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Individual Project Page 2 Charles Spearman proposed his theory as justification for the current conception of intelligence as a single entity that could be scientifically represented by a global measure He noticed that diverse measures of performance tend to be highly correlated thus performance appeared to be dictated by one general characteristic with the presence of task specific factors to explain less than absolute correlations between testsRogers318-20 Consequently Spearmans Two-Factor theory described intellectual performance as a combination of general intelligence g which is present in differing degrees in all individuals and those specific factors s which vary in their strength and influence upon intellectual tasksFancher92-3 yet he clearly stated that g was merely a magnitude and not a representation of concrete realityEdwards108 Moreover the universal nature of g was applicable only to human cognitions and ability and not to the influences of affect and motivation as later researchers would postulateEdwards110 Spearman also characterized general intelligence as mental energy a theoretical paradigm whereby s represents neural networks as mental engines that enable the expression of g as energyEdwards110 a system in which continual competition for mental resources is indicated by the continuity of psychological functioningRogers320 Hierarchical ordering of a matrix of the intercorrelations between various test scores was considered to be proof for the existence of general intelligence in that it could be arranged in descending order according to the saturation of g in the test which varies as a function of the task involvedsee Rogers320 Spearman postulated the theorum of the indifference of the indicator which states that any measure of human performance is an appropriate estimate of Intelligence if both s and g have been well establishedRogers322 in this manner all aspects of Intellectual performance could serve as a measure of g which virtually eliminated the debate as Individual Project Page 3 to what tasks a test should properly
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