Showing papers by "Christina M. Krause published in 2006"
TL;DR: It is proposed that alpha ERD/ERS responses reflect explicitly auditory memory processes, discriminating between auditory encoding and recognition, and may reflect also cognitive and/or memory processing, rather than merely the activity of the motor cortices.
105 citations
TL;DR: In this paper, the EEG oscillatory correlates of working memory in mild cognitive impairment (MCI) and Alzheimer's disease (AD) were studied using wavelet transforms in elderly controls, MCI patients and mild probable AD patients performing an auditory-verbal Sternberg memory task.
82 citations
TL;DR: The current findings suggest that EMF emitted by mobile phones has effects on brain oscillatory responses during cognitive processing in children.
Abstract: Purpose: To assess the effects of electromagnetic fields (EMF) emitted by mobile phones (MP) on the 1 – 20 Hz event-related brain oscillatory EEG (electroencephalogram) responses in children performing an auditory memory task (encoding and recognition).Materials and methods: EEG data were gathered while 15 subjects (age 10 – 14 years) performed an auditory memory task both with and without exposure to a digital 902 MHz MP in counterbalanced order.Results: During memory encoding, the active MP modulated the event-related desynchronization/synchronization (ERD/ERS) responses in the ∼4 – 8 Hz EEG frequencies. During recognition, the active MP transformed these brain oscillatory responses in the ∼4 – 8 Hz and ∼15 Hz frequencies.Conclusions: The current findings suggest that EMF emitted by mobile phones has effects on brain oscillatory responses during cognitive processing in children.
56 citations
TL;DR: This chapter reviews, summarizes, and discusses the findings on cognition- and memory-related ERD/ERS responses specifically in the auditory stimulus modality.
Abstract: In the year 1994, Krause et al. published an initial report of acoustically elicited electroencephalogram (EEG) event-related desynchronization (ERD)/ event-related synchronization (ERS) responses. Later, Krause et al. reported of distinct ERD/ERS responses during an auditory memory task: the encoding of acoustic material elicited alpha-frequency ERS whereas retrieval or recognition of the same stimulus material evoked alpha ERD. The research group of Krause and co-workers has published several reports on acoustically evoked ERD/ERS responses utilizing various cognitive tasks and diverse stimuli. Recently, also clinical studies have been initiated. This chapter reviews, summarizes, and discusses the findings on cognition- and memory-related ERD/ERS responses specifically in the auditory stimulus modality.
48 citations
TL;DR: Brain oscillatory ERD/ERS responses of the 4- to 30-Hz EEG frequency bands were examined during lexical decision where the task is to identify whether the presented stimulus is a word or a pseudoword to assess modality-specific brain oscillatory responses during cognitive processing.
31 citations
TL;DR: In this paper, a design experiment was performed to study whether idea-exchanging individuals outperform those who work independently, in conditions found beneficial based on theoretical implications, and the results are interpreted in terms of a dual influence model of idea exchange.
Abstract: Past research has demonstrated that there are several factors that oppose group efficiency in idea generation. However, recent developments in theory suggest that individuals may become socially and cognitively facilitated as a result of idea exchange with group members. A design experiment was performed to study whether idea-exchanging individuals outperform those who work independently, in conditions found beneficial based on theoretical implications. We developed a scheme in which designers exchanged ideas with other's momentarily during the idea generation process, and compared their performance to designers that worked without any interaction. The study demonstrated that although idea-exchanging individuals generated more ideas, their performance was not enhanced in terms of the diversity of idea production. The results are interpreted in terms of a dual influence model of idea exchange.
21 citations
TL;DR: The results of this preliminary study indicate that Parkinson's disease might affect brain oscillatory responses in the alpha frequency range in the encoding phase of auditory-verbal working memory.
20 citations
01 Jan 2006
TL;DR: Aivovauriopotilailta seka erilaisista keskushermoston sairauksista karsivilta henkiloilta saatu aineisto valottaa omalla tavallaan myos vaurioitumattomien aivojen toimintaa as discussed by the authors.
Abstract: Aivoja ja niiden toimintaa voidaan nykyaan tutkia monin erilaisin menetelmin. EEG (electroencephalogram) ja MEG (magnetoencephalogram) antavat aivojen toiminnasta ajallisesti tarkkaa (mutta vain kohtalaisella paikkatarkkuudella) informaatiota kun taas PET (positroniemissiotomografi a) ja fMRI (toiminnallinen magneettikuvantaminen) kertovat hyvalla paikkatarkkuudella missa kohden aivoja jokin prosessi toteutuu (mutta vain kohtuullisella aikatarkkuudella). Myos aivovauriopotilailta seka erilaisista keskushermoston sairauksista karsivilta henkiloilta saatu aineisto valottaa omalla tavallaan myos vaurioitumattomien aivojen toimintaa. 1990-lukua kutsuttiin ”aivojen vuosikymmeneksi” ja alkanutta 2000-lukua voitaneen kutsua ”aivokuvantamisen vuosikymmeneksi” menetelmallisen kehityksen vuoksi. Kahtena viime vuosikymmenena tutkimus on valottanut aivojen toimintaa enemman kuin koskaan aikaisemmin. Asian kaantopuolena voidaan todeta, etta olemme tiedostaneet, etta aivojen toiminta on niin monimutkaista, etta tiedamme ettemme viela tieda, miten aivot toimivat.
1 citations