Table 1.

Normed materials used in the experiment.

Hierarchy of class concept	Materials
Superordinate level	Animal, plant
Basic level	fruit, vegetable, tree, grass, flower, bird, insect, cat, dog, pig, snake, rabbit, fish, tortoise, frog, monkey, cattle, bear, mouse, and tiger
Subordinate level	Bird: swallow, magpie, sparrow, oriole, kingfisher, tit, crow, wild geese, pigeon, and lark
	Insect: cockroach, ladybug, cricket, grasshopper, beetle, butterfly, bee, dragonfly, fly, and locust
	Fruit: apple, orange, pear, peach, watermelon, banana, pineapple, tangerine, grape, and strawberry
	Vegetable: cabbage, green vegetable, spinach, radish, cauliflower, eggplant, cucumber, lettuce, pepper, and leeks
	Non-life: chair, sofa, bookcase, stool, bureau, tea table, dining table, mattress, desk, kettle, air-condition, fan, loudspeaker, computer, camera, refrigerator, eraser, schoolbag, pencil, pen, glue, chalk, scissor, blackboard, knife, ink, ruler, cap, shoe, trousers, socks, shirt, skirt, scarf, sweater, car, train, steamship, plane, and passenger car

Note The non-life categorisation is used as a control condition.