As a field expert in neuroscience, I can provide an informed perspective on this question. The brain is a vital organ responsible for controlling all bodily functions, including those that sustain life such as breathing and heart rate. However, the term "without a brain" can be misleading because it doesn't specify which parts of the brain are absent or non-functional. Hydranencephaly is a rare condition where a significant portion of the brain, particularly the cerebral cortex, is missing. Despite the absence of the cerebral cortex, some individuals with this condition can survive because the brain stem, which controls basic life functions, may still be partially functional. The brain stem is crucial for life as it regulates autonomic functions like breathing, heart rate, and the sleep-wake cycle. It's important to note that survival without a significant part of the brain does not equate to a normal life. Individuals with hydranencephaly typically have severe developmental and cognitive impairments. The survival of someone like Kaliysha, who has hydranencephaly, is indeed remarkable and defies the initial expectations of medical professionals. However, it is not a common outcome, and the quality of life for such individuals is significantly impacted. read more >>

2. Kaliysha, was born with hydranencephaly, a rare condition that left her without a brain. Despite doctor's dismal expectations, Kaliysha is now 6 years old and has managed to survive with only a partially functioning brain stem. Originally Answered: Can a human live without a brain?read more >>