The reptilian brain (called such because it is made up of the main structures in a reptile’s brain: the brainstem and cerebellum) is the most primitive part of our brain and, in evolutionary terms, it is the oldest part of our brain. It is responsible for instinctive behaviours such as heart rate, temperature, balance, territoriality, mating, feeding and involuntary reflexes such as swallowing, sneezing and gagging. The reptilian brain is reliable but tends to be somewhat rigid and compulsive.The BrainBox. (n.d.). Triune Brain Theory. [online] Available at: http://www.thebrainbox.org.uk/triune_brain_theory/triune_brain_theory.html [Accessed 15 Nov. 2018]. Siim Land. (n.d.). How Your Reptilian Brain Controls Your Behavior. [online] Available at: http://siimland.com/how-your-reptilian-brain-controls-your-behavior/ [Accessed 15 Nov. 2018]. Queensland Brain Institute. (n.d.). The Hindbrain. [online] Available at: https://qbi.uq.edu.au/brain/brain-anatomy/hindbrain [Accessed 19 Nov. 2018]. Baars, B. and Gage, N. (2010). Cognition, Brain, and Consciousness. 2nd ed. Academic Press.