Charitable giving, volunteering, climate-friendly choices, and most recently changing one's lifestyle to stop the spread of the coronavirus are all examples of prosocial behavior. Prosociality can be investigated from different perspectives including the "who-question" (which people are more likely to help), and the "when-question" (which situational factors stimulate helping?), but in this article we focus primarily on the "why-question" (which emotions and cognitions motivate

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... ally, this article tries to organize and synthesize literature related to emotions, thoughts, and beliefs (i.e. psychological mechanisms) that motivate or demotivate human helping behavior. To do this, we present a new typology including four overarching interrelated categories, each encompassing multiple subcategories.(1) Emotions: (a) emotional reactions elicited by the need situation such as empathic concern/sympathy, (b) positive or negative attitudes toward the beneficiary or the requester, (c) incidental mood. (2) Moral principles: (a) personal responsibility, (b) fairness-concerns, (c) aversion towards causing harm. (3) Anticipated impact: (a) self-efficacy (e.g. "can I make a difference?") and (b) response-efficacy (e.g., "is this cause/project efficient and worthwhile?"). (4) Anticipated personal consequences: (a) material, (b) social and (c) emotional costs and benefits that the helper expects will follow if she helps or if she does not help. Increased knowledge about the "who" (e.g. individual differences in demography or personality) and "when" (situational antecedents such as characteristic of those in need, or type of solicitation) can surely help predict and even increase prosociality, but we argue that to understand the psychology of helping we need to also consider the psychological mechanisms underlying prosocial decisions (the "why-question").We compare our typology against related theoretical frameworks, and present the pros and cons with different methodological approaches of testing psychological mechanisms of helping, with the aim to help researchers and practitioners better organize and understand the many psychological factors that influence prosocial decisions.