Sound, Speech, and the Emotional Brain: The Neuroplasticity of Dhikr 1. The Limbic System and the Power of Emotional Sound The human brain is not only a thinking machine — it is, first and foremost, a feeling organ. At the core of our brain lies the limbic system , the seat of our emotions, memories, and instinctive responses. This part of the brain governs our emotional reactions and is deeply responsive to sound , intonation , and rhythmic speech . When we engage in dhikr — the repetition of divine names or sacred phrases — we are not simply articulating words. We are communicating directly with the emotional brain . The rhythm, tone, and cadence of dhikr bypass the analytical prefrontal cortex and move straight into the limbic system, activating emotional memory, calming the amygdala, and inducing a sense of safety, resonance, and peace. Neuroscience has shown that sound, particularly human speech with emotional significance , can alter emotional states rapidly — even befo...