“Even when” functions in constructing contrasts by introducing a scenario where an expected outcome or situation may not occur. This conjunction helps emphasize exceptions or contrasting points in a sentence by setting up a situation that goes against what would typically be expected. Its effect on highlighting differences or contradictions in situations or conditions is to draw attention to specific instances that deviate from the norm.

For example, in the sentence “Even when it rains, she still goes for a run,” the use of “even when” signals that the act of going for a run is not typical behavior when it is raining. This contrast underscores the determination or dedication of the person to their routine despite adverse conditions.

In essence, “even when” serves to underline exceptional circumstances or behaviors that stand out from the norm, thereby emphasizing contrasts and drawing attention to deviations from expectations.