Does learned helplessness contribute to our understanding of depression today?

Essay to be written approximately 2200 words:
Dogs exposed to inescapable electric shocks in one situation later failed to learn to escape shock when given the opportunity to do so. This observation was explained as learned helplessness. What changes were made to the original explanation of learned helplessness in animals in order to account for human depression? Does learned helplessness contribute to our understanding of depression today?

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