Right and left-handedness in humans IELTS READING
READING PASSAGE 1 - Right and left-handedness in humans IELTS READING You should spend about 20 minutes on Questions 1-12 which are based on Reading Passage 1 below. Why do humans, virtually alone among all animal species, display a distinct left or right-handedness? Not even our closest relatives among the apes possess such decided lateral asymmetry, as psychologists call it. Yet about 90 percent of every human population that has ever lived appears to have been right-handed. Professor Bryan Turner at Deakin University has studied the research literature on left-handedness and found that handedness goes with sidedness. So, nine out of ten people are right-handed and eight are right-footed. He noted that this distinctive asymmetry in the human population is itself systematic. “Humans think in categories: black and white, up and down, left and right. It’s a system of signs that enables us to categorize phenomena that are essentially ambiguous.’ Research has s...