That's not entirely accurate. The native ISO ("base sensitivity") just means no analog gain is applied. This is a fairly complex area, but to simplify - for n

That's not entirely accurate. The native ISO ("base sensitivity") just means no analog gain is applied. This is a fairly complex area, but to simplify - for non-dual gain sensors - the sensor captures the same amount of information regardless of ISO setting. The ISO setting then determines how much analog gain to apply, and also how much digital multiplication to apply (if the ISO setting is outside of the analog gain range). No additional information is captured at higher ISO values.