broca's area and its vicinity might be an important node in WM networks, yet how these networks are affected by a lesion in this region is largely unknown.…”

Section: Introductionmentioning

confidence: 99%

Beyond aphasia: Altered EEG connectivity in Broca’s patients during working memory task

et al. 2016

View full text Add to dashboard Cite

“…Alpha frequency ($7-13 Hz) responses have been associated with 'alertness' and attention [Klimesch et al, 1992] as well as semantic memory processes [Klimesch, 1994[Klimesch, , 1996Klimesch et al, 1998;Doppelmayr et al, 2000]. Beta frequency ($20 Hz) responses were first associated with the activity of motor cortices in relation to movement [Stancak and Pfurtscheller, 1996;Pfurtscheller et al, 1998], movement planning [Kaiser et al, 2001;Alegre et al, 2003] and motor imagery [Pfurtscheller and Neuper, 1997] but recently beta rhythm responses have also been reported in association with cognitive and linguistic processing Rappelsberger, 1996, 1998;Pulvermuller et al, 1999;Tallon-Baudry, 2003;Karrasch et al, 2004;Kopp et al, 2004;Bastiaansen et al, 2005;Pesonen et al, 2006]. By studying brain oscillatory responses during cognitive processing, we can assess the temporal arrangement of the neural oscillatory networks contributing to the cognitive process.…”

Section: Introductionmentioning

confidence: 99%

Effects of pulsed and continuous wave 902 MHz mobile phone exposure on brain oscillatory activity during cognitive processing

Krause

Pesonen

Björnberg

et al. 2007

Bioelectromagnetics

View full text Add to dashboard Cite

The aim of the current double-blind studies was to partially replicate the studies by Krause et al. [2000ab, 2004] and to further investigate the possible effects of electromagnetic fields (EMF) emitted by mobile phones (MP) on the event-related desynchronisation/synchronisation (ERD/ERS) EEG (electroencephalogram) responses during cognitive processing. Two groups, both consisting of 36 male participants, were recruited. One group performed an auditory memory task and the other performed a visual working memory task in six exposure conditions: SHAM (no EMF), CW (continuous wave EMF) and PM (pulse modulated EMF) during both left- and right-side exposure, while the EEG was recorded. In line with our previous studies, we observed that the exposure to EMF had modest effects on brain oscillatory responses in the alpha frequency range ( approximately 8-12 Hz) and had no effects on the behavioural measures. The effects on the EEG were, however, varying, unsystematic and inconsistent with previous reports. We conclude that the effects of EMF on brain oscillatory responses may be subtle, variable and difficult to replicate for unknown reasons.

show abstract

Neural networks engaged in short-term memory rehearsal are disrupted by irrelevant speech in human subjects

Cited by 20 publications

References 20 publications

Memory load effect in auditory–verbal short-term memory task: EEG fractal and spectral analysis

Memory load effect in auditory–verbal short-term memory task: EEG fractal and spectral analysis

Beyond aphasia: Altered EEG connectivity in Broca’s patients during working memory task

Effects of pulsed and continuous wave 902 MHz mobile phone exposure on brain oscillatory activity during cognitive processing

Contact Info

Product

Resources

About