Table 1.

Example stimuli

	Operand sign
Operation	Positive		Negative
Foil distance	Close	Far	Close	Far
Addition	3 + 5 = 8 <> 10	3 + 5 = 8 <> 3	−3 + −5 = −8 <> −10	−3 + −5 = −8 <> −3
Subtraction	5 – 3 = 2 <> 1	5 – 3 = 2 <> 8	−5 − −3 = −2 <> −1	−5 – −3 = −2 <> −8
Control	& + ! = @ <> $	& + ! = @ <> %	−& + −! = −@ <> −$	−& + −! = −@ <> −%