Christopher R. Westphal

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We determined the reproducibility of both the direction and the effect size of the word frequency effect (WFE) as it relates to associative semantic judgments. Sixteen volunteers were scanned twice. At the group level of analysis, signal change and voxel counting could both reproducibly detect the existence of a WFE. However, signal change data showed less(More)
Printed word frequency can modulate retrieval effort in a task requiring associative semantic judgment. Event-related fMRI, while avoiding stimulus order predictability, is in theory statistically less powerful than block designs. We compared one event-related and two block designs that evaluated the same semantic judgment task and found that similar brain(More)
Event-related fMRI was used to evaluate the effect of printed word frequency on the subsequent recognition of words incidentally encoded while 16 healthy right-handed volunteers performed living/nonliving judgments. Semantic judgment took longer for low-frequency words. These words were more accurately recognized than high-frequency words at later testing.(More)
<b>Building Expert Systems: Cognitive Emulation</b> provides a good thorough overview of cognitive emulation and its relation to knowledge engineering techniques. Cognitive emulation as defined by Slatter refers to <i>the strategy of expert system design that attempts to emulate human thinking.</i> Although cognitive emulation appears to be inherent in(More)
  • C. Westphal
  • Archiv für Psychiatrie und Nervenkrankheiten
  • 2007
D e r nachstebend berichtete Fall ist, so viel mir bekannt, das erste Beispiel yon Combination einer strangfOrmigen Erkrankung der Hinterstrfinge mit einer multiplen (fleckweisen), alle }Iarkstriinge und die graue Substanz in unregehn~issiger Wcise ergreifenden Degeneration. Dass bei der gewtihnlichen fleckweisen Degeneration (Scldrose en plaques(More)
r'e ¢=1"~ --h~,,~ t l~ < ~,~ 0 ~ ~") ~ ~ ~ t e e ' h T 3 b'~ ~ " ~ 0 0 ' h . l~ 0 0 ~ " --h ~ ~ ~ < 0 ~ ~== ~ ~ ~ o = ~ , ~ " = ~ = ® = o ~ ~ ~ ~ , . ~ ~ ~ ~ o ~ ~ " ~ ~ fD fl) 0 ~.~ ---I ~ ~ ¢3) (D "~ ~ f l) O "~ ~D ~D 3::~ "O .~ ~ c e t Q , . O ~ r l . . O ~ ~ ~ ~ _rl ~ "$ ~ ~ ~ " I~ ~ " I~.: Q.. ~J < fD C~, .~ " h m ~ --~ ~ ~ = r ' ~ ~ (O ~ ~ ~ ' h ~(More)
At!uaQXa KASH (Knowledge Acquisition =ell) is proposed to assist a knowledge engineer by providing a set of utilities for constructing knowledge acquisition sessions based on interviewing techniques. The information elicited from domain experts during the sessions will be guided by a question dependency graph (QDG). The QDG, defined by the knowledge(More)
  • C. Westphal
  • Archiv für pathologische Anatomie und Physiologie…
  • 2005
In den siimmtlichen mitgethei-lten und zur Autopsie gekommenen 13 Krankheitsf~illen paraIytischen Irrsinns liess sich, wie die Untersuchung nach dem Tode zeigte, eine Affection des Riickenmarks nachweiseo. Ebenso verhielt es sich mit 4 in frtlheren Arbeiten untersuchten F~illen, so dass uns 17 Beobachtungen yon paralytischem Irrsinn mit gleichzeitiger(More)
As more (and more) knowledge-based systems are designed for operational use, it becomes apparent that the knowledge engineering (KE) process of transferring domain expertise into the system consumes the single largest block of development time (Feigenbaum, 1977; Hayes-Roth, Waterman, &amp;amp; Lenat, 1983). To reduce the time required for this stage,(More)