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T W Frazier

Publications and source records attributed to T W Frazier.

8 recordsLinked to original sources
PubMed2001

Comparability of the Rey and Mack forms of the Complex Figure Test.

Equivalent versions of the Complex Figure Test (CFT) are useful for assessing change over time in constructional skills, planning, spatial organization, and visual-spatial memory while minimizing practice effects. To address the need for an equivalent version of the CFT to the Rey, the present study compared copy and 45 min-delayed recall accuracy scores of the Rey and Mack CFTs obtained from 245 adults involved in a study of the neuropsychological correlates of sleep apnea and its treatment. Accuracy scores did not significantly differ between individuals with and without sleep apnea. Also, there was no significant difference between copy or recall accuracy scores obtained on the Rey and Mack CFTs. Similar correlations were found between relevant demographic factors, estimated IQ, and accuracy scores for both CFTs. These data suggest that the Mack figure may be a useful alternative to the Rey CFT.

Adult↗
PubMed1969

Control of human vigilance by concurrent schedules.

Twenty four subjects were studied for ten 1-hr sessions to determine whether the human observer's visual monitoring of individual meters in a complex display can be differentially controlled by concurrent scheduling of signals. Subjects were divided into two main groups of 12 each. One group was given fixed-interval, variable-interval, and differential-reinforcement-of-low-rates schedules. The second group was given fixed-interval, fixed-ratio, and differential-reinforcement-of-low-rates schedules. Test subjects were instructed only to detect as many signals as possible. Results indicated that observing responses to the individual meters corresponded to the temporal patterns known to be associated with the schedules for the group given fixed-ratio instead of variable-interval as a component schedule. The group given the variable-interval schedule in the three-schedule combination tended to exhibit the same pattern of viewing across each of the three meters during any given session. However, subsequent testing was performed on two more subjects over 64 sessions, by adding initial feedback of signal detection results, and instructions concerning schedule construction. These results indicated that with knowledge of schedule construction and initial feedback of detection data, differentiated responding can be maintained efficiently over long periods of time by the combination including fixed-interval, variable-interval, and differential-reinforcement-of-low-rates schedules.

Attention↗