Does this picture show the first MRI that captures the brain activity of a mother kissing their child? Additional text used: “Her kiss has caused a chemical reaction in her baby’s brain that generated a burst of oxytocin – a hormone that generates feelings of attachment and affection.”

This is not true. The original MRI by Rebecca Saxe and Atsushi Takahashi does not show brain activity (the colored parts). That would be impossible via MRI. The colored parts have been added. The background story is made up.
See the original image and read Rebecca Saxe’s article: Why I Captured This MRI of a Mother and Child