Dr. Charan Ranganath: How to Improve Memory & Focus Using Science Protocols
Memory is more than an archive of names, facts, and past events. It supplies the context through which we interpret the present, maintain a coherent identity, and decide what to do next. When memory is disrupted by injury, aging, depression, or neurodegenerative disease, the consequences can therefore reach far beyond ordinary forgetfulness.
In this conversation with Andrew Huberman, neuroscientist Dr. Charan Ranganath explains how memory interacts with attention, curiosity, dopamine, exercise, purpose, and emotion. Their discussion also offers practical ways to improve how experiences are encoded and retrieved—while emphasizing that forgetting is normal and that memory is a dynamic reconstruction, not a literal recording.
Memory Helps the Brain Predict What Comes Next
Ranganath describes memory as a system for extracting useful information from the past. The brain draws on previous experience to decide what deserves attention, interpret ambiguous situations, and anticipate likely outcomes. What we perceive is therefore influenced not only by incoming sensory information but also by what we already know and expect.
Episodic memory—the ability to mentally revisit particular events—is especially important for situating ourselves in time and place. It helps answer questions such as how we arrived somewhere, what happened earlier, and what we intended to do next.
Memory also contributes to identity. According to Ranganath, people with severe amnesia can retain an established sense of self, yet that identity may stop incorporating new experiences. The self remains, but its story becomes difficult to update.
Aging does not necessarily eliminate the brain’s capacity to change. Ranganath argues that apparent rigidity may also reflect accumulated knowledge, established routines, narrower environments, and reduced cognitive flexibility. Remaining open to unfamiliar experiences may help keep learning active.
Curiosity Creates Better Conditions for Learning
One of the conversation’s most actionable ideas is that curiosity can prime the brain to remember. Ranganath discusses research in which participants rated how eager they were to learn the answers to trivia questions. Greater curiosity corresponded with stronger activity in reward-related brain regions associated with dopamine.
This does not mean dopamine is simply a “pleasure chemical.” Huberman and Ranganath discuss it as part of a broader system involved in movement, motivation, learning, and the pursuit of information or rewards. Curiosity may energize the search for an answer while placing the brain in a state that favors memory formation.
The practical lesson is to generate a question before consuming information. Instead of passively opening a book, lecture, or meeting document, identify a gap you genuinely want to close. Ask what is surprising, unresolved, personally consequential, or connected to something you already understand.
Curiosity can also be cultivated through appraisal. An unfamiliar subject may initially seem irrelevant, but considering why it matters—or how it connects to a valued goal—can make it more engaging. Exposure to varied people, places, and ideas gives the brain more opportunities to discover those connections.
The Hippocampus Builds Contextual Memories
Ranganath characterizes the hippocampus as a binding system. It combines sights, sounds, smells, concepts, emotions, locations, and timing into an event that can later be reconstructed. This contextual binding supports episodic memory: remembering not merely a fact, but where it came from and how it fits into a particular experience.
The prefrontal cortex plays a different but complementary role. It helps regulate perception, thought, and behavior in accordance with higher-level goals. Someone may be capable of holding information in mind yet lose it when distractions intrude. In that case, the apparent memory problem may partly be a problem of cognitive control.
This distinction matters when interpreting age-related changes. Older adults often perform worse on unfamiliar laboratory memory tasks, but Ranganath notes that such tests also demand sustained attention and resistance to distraction. Changes in prefrontal function and white-matter integrity may make it harder to select relevant information, even when basic storage is not the only issue.
Depression can compound these difficulties. The speakers discuss how rumination consumes cognitive resources and can severely impair memory performance. Depression is also associated with elevated Alzheimer’s disease risk, making mental health an important part of any broader discussion of cognitive aging.
Intention Protects Attention
Forgetting is not automatically evidence that memory has failed. Most details of daily life disappear because the brain cannot preserve everything. What is remembered depends heavily on what received attention during the original event.
Ranganath distinguishes intention from attention. Attention is what the mind is processing now; intention is the goal that should direct that processing. In a distraction-rich environment, outside systems can repeatedly capture attention unless an internal objective provides a stronger organizing signal.
Frequent task-switching carries several costs. Checking a phone during a conversation does not merely consume a few seconds. It changes the continuity of the experience, divides encoding across competing contexts, and can leave behind a fragmented memory.
A practical focus protocol follows from this account:
Decide what the current period is for before beginning.
Remove alerts and unrelated phone functions from the immediate environment.
Give social media and messaging their own scheduled windows.
When interrupted, restate the original goal before resuming.
This approach does not require permanent disconnection. It creates clearer boundaries so that each activity can become a more coherent memory.
Use Photographs as Retrieval Cues, Not Substitutes
Photography can either weaken or support recall, depending on how it is used. Mindlessly documenting everything may pull attention away from the event itself. The person becomes occupied with collecting images rather than noticing the experience those images are meant to preserve.
Intentional photography works differently. Choosing a particular expression, detail, or viewpoint requires engagement. The resulting photograph can later function as a cue that helps reconstruct the wider episode.
Review matters too. Rather than scrolling rapidly through an image library, pause and actively retrieve what happened: Who was there? What occurred immediately before and afterward? What were you thinking or feeling? This practice may strengthen access to the event, although repeated retelling can also make the memory more schematic and story-like over time.
Exercise, Purpose, and Everyday Brain Maintenance
The discussion places cardiovascular exercise among the strongest practical supports for learning and brain health. Raising the heart rate for roughly 12 to 60 minutes can benefit the biological conditions that enable learning, although an appropriate routine depends on health status and fitness level.
Ranganath also highlights evidence linking combinations of healthy behaviors with better memory outcomes over time. Diet is one component, with leafy greens discussed as a food pattern associated with preserved cognitive function. The broader point is cumulative: exercise, nutrition, social engagement, and other protective habits may reinforce one another.
Purpose is another important contributor to cognitive reserve—the capacity that may help the brain remain functional despite aging or pathology. Purpose need not involve a grand mission. Responsibility for students, relatives, colleagues, pets, or a community can create structure and motivation.
For people with ADHD or executive-function difficulties, Ranganath recommends identifying and ranking personal values. A goal becomes easier to pursue when its connection to something meaningful is explicit. “Focus on this task” is abstract; “finish this because it supports the person or principle I care about” supplies a reason to mobilize attention.
Practical brain maintenance also includes addressing sensory and physical health. The speakers discuss hearing correction, vision, oral hygiene, inflammation, and the cognitive effects associated with long COVID. Treating hearing loss, for example, may reduce isolation and cognitive strain while supporting healthier aging. These are medical issues that warrant professional assessment rather than self-treatment.
Memory Can Change When It Is Retrieved
Remembering is reconstructive. Each retrieval can make a memory temporarily open to modification, allowing new information, interpretations, or emotional responses to become attached to it. This malleability helps explain how therapy and supportive social perspectives can alter the meaning of an experience without erasing its history.
Huberman and Ranganath discuss serotonin, neuroplasticity, and the perspective shifts sometimes reported with psychedelic drugs. The relevant principle is that changing the frame around a memory can change its present emotional influence. However, psychedelics carry substantial risks and are not presented as a casual self-help intervention.
Traumatic memories are particularly resistant to reframing because they are linked to intense physiological and emotional responses. Ranganath cautions that poorly handled attempts to retell trauma can strengthen distress instead of resolving it. PTSD and serious trauma should be addressed with appropriately trained professionals.
Group therapy can sometimes provide corrective context: other people’s reactions may challenge shame, isolation, or a rigid personal narrative. Even ordinary nostalgia illustrates the same principle. Revisiting the past can support well-being, but it can become harmful when an idealized history is repeatedly used to condemn the present.
Déjà Vu and the Brain’s Familiarity Signal
Déjà vu offers a glimpse into how the brain separates familiarity from explicit recollection. Although its mechanisms remain unsettled, Ranganath notes links with temporal-lobe epilepsy and early surgical observations in which stimulation of anterior temporal regions produced déjà vu-like sensations.
The perirhinal cortex, which contributes to judgments of familiarity, may be central to the experience. One possibility is that a new situation triggers an unusually strong familiarity signal without supplying the contextual details that would explain why it feels known. The result is the uncanny conviction that the present has happened before, even when no matching episode can be retrieved.
A Practical Philosophy of Better Memory
The conversation ultimately shifts the goal from storing more information to engaging more deliberately with experience. Strong memories are more likely when attention is guided by intention, curiosity makes information valuable, and the event is encoded within a clear context.
The most useful protocols are therefore straightforward: protect periods of single-task focus, ask questions before learning, exercise regularly, connect goals to personal values, address health problems that increase cognitive strain, and use photos or notes as prompts for active recall. Memory will remain selective and imperfect—but that selectivity is part of how it helps us navigate life.
