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80% of cases are also know as a “schemic stroke”, or the formation of a blood clot in a vessel supplying blood to the brain. 20% of cases are a hemorrhage in the brain caused by a rupture or leakage from a blood vessel.

The MVPT can be used to determine differences in visual perception across several different diagnostic groups, and is often used by occupational therapists to screen those with stroke Also called a “brain attack” and happens when brain cells die because of inadequate blood flow. What types of clients can the tool be used for?

Visual perception independent of motor ability. Note: Because the test requires no use of verbal response by the respondent, if the clinician can determine through the use of the practice items that the individual understands the task requirements, then it is possible to use the test with minimal language use. No information is currently available regarding the languages in which the instructions to the MVPT have been translated. In what languages is the measure available?

The MVPT-V removes unilateral visual neglect as a variable in test performance and therefore should not be used to assess driving ability (Mazer et al., 1998).

There are many variations on the measurement of reliability including alternate-forms, internal consistency, inter-rater agreement, intra-rater agreement, and test-retest. Systematic error refers to bias that influences scores in a specific direction in a fairly consistent way, e.g., one neurologist in a group tends to rate all patients as being more disabled than do other neurologists in the group. Random error refers to “noise” in the scores due to chance factors, e.g., a loud noise distracts a patient thus affecting his performance, which, in turn, affects the score. True variation is that variation which actually reflects differences in the construct under study, e.g., the actual severity of neurological impairment. The total variation in any given score may be thought of as consisting of true variation (the variation of interest) and error variation (which includes random error as well as systematic error).

A more technical definition of reliability is that it is the proportion of “true” variation in scores derived from a particular measure. It is generally understood to be the extent to which a measure is stable or consistent and produces similar results when administered repeatedly. Therefore, the MVPT-3 should only be used as a diagnostic tool in adolescents between 14-18 years old because this is the only age group in which reliability Reliability can be defined in a variety of ways. The most recent version of the measure, the MVPT-3, can be administered to children (> 3 years), adolescents, and adults ( 3 years), adolescents, and adults ( 0.90 to be used for diagnostic and decision-making purposes (Sattler, 2001). It was originally developed for use with children (Colarusso & Hammill, 1972), however it has been used extensively with adults. Unlike other typical visual perception measures, this measure is meant to assess visual perception independent of motor ability. The Motor-Free Visual Perception Test (MVPT) is a widely used, standardized test of visual perception.