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Ergebnisse 2 Einträge
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Standard diagnostic procedures for assessing temporal-processing abilities of adult patients with aphasia have so far not been developed. In our study, temporal-order measurements were conducted using two different experimental procedures to identify a suitable measure for clinical studies. Additionally, phoneme-discrimination abilities were tested on the word, as well as on the sentence level, as a relationship between temporal processing and phoneme-discrimination abilities is assumed. Patients with aphasia displayed significantly higher temporal-order thresholds than control subjects. The detection of an association between temporal processing and speech processing, however, depended on the stimuli and the phoneme-discrimination tasks used. Our results also suggest top-down feedback on phonemic processing.
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Analyses of neural mechanisms of duration processing are essential for the understanding of psychological phenomena which evolve in time. Different mechanisms are presumably responsible for the processing of shorter (below 500 ms) and longer (above 500 ms) events but have not yet been a subject of an investigation with functional magnetic resonance imaging (fMRI). In the present study, we show a greater involvement of several brain regions - including right-hemispheric midline structures and left-hemispheric lateral regions - in the processing of visual stimuli of shorter as compared to longer duration. We propose a greater involvement of lower-level cognitive mechanisms in the processing of shorter events as opposed to higher-level mechanisms of cognitive control involved in longer events.
Erkunden
Team
- Wittmann (2)
Eintragsart
Sprache
- Englisch (2)
Thema
- Time Factors
- Adult (2)
- Aged (1)
- Aged, 80 and over (1)
- Aphasia/*physiopathology (1)
- Auditory Perception/*physiology (1)
- Brain Mapping (1)
- Brain/*physiology (1)
- Case-Control Studies (1)
- Cognition/physiology (1)
- *Comprehension/physiology (1)
- *Discrimination, Psychological/physiology (1)
- Discrimination, Psychological/*physiology (1)
- Female (2)
- Humans (2)
- Language (1)
- Magnetic Resonance Imaging (1)
- Male (2)
- Middle Aged (1)
- Multivariate Analysis (1)
- Neuropsychological Tests (1)
- Photic Stimulation (1)
- Time Perception/*physiology (1)
- Visual Perception/*physiology (1)
- Young Adult (1)