"When they're viewing these pictures of their grandchild, they're really feeling what the grandchild is feeling. So, when the child is expressing joy, they're feeling that joy. When the children are expressing distress, they're feeling that distress." Evidence supporting the hypothesis has been found in societies including Hadza hunter-gatherers of northern Tanzania, where grandmothers provide nourishing tubers to their grandchildren. Grandmothers who reported a greater desire to be involved with caring had greater activity in brain regions of interest.

Source: Manila Times November 17, 2021 23:00 UTC