What is the name of the graphical representation showing periods of activity and rest of an organism?

The term that describes the graphical representation showing periods of activity and rest of an organism is called an actogram. An actogram visually displays the activity patterns of an organism over a specific period, often highlighting cycles of activity and inactivity that correspond with environmental cues or circadian rhythms.

This representation is typically used in chronobiology to study the behavioral patterns of various organisms, demonstrating how their activity levels change in response to light and dark cycles, as well as other stimuli. Actograms are essential for understanding the biological rhythms that influence an organism's behavior, including sleep-wake cycles, feeding patterns, and other daily activities.

Understanding this concept can help in the analysis of how organisms adapt their behavior to their environments, allowing for insights into their survival and reproductive strategies.