Why was Arithmetic chosen as a core subtest over Letter–Number Sequencing?

Arithmetic was chosen over Letter–Number Sequencing reasons similar to those for choosing Information over Comprehension. In addition, substantial revisions were made to the Arithmetic subtest to reduce the arithmetic knowledge necessary to complete items successfully and to eliminate superfluous irrelevant information. Research indicates that tasks involving cognitive arithmetic are sensitive to dementia.

Regarding the new WAIS-IV UK, is there a notional time when the old WAIS is not valid anymore. The reason that we publish these newer editions of assessments that we validate on a UK population is to provide the clinician with relevant theoretical updates and up to date normative data. We do not recommend using older versions of assessments when we have new editions with valid theory and up to date norms.

However, you need to use your professional judgement when deciding whether it would be more appropriate to use the WAIS-III UK or WAIS-IV UK with your participants. More.

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