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Recent work in perception, learning and cognition has uncovered substantial evidence for a unifying information-processing mechanism, known as 'chunking'. Such a mechanism was initially proposed by De Groot 1,2 , based on studies of problem solving, and by Miller 3 , based on studies of perception and memory. Miller's key contribution was to propose an(More)
One of the most disconcertingly unnatural properties of most virtual environments (VEs) is the ability of the user to pass through objects. I hypothesize that passive haptics, augmenting a high-fidelity visual virtual environment with low-fidelity physical objects, will markedly improve both sense of presence and spatial knowledge training transfer. The(More)
A model of the processes involved in the graphical production of chunks form memory is proposed. The primary processing constraints of the model are (a) serial processing (b) over a hierarchical structure of chunks (c) in a depth first manner. The model makes predictions about the relative durations of each individual pause that occurs between successive(More)
ii Captain Toolbox CAPTAIN is a MATLAB ® compatible toolbox for non stationary time series analysis, system identification, signal processing and forecasting, using unobserved components models, time variable parameter models, state dependent parameter models and multiple input transfer function models. CAPTAIN also includes functions for true digital(More)
Graphical protocol analysis (GPA) is a novel method for studying chunk-based cognitive performance using semi-automated analysis of a temporal chunk signal in writing protocols. This study applies GPA to the writing of mathematical equations by participants with different levels of expertise. Multiple levels of competence can be distinguished on a single(More)
Writing may be an effective approach to the study of cognitive phenomena that involve the processing of chunks. This paper provides evidence for the existence of a substantial and robust temporal signal in the process of writing that reveals information about the structure of chunks in working memory. Specifically, it is demonstrated that in the writing of(More)
Previous research on the temporal chunk signal has focused on the use of pauses in behaviour to probe chunk structures in working memory. On the basis of some of these studies, a hierarchical process model has been proposed, which consist of four hierarchical levels describing different kind of pauses. In this model, the lowest level consists of pauses(More)
This research focused on the fluency of writing processes of children with dyslexia, in order to examine the relationship between WM and writing. An experiment was used in which children with dyslexia, and chronological age-matched and reading age-matched children without dyslexia wrote 24 sentences. Sentences with existing words and non-words were used.(More)
The effect of chunking in the process of drawing was investigated using a task domain consisting of simple hierarchically organized geometrical patterns, which participants learnt to draw. The study focused upon the latencies between drawing actions. A new technique for the identification of chunks was devised, based on patterns in the magnitudes of(More)
The authors report at adult age 7 patients (6 men, one woman) with the syndrome of "acquired aphasia-epilepsy", 6 of which had been previously studied as children. The results of the language, neuropsychological and socio-educational evaluation detailed many years after the onset of the aphasia are the subject of this report. One man has recovered(More)