Table 1.

Object pairs used in the reinforcement learning task

Pair	Object descriptions	Object numbers
1	Pen, pencil	167, 168
2	Glasses, book	105, 30
3	Chair, table	53, 226
4	Candle, light bulb	44, 138
5	Key, door	128, 76
6	Tree, flower	241, 91
7	Belt, pants	26, 162
8	Carrot, onion	48, 157
9	Apple, pear	6, 166
10	Cat, dog	49, 73
11	Car, bus	47, 39
12	Lamp, light switch	132, 139
13	Water glass, wine glass	104, 258
14	Shoe, socks	204, 211
15	Telephone, television	227, 228
16	Moon, sun	146, 222
17	Pot, pan	179, 101
18	Fork, spoon	97, 215