PubMed · 6062220
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
M I Posner. 1967. Short term memory systems in human information processing.. https://doi.org/10.1016/0001-6918(67)90069-8
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
Magnetoencephalography (MEG) measures the extracranial magnetic fields produced by intraneuronal ionic current flow within appropriately oriented cortical pyramidal cells. Based upon superconducting quantum interference device technology operating at liquid helium temperatures (4 K), MEG offers excellent temporal and spatial resolution for selected sources, and complements information obtained from electroencephalograms and other functional imaging strategies. Current instrumentation permits recording up to several hundred channels simultaneously with head-shaped dewars, although the cost of such systems is high. The fact that magnetic fields fall off with the square of the distance from the source is both a benefit (when separating activity in the two hemispheres) and a limitation (when attempting to record deep sources). The lack of skin contact facilitates using MEG to record direct current and very high frequency (> 600 Hz) brain activity. The clinical utility of MEG includes presurgical mapping of sensory cortical areas and localization of epileptiform abnormalities, and localization of areas of brain hypoperfusion in stroke patients. MEG studies in psychiatric disorders have contributed materially to improved understanding of anomalous brain lateralization in the psychoses, have suggested that P50 abnormalities may reflect altered gamma band activity, and have provided evidence of hemisphere-specific abnormalities of short-term auditory memory function.
A recent study indicates that schizophrenia patients are prone to auditory hallucinations because they have difficulty recognising their 'inner speech' as their own, and consequently tend to misattribute it to an external source.
Three different tests are applied to evaluate the performance of very young hearing impaired children. Three subgroups were formed according to hearing loss. The sound identification test as well as the Reynell Developmental Scales proved to be useful but Early Scales of Communication did not differentiate well enough between the three subgroups.