Our perceptual system can identify an image or a word after viewing it just a few seconds and even if it is a little masked (made less identifiable at a conscious level).
Even when there is no conscious awareness, mechanisms and adaptation processes are activated automatically.
You can objectively identify that there has been an activation of the stress axis (tachycardia, muscular activation, changes in breathing, release of adrenalin, cortisol and other neurotransmitters etc.) after stimulus from the RePro App via HRV (heart rate variability), vagal tone and biomarker measurement tools to name just a few.
In addition to this, specific brain areas are activated depending on the type of stimulus shown (for example nurture circuits when the image shows an unhappy child, social regulation circuits when there is an aggressive person pictured, fear circuits when shown a spider in case of phobia etc.)