When markets move sharply, as they did today with the India VIX rising over 6% and the broader indices declining meaningfully, investor behaviour often shifts in ways that are not always grounded in rational analysis. Researchers in the field of behavioural finance have identified a set of recurring mental patterns, called biases, that tend to become more pronounced during periods of uncertainty. Understanding these patterns is a useful form of financial literacy, regardless of one's investment experience.

Market volatility does not create behavioural biases; it tends to make pre-existing ones more visible and more consequential.

One of the most commonly observed biases is loss aversion, a tendency for people to feel the pain of a loss more acutely than the pleasure of an equivalent gain. Studies in behavioural economics suggest this asymmetry can be roughly two to one, meaning a loss of Rs 10,000 may feel twice as distressing as a gain of Rs 10,000 feels rewarding. In volatile sessions, this can lead investors to focus disproportionately on the decline in their portfolio value rather than placing it in the context of their original investment horizon or overall financial plan. A related pattern is recency bias, where recent events, such as a sharp single-day drop, feel more representative of the future than the longer historical record would suggest. When crude oil spikes and markets fall in the same session, the combination of vivid, recent negative news can make a temporary situation feel permanent.

A third common bias is the herd instinct, or social proof bias, where individuals look to the behaviour of others as a signal of what is correct. In falling markets, this can amplify selling pressure beyond what underlying fundamentals might justify, as each investor observes others appearing to exit and interprets that as confirming information. Finally, there is confirmation bias, the tendency to seek out news or data that supports a conclusion already reached, while discounting information that contradicts it. During a volatile day, an investor who has decided markets will fall further may notice only the bearish headlines and filter out stabilising data points, such as the domestic institutional buying of Rs 1,509 crore recorded today. Awareness of these patterns is not a remedy in itself, but recognising them is often the first step toward more considered, less reactive thinking about long-term financial goals.