The relationship between extent of aftereffect and speed of a rotated spiral
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Abstract
The purpose of the present study was twofold. First, a new technique for assessing the extent of the spiral aftereffect was utilized; and second, one parameter of the spiral, speed of rotation, was systematically examined. The recent literature on the spiral has consisted of establishing the diagnostic ability of the instrument for organic subjects. Examination of the parameters of the instrument itself has been limited by the lack of an adequate technique for assessing the extent of the aftereffect.
None of the extant theories were capable of predicting either the direction, of expansion or contraction, or the function of speed on the aftereffect. A post hoc explanation was offered to explain the effect of speed on spiral aftermovement by an extension of the statistical summation theory. The following prediction was based on pilot data with the intent to determine if speed was a stable general function of the after effect:
As spiral rotation speed increases from zero to fusion, the aftereffect will first increase and then decrease. [TRUNCATED]
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Thesis (Ph.D.)--Boston University
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