![]() ![]() Some authors define this spiral as the combination of the curves r and. The shape had actually been described a few years earlier by his friend Conon of Samos (280220 BC), a Greek astronomer who named the star constellation Coma Berenices. Finally, Receiver Operating Characteristic (ROC) curves analysis shown that the method classified the spirals better than human ratters. The Archimedes spiral (or spiral of Archimedes) is a kind of Archimedean spiral. This study is an evaluation of the Archimedes spiral as a clinical technique for the diagnosis of organic brain damage. This spiral is named after the Greek polymath Archimedes (287212 BC), having appeared in his 225 BC essay On Spirals. Archimede’s Spiral For a 1, so r 1/, we get the reciprocal (or hyperbolic) spiral. For example if a 1, so r, then it is called Archimedes’ Spiral. There was also a high linear correlation between them and the clinical score given by three neurologists. Archimedean Spirals An Archimedean Spiral is a curve dened by a polar equation of the form r a, with special names being given for certain values of a. The experimental variables were greater in the patients group respect to age-matched controls. Its results were interpreted with the aid of a computer model of a tremulous spiral. ![]() Finally, the reconstructed spiral was analysed using the Fourier Transform. The Archimedean spiral (also known as the arithmetic spiral) is a spiral named after the 3rd-century BC Greek mathematician. Secondly, the mean and the standard deviation of the distance between each point of the spiral drawing and the corresponding point of the spiral model were determined. The spirals were first analysed by means of the cross-correlation coefficient with the spiral template. Specimens were scanned and then treated through a semiautomatic computer program that reconstructs the temporal sequence of the spiral drawing by the subject. Thirty-one patients with action tremor and 24 control subjects were asked to draw an Archimedes spiral over a print template. We have developed a new quantitative analysis of spiral drawing that is able to evaluate any spiral execution and it has not temporal or spatial limitations in the obtaining of specimens.
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