Which structure is primarily responsible for forming new memories and spatial navigation?

• A. Thalamus
• B. Hypothalamus
• C. Hippocampus
• D. Amygdala

Answer: (C)

The hippocampus is the brain region most essential for forming new memories and for guiding spatial navigation. It binds diverse elements of experiences—what you saw, heard, and felt—into cohesive episodic memories and supports the creation of a cognitive map of the environment. In navigation, hippocampal place cells fire when you’re in specific locations, helping you build and use a spatial representation of your surroundings. It receives processed sensory input from the entorhinal cortex and works with widespread cortical areas to encode and then gradually consolidate memories over time. When the hippocampus is damaged, people often struggle to form new memories even though older ones remain, highlighting its pivotal role in encoding and early consolidation. Other regions contribute to related aspects—like the amygdala adding emotional context or the thalamus serving as a relay—but the hippocampus is the primary structure for new memory formation and spatial navigation.