Thomas R. Shaffer
Cancellation tests are simple instruments that have traditionally been used to study sustained attention. Common formats follow a test pattern in which rows of letters symbols or numbers are randomly interspersed with designated targets. Test participants are generally asked to identify targets while ignoring similar non-target distracter items. In the current study we present normative data on a new cancellation instrument developed at SDSU. We present guidelines for administration, as well as normative data on omission errors, commission errors, mean target hit rates, processing speed performance, and test-retest reliability for 102 undergraduate participants in the 18-25 year old age range. Statistical analysis suggests that the NIMH-SDSU Letter Cancellation Protocol has high test-retest reliability, but is also susceptible to practice effects when subsequent administrations occur within 5 weeks.
Kalina, Ashley N. and Walgrave, Suzie A.
"Normative Evaluation of a Letter Cancellation Instrument for the Assessment of Sustained Attention: A Construct Validation Study,"
The Journal of Undergraduate Research: Vol. 2
, Article 4.
Available at: http://openprairie.sdstate.edu/jur/vol2/iss1/4