Researchers studying the links among emotion, stress, and memory have discovered that a emotion blocks memory, and it is generally true that we are unable to recall highly emotional events. b stress tends to increase the chance that an event will be remembered ,but excitement decreases the chance that an event will be remembered. excitement tends to increase the chance that an event will be remembered but stress decreases the chance that an event will be remembered d both stress and emotion make events more memorable. both stress and/emotion make events harder to remember.