Morning Orientation Research Articles

The relationship between morningness-eveningness and naturalness bias

ABSTRACT The naturalness bias in which people perceive natural items to be safer, healthier, and better than synthetic alternatives has been found to be associated with numerous individual difference variables (e.g. connectedness to nature and religiosity). However, no research has examined the role of morningness-eveningness in influencing preferences for naturalness. Here, we propose that evening individuals may exhibit a weaker preference for naturalness compared to morning individuals due to their greater exposure to artificial lighting, technology, and stimuli. To systematically test our theoretical perspective, we conducted three complementary and high-powered studies. In an online survey (Study 1), student participants with a stronger evening orientation displayed a diminished preference for natural drugs compared to those with a morning orientation. Using a sample of community adults, Study 2 replicated the findings of Study 1 in a real-world, behavioral context. Study 3 examined the relationship between morningness-eveningness and preference for naturalness within the domain of beverages. The results revealed that individuals with an evening-orientation had decreased odds of selecting natural water without minerals. Taken together, the findings suggest that an individual’s diurnal preference toward eveningness may have implications for their bias toward and perception of naturalness across various domains.

The Relationship Among Chronotype, Hardiness, Affect, and Talent and Their Effects on Performance in a Military Context.

Individual preference for morning or evening activities (chronotype), affect, hardiness, and talent are associated with a variety of performance outcomes. This longitudinal study was designed to investigate the degree to which these variables are associated with academic, physical, and military performance. Self-reported measures of chronotype, affect, and hardiness were collected from 1149 cadets from the Class of 2016 upon entry to the United States Military Academy. Talent, a composite of academic, leadership, and physical fitness scores were drawn from cadet records. Academic, military, and physical performance measures were collected at graduation 4years later. The results indicated that a morning orientation was associated with better physical and military performance. Higher talent scores, as well as lower levels of negative affect, were associated with better performance across all three performance measures. Hardiness was only associated with military performance. The findings suggest that a morning orientation and less negative affect may result in better performance overall within a challenging and structured military environment. Future studies of chronotype shifts may provide further insight into associated performance benefits.

Circadian preference and sleep quality in healthy controls and psychiatric inpatients with major depressive disorder – An actigraphy study incorporating morning and evening mood assessments

ABSTRACT Major depressive disorder (MDD) is frequently accompanied by sleep disturbance. Regarding diurnal preference (chronotype), sleep problems and low mood have been associated with evening orientation. Considering diurnal preference, we investigated subjective restorative value of sleep and actigraphy sleep parameters together with mood assessments twice a day, i.e. in the morning and evening, during weekdays and weekends in MDD psychiatric inpatients and healthy controls (HCs). The restorative value of sleep was higher during the weekend in HC, and bedtimes and risetimes were delayed during the weekend compared to weekdays in HC and MDD. Morning mood affected subjective sleep ratings in both groups, while association with symptom severity (BDI) in MDD remained insignificant. In HC, better evening mood was associated with later bedtimes. Regarding the chronotype in HC, evening orientation was associated with relatively low restorative value of sleep during weekdays, and morning orientation was associated with relatively higher actigraphy sleep efficiency during weekdays compared to weekend. In MDD, an association of evening orientation with later rise times could be observed, while no chronotype dependent effect emerged regarding the restorative value of sleep or sleep efficiency. Our results emphasize that research on sleep in MDD should incorporate weekdays as well as weekends, chronotype assessment, and measures of morning and evening mood, as these can be associated with ratings of the subjective restorative value of sleep (i.e. in our study, better morning mood was associated with higher restorative values), but also with behavioral sleep parameters (i.e. in our study, more positive evening mood was associated with later bedtimes). Potentially, the restorative value of sleep in MDD evening types can be improved by maintaining a regular sleep schedule, which needs to be investigated in an experimental design.

The moderating role of personality traits in the relationship between chronotype and depressive symptoms

ABSTRACT Due to the undeniably morning orientation of the social clock, the evening chronotype can be associated with negative consequences, both at the affective and cognitive levels. Evening-oriented individuals are more susceptible to affective disorders, show poorer educational achievements and consume stimulants more often than morning-oriented individuals. However, little is known about potential factors that may attenuate or amplify these negative emotional consequences of the evening preference. Thus, our aim was to examine whether personality traits interplay with chronotype in predicting depressive symptoms. We assessed the Big Five and the Big Two personality traits, morningness-eveningness and depressive symptoms in an online sample of 913 Polish individuals (468 females, 445 males), aged 18–35 (M = 26.34, SD = 5.15). Eveningness, higher neuroticism, lower conscientiousness and lower alpha-stability were associated with higher depressive symptoms. The magnitude of the association between eveningness and depressive symptoms decreased with higher conscientiousness and alpha-stability, as well as with lower neuroticism. In conclusion, high neuroticism, low conscientiousness and low alpha-stability increase the risk of depressive symptoms, particularly among evening chronotypes. The patients’ chronotypes and personality traits should be taken into account in both the prevention and diagnostics of depression.

Political ideology and diurnal associations A dual-process motivated social cognition account.

Social scientists have begun to uncover links between sleep and political attitudes and behaviors. This registered report considers how diurnal morning-night associations relate to political ideology using data from the Attitudes, Identities, and Individual Differences Study, a large-scale online data collection effort. Measures encompass perceived cultural attitudes and social pressures regarding diurnal preferences and explicit and implicit measures of both morning-night attitudes and morning-night self-concepts. Together, the analyses demonstrate a relationship between morning orientation and conservatism for explicit morning-night self-concepts and, to a lesser extent, explicit morning-night attitudes. This relationship is not present for implicit associations, and associations with perceived cultural attitudes and social pressure are also largely absent. This study reinforces the notion that morningness and eveningness as explicit identities are associated with political ideology.

Gifted and non-gifted students’ diurnal preference and the relationship between personality, sleep, and sleep quality

The current study had two main objectives. First, we examined gifted and non-gifted students’ diurnal preferences. Secondly, we examined the relationships among age, gender, personality, sleep quality, and chronotype of gifted students. Data were gathered from 276 gifted students and 1921 non-gifted students whose ages range between 7 and 17 years old, in same three cities in Turkey using the Composite Scale of Morningness (CSM) to assess diurnal preference, the Big Five Inventory (BIG-5) to assess personality and the Pittsburgh Sleep Quality Index (PSQI) to measure sleep quality. The first result indicated that gifted students were more morning-oriented compared to non-gifted students. The other main result was that the conscientiousness was the best predictor of CSM scores in gifted students. Additionally, conscientiousness, age, and global PSQI predicted CSM scores, respectively. Moreover agreeableness, conscientiousness, and emotional stability were positively related to morning orientation, while age, sleep quality, sleep latency, daytime dysfunction, and global PSQI were negatively related with chronotype in gifted students.

Chronotype in patients with epilepsy: A controlled study in 60 subjects with late-onset focal epilepsy.

Studies based on self-administered questionnaires indicate that most patients with epilepsy are morning-oriented. We aimed to investigate chronotype in patients with epilepsy with late-onset focal epilepsy by combining subjective data with dim light melatonin onset (DLMO) as an objective marker of the circadian phase. Sixty adult patients (mean age 46.5±13.8; 27 males) with late-onset focal epilepsy under pharmacological treatment were prospectively studied. Subjective chronotype was determined using the Morningness-Eveningness Questionnaire (MEQ) and circadian phase through analysis of salivary melatonin secretion, considering 3pg/ml as the dim light melatonin onset (DLMO) threshold. The mean MEQ score was significantly higher in the patients with epilepsy than in the controls, and significantly, more patients had a MEQ score indicative of the morning type (50.0% vs 30.0%, p=0.02). However, no significant differences were found in mean time of DLMO (21:38±01:21 vs 21:26±01:03; p=ns), and DLMO time was in the range indicative of an intermediate chronotype in both patients and controls. Sleep onset and sleep offset phase angles were significantly shorter in the patients. Patients whose global MEQ score identified them as morning types were significantly older than those with an intermediate or evening chronotype, and they had less social jet lag. No difference in epilepsy features and treatments was found between morning-oriented and nonmorning-oriented patients. Our analyses showed that the patients with epilepsy tended to be morning-oriented and to perceive themselves as morning types, even though this was not reflected in their DLMO values which did not differ significantly from those of controls and mostly fell within the intermediate chronotype range. Several factors may considerably influence subjective chronotype. We speculate that, in patients with epilepsy, the disease itself, prompting certain lifestyle choices, including a regular sleep schedule and early bedtime, may induce morning orientation and a morning-type self-perception.

Morningness–eveningness, Big Five and the BIS/BAS inventory

Individual differences in morningness–eveningness (M/E) or chronotype are related to many aspects of personality. Here, we assessed the relationship between the behavioural inhibition (BIS) and activation system (BAS) in relation to M/E and sleep timing in 291 University students. We used two measures of M/E, a clock-time based measurement and a preference scale. BAS Drive was related to morningness and BAS Fun Seeking was related to eveningness concerning both M/E measurements. Drive was higher in morning oriented students and Fun Seeking was higher in evening oriented students. Total BAS score was unrelated to the M/E measures because the subscales were correlated with M/E in different directions (one positive, one negative). BIS Fear was related to morningness based on midpoint of sleep (MSF) suggesting that fear was higher in morning oriented students. Total BIS scores were also related to morningness. Concerning the Big Five, we could show that evening orientation was related to extraversion based on midpoint of sleep, and morning orientation to conscientiousness in both M/E measures.

Circadian Preference and Sleep-Wake Regularity: Associations With Self-Report Sleep Parameters in Daytime-Working Adults

The aim of this study was to explore how interindividual differences in circadian type (morningness) and sleep timing regularity might be related to subjective sleep quality and quantity. Self-report circadian phase preference, sleep timing, sleep quality, and sleep duration were assessed in a sample of 62 day-working adults (33.9% male, age 23–48 yrs). The Pittsburgh Sleep Quality Index (PSQI) measured subjective sleep quality and the Sleep Timing Questionnaire (STQ) assessed habitual sleep latency and minutes awake after sleep onset. The duration, timing, and stability of sleep were assessed using the STQ separately for work-week nights (Sunday–Thursday) and for weekend nights (Friday and Saturday). Morningness-eveningness was assessed using the Composite Scale of Morningness (CSM). Daytime sleepiness was measured using the Epworth Sleepiness Scale (ESS). A morning-type orientation was associated with longer weekly sleep duration, better subjective sleep quality, and shorter sleep-onset latency. Stable weekday rise-time correlated with better self-reported sleep quality and shorter sleep-onset latency. A more regular weekend bedtime was associated with a shorter sleep latency. A more stable weekend rise-time was related to longer weekday sleep duration and lower daytime sleepiness. Increased overall regularity in rise-time was associated with better subjective sleep quality, shorter sleep-onset latency, and higher weekday sleep efficiency. Finally, a morning orientation was related to increased regularity in both bedtimes and rise-times. In conclusion, in daytime workers, a morning-type orientation and more stable sleep timing are associated with better subjective sleep quality. (Author correspondence: asoehner@berkeley.edu)

New low cost solar tracker

New low-cost single axis passive solar tracker based on a shape memory alloy (SMA) actuators has been developed. Main advantages of this tracker are low price (below 150 US $/m2), collectible energy surplus up to 40% (compared to fixed tilt collectors), extremely simple (i.e. reliable) modular solid state design, automatic morning orientation, tracking angle 140° and sealed case. First laboratory tests of the solar tracker prototype were just finished. Field tests have been started at present.

Raven Tool Use?

electroretinographic correlate. J. Comp. Physiol. Psychol. 90:560-571. KATZ, Y. B. 1985. Sunset and the orientation of European Robins (Erithacus rubecula). Anim. Behav. 33:825-828. KATZ, Y., AND H. MICHELSONS. 1978. (Influence of direction altering of stellar or magnetic meridians on orientation of European Robins in circular cages at planetarium), p. 182-193. In H. Michelsons, [ed.], Orientation of birds. Riga, Zinatne. (In Russian with English summary.) KREITHEN, M. L., AND W. T. KEETON. 1974. Detection of polarized light by the homing pigeon, Columba livia. J. Comp. Physiol. 89:83-92. MARDIA, K. V. 1972. Statistics of directional data. Academic Press, New York. MOORE, F. R. 1985. Integration of environmental stimuli in the migratory orientation of the Savannah Sparrow (Passerculus sandwichensis). Anim. Behav. 33:657-663. MOORE, F. R. 1986. Sunrise, skylight polarization, and the early morning orientation of night-migrating warblers. Condor 88:493-498. MOORE, F. R. 1987. Sunset and the orientation behaviour of migrating birds. Biol. Rev. Camb. Philos. Soc. 62:65-86. SANDBERG, R., J. PETTERSSON, AND T. ALERSTAM. In press a. Shifted magnetic fields lead to deflections and bimodality in the migratory orientation of R bins Erithacus rubecula at sunset. Anim. Behav. SANDBERG, R., J. PETTERSSON, AND T. ALERSTAM. In press b. Why do Robins Erithacus rubecula captured at two nearby stop-over sites orient differently? Anim. Behav. WALLRAFF, H. G., AND O. G. GELDERLOOS. 1978. Experiments on migratory orientation of birds with simulated stellar sky and geomagnetic field: method and preliminary results. Oikos 30:207-215. WEHNER, R. 1976. Polarized-light navigation by insects. Sci. Am. 235:106-115. WILTSCHKO, R., AND W. WILTSCHKO. 1978. Relative importance of stars and the magnetic field for the accuracy of orientation in night-migrating birds. Oikos 30:195-206. WILTSCHKO, W., H. H6CK, AND F. W. MERKEL. 1971. Outdoor experiments with migrating Robins in artificial magnetic fields. Z. Tierpsychol. 29:409415. WILTSCHKO, W., AND R. WILTSCHKO. 1975. The interaction of stars and magnetic field in the orientation system of night migrating birds. II. Spring experiments with European Robins (Erithacus rubecula). Z. Tierpsychol. 39:265-282.

SUNSET AND THE ORIENTATION BEHAVIOUR OF MIGRATING BIRDS

Summary1. Migratory birds integrate information from a wide array of environmental sources. As our knowledge of migratory orientation depends heavily upon the results of cage‐experiments with nocturnal migrants, it is essential that the results of these cage studies be interpreted in the light of field observations of migratory behaviour and experiments with free‐flying migrants. When this is done, the impression emerges that night‐migrating birds integrate directional information prior to departure, probably during the transition between daylight and darkness. At this time, information gained from the sun, in conjunction with other references, becomes especially valuable.2. Despite intensive work with a few species, how migrants integrate information in the selection and maintenance of a direction is not well understood. The relationship between magnetic stimuli and solar cues at sunset in the selection process, for example, remains to be resolved, as does the contribution of skylight polarization patterns at sunset. Once a migratory heading is selected, birds probably use the stars or winds aloft to maintain that direction.How migrants integrate information is largely a matter of unravelling the complex causal relations among the different environmental stimuli that serve as orientation cues. Imagine a hypothetical migrant that departs on a migratory flight around the time of sunset. Given the uncertain relationship among variables (orientation cues) that might influence her migratory orientation, a path diagram is a useful device for displaying graphically the pattern of causal relations among the set of variables (see Fig. 1). This technique is adopted from path analysis, which is a statistical method developed by Sewall Wright for studying the direct and indirect causal relations among variables (see Kerlinger & Pedhazur, 1973). The pattern depicted in the figure is less a specific model of causal relations than it is a summary of possible relationships among the several cues based on current understanding. Causal flow in this ‘model’ is unidirectional, i.e. at any given point in time a variable cannot be both a cause and an effect of another variable. For example, variable 3 is dependent on variables 1 and/or 2, and is one of the independent variables in relation to variable 5 (orientation of migratory activity). Although the value of path analysis to the study of migratory orientation may be largely heuristic at this point, ‘one virtue of the method is that in order to apply it the researcher is required to make explicit the theoretical framework within which he operates’ (Kerlinger & Pedhazur, 1973). For instance, path diagrams (and path analysis, to the degree that correlations between variables can be specified) would help researchers study (i) the apparent redundancy built into the orientation process (see Fig. 1), (ii) alternative or competing causal models of orientation and navigation, or (iii) the ontogenetic changes that affect the relationship among orientation variables. Imagine, for example, how path coefficients might change in value with migratory experience.3. Migrants probably redetermine preferred directions soon after landing or shortly before their next departure rather than while aloft. Cage‐orientation results as well as observations of free‐flying migrants suggest that solar‐related information is involved in the morning orientation of ongoing migratory flight and possibly the re‐determination of direction following night‐time displacement.4. Evidence is not clear on whether migrants respond to sunset by constant‐angle orientation (menotaxis) or constant‐azimuth orientation.5. How migrants correctly identify sunset as a reference stimulus is an unresolved question. Identification might be based upon the characteristic spectral distribution of sunset, its pattern of illumination, or some other feature, such as the characteristic pattern of skylight polarization at sunset.6. Several lines of evidence suggest that migrants learn to use the setting sun and associated skylight features as orientation cues.7. The setting sun functions not only as a source of directional information but also as an environmental stimulus that influences the likelihood of migratory activity.