Biomedical subjects

K K Shieh

Publications and source records attributed to K K Shieh.

6 recordsLinked to original sources

PubMed1999

A quantitative model for designing keyboard layout.

This study analyzed the quantitative relationship between keytapping times and ergonomic principles in typewriting skills. Keytapping times and key-operating characteristics of a female subject typing on the Qwerty and Dvorak keyboards for six weeks each were collected and analyzed. The results showed that characteristics of the typed material and the movements of hands and fingers were significantly related to keytapping times. The most significant factors affecting keytapping times were association frequency between letters, consecutive use of the same hand or finger, and the finger used. A regression equation for relating keytapping times to ergonomic principles was fitted to the data. Finally, a protocol for design of computerized keyboard layout based on the regression equation was proposed.

Adult↗

PubMed1998

Effectiveness of redundant color coding in multidimensional identification.

This study investigated the effectiveness of redundant color coding in multidimensional identification. Statistical analysis showed that redundant color in multidimensional identification did not necessarily improve performance and response speed might even deteriorate if subjects were not informed of the use of redundant color. Merely informing subjects of the use of redundant color might not benefit identification speed either; subjects had to actually use color in responding to facilitate response speed. Further, redundant color might be more appropriate to associate with the less-salient or the less-familiar stimulus attribute. Implications of the results for the design of multidimensional display and for human information processing were discussed.

Adult↗

PubMed1997

Multidimensional stimulus identification: instructing subjects in the order of reporting stimulus dimensions.

Two experiments were conducted to investigate the effects of order of report on identification of multidimensional stimuli under various experimental conditions. Statistical analysis showed that order of report affected speed of identification. Subjects responded faster if a natural and more appropriate way of reporting stimulus dimensions was used. Further, subjects reacted more slowly if they were free to report stimulus dimensions in any order than when they were forced to report in a particular order. Their performance was even worse when order of report was a with-in-subject factor. Response competition and response inhibition were proposed as possible explanations of the results. The implications of the results for multidimensional identification tasks are to designate an appropriate order of reporting stimulus dimensions and to instruct subjects to respond in that order.

Adult↗

PubMed1997

Effects of duration of stimulus and variability of foreperiod on the identification of multidimensional stimuli.

Two experiments were conducted to investigate the effects of duration of stimulus and variability of foreperiod on the identification of multidimensional stimuli. Statistical analysis showed that performance speed and accuracy deteriorated as duration of stimulus was severely limited. Further, subjects seemed to change the allocation of attentional resources according to the attributes of stimulus. They tended to distribute more attentional resources to the less salient attribute which resulted in a statistically nonsignificant effect of order of report under time stress. Variability of foreperiod had very little effect on performance and may not be important to consider in reactions. Implications of these results for the design of multidimensional displays and for human information processing were discussed.

Adult↗

PubMed1996

Effects of report order, identification method, and stimulus characteristics on multidimensional stimulus identification.

An experiment was conducted to investigate the effect of order of report, identification method, redundant color coding, and stimulus location under dual task conditions on multidimensional stimulus-identification performance. Analysis showed that order of report and identification method did affect speed and accuracy of identification. Subjects reacted faster and more accurately if this order of reporting stimulus-dimension values was appropriate. Physical identification was also faster and more accurate than identification of meaning, but there was no effect for redundant color coding, stimulus location, and difficulty of the dual task on identification. The implications of the results for design of visual displays were discussed.

Adult↗

PubMed1996

Effects of practice on identification of multidimensional stimuli.

This study investigated the effects of practice on the identification of multidimensional stimuli. Subjects were instructed to perform a two dimensional identification task. The stimuli could be identified either physically or connotatively. There were two orders of reporting the two dimensions of a stimulus. Analysis showed that method of identification and order of report significantly affected speed of identification. Physical identification was faster than identification of meaning. An appropriate order of report shortened response times, and increased practice reduced response times. Practice in multidimensional identification seemed to follow the same laws and trends of unidimensional performance. The effects of practice on multimensional identification could be represented by straight lines if response times were plotted against the logarithm of the number of trials as noted in unidimensional performance. Further, practice attenuated initial differences in response times between physical identification and identification of meaning.

Adult↗