The hand model of the brain, adapted from Dan Siegel and Mary Hartzell’s “Parenting from the Inside Out,” explains how different parts of the brain are represented by the fingers: Thumb (Limbic Regions): Contains the Hippocampus and Amygdala, which act as the brain’s safety alarm system.

When stressed, this part can shut down the Prefrontal Cortex.

• Your fingernails (Prefrontal Cortex): Responsible for processing and storing emotions and memories, as well as higher functions like decision-making and self-awareness.
• Your fingers (Cerebral Cortex): Manages perception, motor actions, speech, and rational thinking.
• Your wrist  (Brainstem): Oversees survival instincts, automatic functions, and reflexes.

When overwhelmed, stressed, or facing trauma, one can “flip their lid,” losing access to the Prefrontal Cortex and operating from a highly emotional state. It is crucial to remain calm to help regulate the child or person who has “flipped their lid.” This model emphasizes the importance of the Prefrontal Cortex for rational and adaptive responses, versus reactive and impulsive reactions when this part is shut down. Remember the key point: If someone has “flipped their lid,” especially a child, staying calm is essential, as getting agitated will not help them access their Prefrontal Cortex for optimal processing and decision-making

Brain in Palm of Hand handout