The subject refers to an individual's personal mental and emotional activity, while the object refers to collectively shared descriptions of physical events and interactions.
In the essay What is it like to be a bat?, Thomas Nagel famously argued that explaining subjective experience -- the "what it is like" to be something -- is currently beyond the reach of scientific inquiry, because scientific understanding by definition requires an objective perspective, which, according to Nagel, is diametrically opposed to the subjective first-person point of view.
Example: (The Causal Efficacy of the Subject)
Significant changes in physiology were noted when participants were asked to focus their attention on a specific emotional feeling, such as care, appreciation, or compassion. It was discovered that by deliberately altering ones emotional (subjective) state and sustaining it, changes could be affected at the neuro-/biochemical (objective) level that cascaded down into changes in behavior (objective).