what similar patterns emerged in the groups of musicians- both violinists and planists- that psychologist K. Anders Ericsson and his collegues studied?

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https://www.gradesaver.com/outliers/q-and-a/what-did-psychologist-k-anders-ericsson-discover-about-the-most-successful-violinists-333007

what similar patterns emerged in the groups of musicians- both violinists and planists- that psychologist K. Anders Ericsson and his colleagues studied? Use several examples of evidence from the text to support your answer.