Mia, aged 12, has practised the piano every day for a year. At first her playing was slow and clumsy, but it is now fast and smooth. Over the same year she stopped practising the French she learned at primary school, and she has forgotten most of it.
Using your knowledge of brain development, explain the changes described in the source.
30 exam-style questions on OCR GCSE Psychology 2.1 Key Concepts, covering 2.1.1 Stages of development, 2.1.2 Brain development and the nervous system, and 2.1.3 IQ tests as a measure of intelligence. Each one has a worked solution and a mark scheme showing where the marks go.