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Geometric motifs and symbols of ancient rock art, cave paintings and rock engravings such as the spiral found at Brú na Bóinne, and the kerbstones of Newgrange, Knowth and Dowth, in relation to the anatomical and neurophysiological characteristics of the human visual cortex. This neurophysiological approach will test the 'universality' hypothesis, and universals, and introduce the concept of 'neuro-aesthetics'. Comparing Irish megalithic motifs and hallucinations.