The feasibility of providing a spelling corrector as a part of interactive user interfaces is demonstrated. The issues involved in using spelling correction in a user interface are examined, and a simple correction algorithm is described. The results of an experiment in which the corrector is incorporated into a heavily used interactive program are described. More than one quarter of the errors made by users during the experiment were corrected using the simple mechanisms presented here. From this we have concluded that there are considerable benefits and few obstacles to providing a spelling corrector in almost any interactive user interface.
This paper reports a simple low-cost computer peripheral for generation of gratings. Its advantages are minimal CPU operations, reliability, and variety of programmable output functions. The luminance gratings used in the study of human spatial and temporal vision can be generated in several ways. These include optical techniques (Antis & Comerford, 1975) and electronic waveform generators for the Y-axis and Z-axis (e.g., Fischer, 1976; Hughes & Snow, 1973; Shapley & Rossetto, 1976; Stamps & Bourne, 1972), coupled to a TV raster or cathode-ray oscilloscope (CRO) with a time base for the X-axis. Either analog (Rogers, 1976) or digital (Brown, 1977) techniques can be used to provide moving gratings. All the latter methods are related to the original technique described by Campbell and Green (1965). In addition, a microprocessor could be used as a scheduling device for switching peripheral generators (Keemink, van der Wildt, & Van Deursen, 1979). An alternative is to calculate the appropriate waveform for the Z-modulation profiles. Further, stimulus parameters can be preprogrammed. A microcomputerbased system reported by Fritsch and Keck (1978) uses the sequential digital-to-analog (0/A) output of a pre
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