The hypothalamus is one of the most important parts of the brain, involved in many kinds of motivation, among other functions. The hypothalamus controls the “Four F’s”:
1. fighting;    – kaušanās
2. fleeing;    – bēgšana
3. feeding;    – barošanās
4. mating.

- NeuroPsychology professor

Sākumā nesapratu, kas tas par ceturto "F". Kad pielēca.. :) Mating - draudzēties. To vārdu zina visi, tas ir angliski un sākas ar f, tam ir četri burti.