What is the theme in I felt a Funeral, in my Brain by Emily Dickinson?

Doubt and uncertainty are another theme in this poem. WhileDickinson's poem can be read as a description of its speaker's mental collapse, this is not the only valid interpretation. Indeed, "I felt a Funeral, in my Brain" can also be read as a depiction of an individual's complete loss of religious faith. In this light, the funeral described is not one for the speaker's sanity but for those religious or spiritual assumptions previously embraced by her. While the cause of such a loss is never mentioned, the effects of it are described as devastating.