Whether your response to stimuli is written or oral, it follows basically the same format: an introduction which hooks the audience or reader and states your thesis, the main part which gives arguments to support your thesis, collaborated by evidence and examples, and a summary or conclusion to your response.
Of course, a speech is a different mode of delivery to an essay, so its format will be tweeked to engage the audience in different ways.
Structure of Oral Presesentation – Analytical (Penn University)
Writing an analytical essay (WikiHow)
Analytical essay (easy)