The relationship between working memory and emotion
Working memory and other aspects of executive function (attention, for instance) are linked. There is evidence that improving self control improves emotional outbursts (see article below).  So, improving working memory should improve self control, which should prevent emotional outbursts.   

See: Denson, T. F., Capper, M. M., Oaten, M., Friese, M., &amp; Schofield, T. P. (2011). Self-control training decreases aggression in response to provocation in aggressive individuals. Journal of Research in Personality, 45(2), 252–256. doi:10.1016/j.jrp.2011.02.001