In multi-attribute decision making, the presence of the attraction effect or compro-<br>mise effect is considered a form of irrational choice because these effects violate the<br> principles of rational choice. These two context effects are similar in that they increase<br> the choice share of a particular option, but the mechanisms by which they occur are<br> believed to differ, owing to the different trade-off structures of the choice sets concerned.<br> Previous studies have indicated that negative emotions and the strategies employed in<br> decision making differ between the two context effects and that these effects correspond<br> to Systems 1 and 2 of the dual process theory. In this study, focusing on trade-offs, we<br> examined the mechanisms by which these two context effects occur, by experimentally<br> manipulating cognitive resources and measuring negative emotion and eye movement<br> in decision making. We attempted to increase and decrease these resources by using a<br> glucose drink and a cognitive depletion task, respectively. Results showed that the at-<br>traction effect increased and the compromise effect decreased in subjects with depleted<br> cognitive resources compared to subjects with restored cognitive resources. Negative<br> emotions were strongly aroused in the compromise effect. Eye tracking data showed<br> that a non-compensatory decision strategy was used in the attraction effect context and<br> that a compensatory decision strategy was used in the compromise effect. These find-<br>ings suggest that reasoning systems and decision strategies are directed by differences<br> in the trade-off structure of the choice sets, which ultimately lead to the occurrence of<br> the above two context effects.