These deactivations in PTSD patients might implicate an active inhibition of dorsolateral prefrontal neural activity during retrieval of working memory.ĭigit span Functional near infrared spectroscopy (fNIRS) Hemispheric emotional valence (HEV) Post-traumatic stress disorder (PTSD) Topography Working memory. rior in their digit span to subjects with Down syndrome, but Down subjects. This deactivation was more pronounced in the right dorsolateral prefrontal cortex during the retrieval phase. The PTSD participants, but not the controls, appeared to suppress prefrontal activity during memory retrieval. What kind of memory deficit does patient KF has He has damaged ST - an impaired digit span. In contrast, the veterans with PTSD were found to have activations during the encoding process, but followed by distinct deactivations during the retrieval process. Digit span is used as a measure of the capacity of short-term memory. The healthy controls showed robust hemodynamic activations during the encoding and retrieval processes. 268), basing his conclu- sion mainly on a task involving the reproduc- tion of visual designs. Patients with left hemisphere lesions are known to have a poor digit span (McFie, 1960), a task which demands accurate repetition, but the relationship of this defect to other aspects of language and memory was not examined. If you are a student and wish to access these resources, ask your school to subscribe. An event-related experimental design was utilized to dissociate the different phases (i.e., encoding, maintenance and retrieval) of working memory. Likewise, neuropsychological evidence such as the existence of patients with selectively disabled verbal (e.g., patient KF, Shallice & Warrington, 1970) and visual (e.g., de Renzi & Nichelli, 1975) digit span suggested that verbal and visual working-memory systems are somewhat separable as well. Indeed, Talland (1965) refers to the normal digit span of his amnesic Korsakoff patients as 'a notable exception to their short-term memory disorder' (p. In line with the IB Learner Profile, Act with integrity and honesty. Multichannel functional near infrared spectroscopy (fNIRS) was utilized to measure prefrontal cortex hemodynamic activations during memory of neutral (i.e., not trauma-related) forward and backward digit span tasks. In this study, the involvement of the prefrontal cortex in working memory phases was assessed among veterans with PTSD and age-/gender-matched healthy controls. STM was damaged (digit span of 1), but LTM was normal He remembers words better if presented visually as opposed to auditorally. However, most studies have used block designs and could not dissociate the multiple phases of working memory. Neuroimaging studies of post-traumatic stress disorder (PTSD)-related memory impairments have consistently implicated abnormal activities in the frontal and parietal lobes.
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