Forebrain, the evolutionary addition for reflective thought

junyabee: There's a different utility in play when being cognizant of a thought than when being cognizant of an observed occurring act.

Since we've become more sedentary creatures who have less need for kinetic physical action from our muscles [people in martial arms and athletic activity being the exceptions] the physiological archives that serve our optical senses become the 'RAM' for those received signals. Yet most kinetic actions are less than five seconds and involve the acute amplitudes of received signals.
Those signals that reach that level of amplitude will be stored in the optical RAM that holds the graphic images.

When we are taking in more abstract thoughts for which a cognizant 'picture' needs to be composed for a visualized comprehension, other storage parts of the brain are called upon to assemble a collation that may be 'uploaded' to the optical RAM archives for 'visualizing'. Unlike the former process in which the acute amplitude of signal energy is from physical objects dynamic position changes in time, the latter process involves the construction of fiat objects from the brain's warehouse of conceived props to compose the surrogates for what the optical senses would be signaled directly. The fore-brain is the spatial addition of neurons and synapses to accomplish this process.

Unlike storage to the RAM of the optical sensory centers for which the adrenalinized energy is the tool of placement. A more continual flow of energy is needed for the surrogate composition of a fiat object to serve the function that a tactile object serves in a primary optically signaled communication. This would use the reserves in the blood than those provided by hormonal boost when observing tactile object movements.

junyabee:
The learned, collated, and associated patterns stored in the fore-brain provide the abstract visualization of fiat concepts in intangible form. For that reason the reflective processes of the fore-brain would induce a slightly more delayed and emotionally detached reaction to an abstract concept than the more 'trigger-like' precipitated actions from the direct observation of the kinetic effects on physical spatial objects.