A mechanism called the episodic buffer was later added to the model. Īccording to a theory by Alan Baddeley and Graham Hitch, working memory is under the influence of three key mechanisms: the visuospatial sketchpad, the central executive, and the phonological loop. For example, a person will better remember a sequence in their first-language than their second-language a person will also remember a sequence of words better than they would a sequence of nonsense syllables. Įxperiments in memory span have found that the more familiar a person is with the type of subject matter presented to them, the more they will remember it in a novel setting. To generalize, it refers to the ability of an individual to reproduce immediately, after one presentation, a series of discrete stimuli in their original order. Backward memory span is a more challenging variation which involves recalling items in reverse order.įunctionally, memory span is used to measure the number of discrete units over which the individual can successively distribute his attention and still organize them into a working unit. It is also a component of cognitive ability tests such as the WAIS. Memory span is a common measure of working memory and short-term memory. The task is known as digit span when numbers are used. Items may include words, numbers, or letters. Journal of Clinical Psychology, 28, 361.In psychology and neuroscience, memory span is the longest list of items that a person can repeat back in correct order immediately after presentation on 50% of all trials. Digit span in right and left hemiplegics. Weinberg, J., Diller, L., Gerstman, L., & Schulman, L. San Antonio, TX: Psychological Corporation. The Wechsler adult intelligence scale-III. Baltimore: Williams and Wilkins Corporation. The measurement and appraisal of adult intelligence (3rd ed.). The measurement and appraisal of adult intelligence (1st ed.). The measurement of intelligence: An explanation of and a complete guide for the use of the Stanford revision and extension of the Binet-Simon intelligence scale. Relation of forward and backward digit repetition to neurological impairment in children with learning disabilities. Measurements of short-term memory: A historical review. Archives of Clinical Neuropsychology, 12, 29–40. Forward and backward memory span should not be combined for clinical analysis. Separate digits tests: A brief history, a literature review, and a reexamination of the factor structure of the Test of Memory and Learning (TOMAL). The magical number seven, plus or minus two: Some limits on our capacity for processing information. The Clinical Neuropsychologist – Vascular Dementia Special Edition, 18, 83–100. From Binswanger’s disease to Leukoaraiosis: What we have learned about subcortical vascular dementia. Alterations in working memory as a function of leukoaraiosis in dementia. Capacity to maintain mental set in dementia. The impact of region-specific leukoaraiosis on working memory deficits in dementia. San Antonio, TX: The Psychological Corporation. The WAIS-R as a neuropsychological instrument. Kaplan, E., Fein, D., Morris, R., & Delis, D. Washington, DC: The American Psychological Association. Bryant (Eds.), Clinical neuropsychology and brain function: Research, measurement, and practice: Master lectures. A process approach to neuropsychological assessment. Mechanism in thought and morals: An address delivered before the Phi Beta Kappa Society of Harvard University, June 29, 1870, with notes and afterthoughts. Memory: A contribution to experimental psychology (Ruger HA and Bussenius CE, Trans) (Original work published in 1885). Cognitive and Behavioral Neurology, 17, 74–83.Įbbinghaus, H. Clock drawing errors in dementia: Neuropsychological and neuroanatomic considerations. Bower, The psychology of learning and motivation: Advances in research and theory (vol.
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