The effects of system response time and cognitive loading on accessing an automated telephone emergency service: examining elderly and young users
<p>The user interface for a proposed alternative emergency service was conceived and designed for a standard touch-tone telephone. The service would allow a user to activate an automated, pre-recorded message containing information to aid emergency responders. The user must only press a few sp...
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| Format: | Others |
| Language: | en |
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Virginia Tech
2014
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| Online Access: | http://hdl.handle.net/10919/43171 http://scholar.lib.vt.edu/theses/available/etd-06112009-063605/ |
| Summary: | <p>The user interface for a proposed alternative emergency service was conceived
and designed for a standard touch-tone telephone. The service would allow a user to
activate an automated, pre-recorded message containing information to aid emergency
responders. The user must only press a few specified keys on the telephone key-pad,
avoiding the need for verbal interaction with a dispatcher.</p>
<p>
The interface was designed in terms of providing the necessary instructions for
activation and considering various input strategies and feedback. Icons, written
instructions, and voice feedback were employed in the development of a successful and
effective interface between the user and the system.</p>
<p>
Because the system is expected to attract elderly users and families with young
children, the performance and attitudes of these two age groups in regard to a system
prototype were examined to determine if the interface was suitable.</p>
<p>
A two and eight second initial system response time were imposed upon users to
determine any effect these delays might have on user response time, error rate, and
subjective attitudes. Additionally, a secondary task, designed to increase cognitive
loading was employed to determine if the system is usable while the user is engaged in a dual-task environment. The dependent variables used to gauge the effects of the
manipulated variables include the objective measures of user response time and error rate
and subjective questionnaire responses.</p>
<p>The results of the study indicate that the elderly adults and young children were
able to activate the system successfully. System response time and cognitive loading had
no significant effect on user performance or subjective attitudes. Distinct practice effects
were observed. Attitude scales indicated satisfaction with the service and its interface.
Finally, a significant effect of age was observed on average user response time, with the
elderly activating the system quicker than the children.</p> === Master of Science |
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