Recently, two studies of patients have correlated digit- span scores with structural indices of brain. These preliminary results suggest that verbal working memory spans as measured by digit spans are impaired in schizophrenic patients. who had only a two-digit auditory span due to brain damage from a road accident, hence impaired STM. Working memory deficits associated with schizophrenia appear to be generalized and not limited to the spatial modality. Warrington found that their amnesiac patient KF had poor STM recall for. age and maintenance components of working memory. Shallice and Warrington (1970) reported the case of K.F. (pp155 161) who had seriously deficient STM function (digit span of 2) yet normal LTM performance. These results indicate that the forward and backward digit span tasks tap different cognitive abilities that are differentially associated with the diathesis for schizophrenia. Working Memory Capacity: digit span test. Read the pairs of digits rhythmically aloud. Schizophrenia patients showed impairment on both the forward and backward digit span tasks. auditory presentation leads to larger memory span estimates than visual presentation rhythmic presentation. What is the mean average digit span for a) letters b) numbers. Forest plot of digit span backwards meta-analysis. The nonpsychotic relatives showed no impairment on the forward digit span task, a measure of general attention, but did show impairment on the backward digit span task, a measure of verbal working memory. The format in which information is stored in the various memory stores. Impaired verbal memory was a reliable finding in patients with schizophrenia compared to healthy. Patients’ performance was significantly better on forward digit span compared to backward digit span (t(70) 10.532, P < 0.001), with every patient having a forward digit span score equal or greater than their backward digit span score. The Wechsler Digit Span Task was used to investigate verbal working memory in 52 schizophrenia patients, 56 of their first-degree relatives, and 73 nonpsychiatric comparison subjects. Few studies have evaluated verbal working memory in the first-degree relatives of schizophrenia patients, who likely share the genetic diathesis for schizophrenia but not the potential confounds associated with chronic mental illness. The evidence for verbal working memory deficits in schizophrenia has been inconsistent.
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