Related Experiment Video
Updated: May 8, 2026
10:16
Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
Published on: April 7, 2020
"Early to bed, early to rise": diffusion tensor imaging identifies chronotype-specificity.
Jessica Rosenberg1, Ivan I Maximov, Martina Reske
1Institute of Neuroscience and Medicine-4, Medical Imaging Physics, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany; Department of Neurology, Faculty of Medicine, RWTH Aachen, JARA, 52074 Aachen, Germany.
Neuroimage
|September 5, 2013
Summary
Late chronotypes exhibit distinct white matter differences in brain regions including the frontal and temporal lobes. These findings link chronotype to brain structure, impacting health and work schedules.
Area of Science:
- Neuroscience
- Chronobiology
- Neuroimaging
Background:
- Sleep and wakefulness are critical for cognitive function, mood, and overall health.
- Individual differences in sleep-wake timing define chronotypes: early (EC), intermediate (IC), and late (LC).
- While chronotypes differ in behavior and physiology, underlying brain structural variations, particularly in white matter (WM), are less understood.
Purpose of the Study:
- To investigate potential differences in white matter (WM) integrity among early (EC), intermediate (IC), and late (LC) chronotypes.
- To explore the relationship between chronotype and brain structural characteristics using advanced neuroimaging techniques.
Main Methods:
- Diffusion Tensor Imaging (DTI) was employed to non-invasively assess WM architecture.
- Track-based spatial statistics were utilized to analyze WM differences in 16 ECs, 23 LCs, and 20 ICs.
Main Results:
- Late chronotypes (LCs) showed significant WM differences in the frontal and temporal lobes, cingulate gyrus, and corpus callosum.
- These structural variations in LCs may be associated with chronic jet lag, sleep disturbances, and increased substance use.
Conclusions:
- Chronotype is associated with distinct white matter (WM) structural characteristics in the human brain.
- Understanding these differences has implications for public health, economic productivity, and personalized work scheduling.
Related Concept Videos
02:19Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
02:19Circadian Rhythms and Gene Regulation
The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
01:15Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response
Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
02:45Biological Clocks and Seasonal Responses
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
01:11Understanding Sleep
Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...