scholarly journals Effects of 15-Day Head-Down Bed Rest on Emotional Time Perception

2021 ◽  
Vol 12 ◽  
Author(s):  
Yiming Qian ◽  
Shan Jiang ◽  
Xiaolu Jing ◽  
Yusheng Shi ◽  
Haibo Qin ◽  
...  
Keyword(s):  
Time Perception ◽  
Science Research ◽  
Bed Rest ◽  
Successful Implementation ◽  
Emotional Stimuli ◽  
Physiological Factors ◽  
Emotional Picture ◽  
Picture Stimuli ◽  
Temporal Bisection Task ◽  
New Evidence

Accurate time perception is clearly essential for the successful implementation of space missions. To elucidate the effect of microgravity on time perception, we used three emotional picture stimuli: neutral, fear, and disgust, in combination with a temporal bisection task to measure 16 male participants’ time perception in 15 days of –6° head-down bed rest, which is a reliable simulation model for most physiological effects of spaceflight. We found that: (1) participants showed temporal overestimation of the fear stimuli in the middle phase (day 8), suggesting that when participants’ behavioral simulations were consistent with the action implications of the emotional stimuli, they could still elicit an overestimation of time even if the subjective arousal of the emotional stimuli was not high. (2) Participants’ temporal sensitivity tends to get worse in the bed rest phase (days 8 and 15) and better in the post-bed rest phase, especially for neutral and fear stimuli, suggesting that multiple presentations of short-term emotional stimuli may also lead to a lack of affective effects. This reduced the pacemaker rate and affected temporal perceptual sensitivity. Also, this may be related to changes in physiological factors in participants in the bed rest state, such as reduced vagal excitability. These results provide new evidence to support the theory of embodied cognition in the context of time perception in head-down bed rest and suggest important perspectives for future perception science research in special environments such as microgravity.

A barrier diagnostic framework in process of digital transformation in higher education institutions

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bayu Rima Aditya ◽  
Ridi Ferdiana ◽  
Sri Suning Kusumawardani
Keyword(s):  
Higher Education ◽  
Process Model ◽  
Design Science ◽  
Research Question ◽  
Science Research ◽  
Digital Transformation ◽  
Successful Implementation ◽  
Content Type ◽  
Systematic Understanding ◽  
Diagnostic Framework

PurposeExisting literature has reported a barrier list that could affect the implementation of digital transformation in higher education, yet the research question of how to identify barriers remained unanswered. Thus, this study intended to address this gap.Design/methodology/approachThe research design adopted a mixed-methods approach based on the problem-centered design science research (DSR) process model for the development and evaluation of framework.FindingsThis study proposed a systematic framework of three sets of components: (1) the initial set of barriers; (2) the barrier rating scheme and (3) the barrier scoring matrix. The three-component of the framework is to identify and prioritize barriers to the successful implementation of digital transformation in higher education.Research limitations/implicationsThe evaluation of the framework was only based on an expert opinion.Practical implicationsThis study provided a direction to the policymakers for designing sensible strategies to increase the chances of a successful digital transformation in higher education.Originality/valueThis study contributes to the knowledge body by offering a more systematic understanding of barriers to digital transformation in higher education.

scholarly journals Perceptual Content, Not Physiological Signals, Determines Perceived Duration When Viewing Dynamic, Natural Scenes

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Marta Suárez-Pinilla ◽  
Kyriacos Nikiforou ◽  
Zafeirios Fountas ◽  
Anil K. Seth ◽  
Warrick Roseboom
Keyword(s):  
Time Perception ◽  
Physiological Signals ◽  
Perceptual Content ◽  
Natural Scenes ◽  
Neural Basis ◽  
Recent Proposal ◽  
Physiological Factors ◽  
Physiological Processes ◽  
Scene Content ◽  
Perceived Duration

The neural basis of time perception remains unknown. A prominent account is the pacemaker-accumulator model, wherein regular ticks of some physiological or neural pacemaker are read out as time. Putative candidates for the pacemaker have been suggested in physiological processes (heartbeat), or dopaminergic mid-brain neurons, whose activity has been associated with spontaneous blinking. However, such proposals have difficulty accounting for observations that time perception varies systematically with perceptual content. We examined physiological influences on human duration estimates for naturalistic videos between 1–64 seconds using cardiac and eye recordings. Duration estimates were biased by the amount of change in scene content. Contrary to previous claims, heart rate, and blinking were not related to duration estimates. Our results support a recent proposal that tracking change in perceptual classification networks provides a basis for human time perception, and suggest that previous assertions of the importance of physiological factors should be tempered.

Emotional stimuli facilitate time perception in children with attention-deficit/hyperactivity disorder

2016 ◽  
Vol 12 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Mohammad A. Nazari ◽  
Mohammad M. Mirloo ◽  
Mazaher Rezaei ◽  
Mojtaba Soltanlou
Keyword(s):  
Attention Deficit Hyperactivity Disorder ◽  
Time Perception ◽  
Attention Deficit ◽  
Emotional Stimuli ◽  
Hyperactivity Disorder

Changes in leg vein filling and emptying characteristics and leg volumes during long-term head-down bed rest

1997 ◽  
Vol 82 (6) ◽  
pp. 1726-1733 ◽  
Author(s):  
Francis Louisy ◽  
Philippe Schroiff ◽  
Antonio Güell
Keyword(s):  
Bed Rest ◽  
Venous Occlusion ◽  
Arterial Flow ◽  
Flow Index ◽  
Venous Compliance ◽  
Physiological Factors ◽  
Control Value ◽  
Flow Changes ◽  
Mercury Strain Gauge

Louisy, Francis, Philippe Schroiff, and Antonio Güell.Changes in leg vein filling and emptying characteristics and leg volumes during long-term head-down bed rest. J. Appl. Physiol. 82(6): 1726–1733, 1997.—Leg venous hemodynamics [venous distensibility index (VDI), arterial flow index (AFI), half-emptying time (T1/2)], and leg volumes (LV) were assessed by mercury strain-gauge plethysmography with venous occlusion and volometry, respectively, in seven men before, during, and after 42 days of 6° head-down bed rest. Results showed a high increase in VDI up to day 26 of bed rest (+50% vs. control at day 26, P < 0.05), which tended to subside thereafter (+20% increase vs. control value at day 41, P < 0.05). VDI changes were associated with parallel changes in T1/2 (+54% vs. control at day 26 of bed rest, P < 0.05, and +25% vs. control at day 41, P < 0.05) and with a decrease in AFI (−49% at day 41 vs. control, P < 0.05). LV continuously decreased throughout bed rest (−13% vs. control at day 41, P < 0.05) but was correlated with VDI only during the first month of bed rest. These results show that during long-term 6° head-down bed rest alterations of leg venous compliance are associated with impairment of venous emptying capacities and arterial flow. Changes in skeletal muscle mass and fluid shifts may account for venous changes during the first month of bed rest but, subsequently, other physiological factors, to be determined, may also be involved in leg venous hemodynamic alterations.

scholarly journals Dissociable Effects of Emotional Stimuli on Perception and Decision-Making for Time

2020 ◽  
Author(s):  
Keri Gladhill ◽  
Giovanna Mioni ◽  
Martin Wiener
Keyword(s):  
Decision Making ◽  
Time Perception ◽  
Accumulation Rate ◽  
Late Positive Component ◽  
N170 Component ◽  
Bisection Point ◽  
Significant Difference ◽  
The Face ◽  
Temporal Bisection Task ◽  
Negative Face

AbstractPrevious research has demonstrated that negative emotional faces dilate time perception, however, the mechanisms underlying this phenomenon are not fully understood. Previous attempts focus on the pacemaker-accumulator model of time perception, which includes a clock, memory, and decision-making stage, wherein emotion affects one of these stages; possibly by increasing pacemaker rate via arousal, increasing accumulation rate via attention, or by biasing decision-making. To further investigate the stage(s) that emotion is affecting time perception we conducted a visual temporal bisection task with sub-second intervals while recording 64-channel electroencephalogram (EEG). To separate the influence of face and timing responses the temporal stimulus was preceded and followed by a face stimulus displaying a neutral or negative expression creating three trial-types: Neg→Neut, Neut→Neg, or Neut→Neut. The data revealed a leftward shift in bisection point (BP) in Neg→Neut and Neut→Neg suggesting an overestimation of time. Neurally, we found the face-responsive N170 component was larger for negative faces and the N1 and contingent negative variation (CNV) were larger when preceded by a negative face. We also found an interaction effect between condition and response for the late positive component of timing (LPCt) and a significant difference between response (short/long) in the neutral condition. We conclude that a preceding negative face affects the clock stage leading to more pulses being accumulated, either through attention or arousal, as indexed by a larger N1, CNV, and N170; whereas viewing the negative face second biased decision-making leading to “short” responses being less likely, as evidenced by the LPCt.

scholarly journals The Varying Coherences of Implied Motion Modulates the Subjective Time Perception

2021 ◽  
Vol 12 ◽  
Author(s):  
Feiming Li ◽  
Lei Wang ◽  
Lei Jia ◽  
Jiahao Lu ◽  
Youping Wu ◽  
...  
Keyword(s):  
Time Perception ◽  
Subjective Experience ◽  
Subjective Time ◽  
Implied Motion ◽  
Experience Of Time ◽  
Standard Duration ◽  
Mediating Factor ◽  
Temporal Bisection Task ◽  
Coherence Level ◽  
Perceived Duration

Previous research has demonstrated that duration of implied motion (IM) was dilated, whereas hMT+ activity related to perceptual processes on IM stimuli could be modulated by their motion coherence. Based on these findings, the present study aimed to examine whether subjective time perception of IM stimuli would be influenced by varying coherence levels. A temporal bisection task was used to measure the subjective experience of time, in which photographic stimuli showing a human moving in four directions (left, right, toward, or away from the viewer) were presented as probe stimuli. The varying coherence of these IM stimuli was manipulated by changing the percentage of pictures implying movement in one direction. Participants were required to judge whether the duration of probe stimulus was more similar to the long or short pre-presented standard duration. As predicted, the point of subjective equality was significantly modulated by the varying coherence of the IM stimuli, but not for no-IM stimuli. This finding suggests that coherence level might be a key mediating factor for perceived duration of IM images, and top-down perceptual stream from inferred motion could influence subjective experience of time perception.

Emotion and Motivation: Attention, Perception, and Action

2000 ◽  
Vol 22 (s1) ◽  
pp. S122-S140 ◽  
Author(s):  
Peter J. Lang
Keyword(s):  
Human Subjects ◽  
Mammalian Brain ◽  
Attentional Processing ◽  
Motivational Systems ◽  
Functional Changes ◽  
Affective Expression ◽  
Emotional Picture ◽  
Picture Stimuli ◽  
Expression Evaluation ◽  
The Brain

Emotions are organized around 2 basic motivational systems, appetitive and defensive, that evolved from primitive neural circuits in the mammalian brain. The appetitive system is keyed for approach behavior, founded on the preservative, sexual, and nurturant reflexes that underlie pleasant affects; the defense system is keyed for withdrawal, founded on protective and escape reflexes that underlie unpleasant affects. Both systems control attentional processing: Distal engagement by motive-relevant cues prompts immobility and orienting. With greater cue proximity (e.g., predator or prey imminence), neural motor centers supercede, determining overt defensive or consummatory action. In humans, these systems determine affective expression, evaluation behavior, and physiological responses that can be related to specific functional changes in the brain. This theoretical approach is illustrated with psychophysiological and brain imagery studies in which human subjects respond to emotional picture stimuli.

scholarly journals Research Impact Through Matchmaking (RITM): Why and How to Connect Researchers and Practitioners

2019 ◽  
Vol 53 (2) ◽  
pp. 265-269 ◽  
Author(s):  
Adam Seth Levine
Keyword(s):  
Social Science ◽  
Social Science Research ◽  
Science Research ◽  
Research Impact ◽  
Evidence Based ◽  
Organizational Diversity ◽  
Social Scientists ◽  
The Impact ◽  
New Evidence

ABSTRACTResearchers and practitioners increasingly want to learn from one another and work together to solve problems. This article presents results from a new evidence-based approach for connecting them, called Research Impact Through Matchmaking (RITM). This method leverages research on organizational diversity to initiate new relationships between diverse people. The article describes the method and presents data from 37 new connections between practitioners working at nonprofits and social scientists. To my knowledge, this is the first dataset describing reasons why a large variety of nonprofit practitioners value social science research. I also document the impact of these matches. Overall, this article provides actionable guidance for those who want to initiate their own new connections (i.e., match themselves) and/or to broker new connections between others.

scholarly journals When Dogs Shrink the Typical Lengthening Effect Caused by Negative Emotions

2021 ◽  
Vol 68 (2) ◽  
pp. 94-106
Author(s):  
Quentin Hallez ◽  
Nicolas Baltenneck ◽  
Anna-Rita Galiano
Keyword(s):  
Facial Expressions ◽  
Time Perception ◽  
Negative Emotions ◽  
Emotional Facial Expressions ◽  
Bisection Task ◽  
Temporal Bisection ◽  
Dog Owners ◽  
Temporal Bisection Task ◽  
Emotional Effects

Abstract. This paper examines how dogs can modulate the effects of emotion on time perception. To this end, participants performed a temporal bisection task with stimulus durations presented in the form of neutral or emotional facial expressions (angry, sad, and happy faces). In the first experiment, dog owners were compared with nondog owners, while in the second experiment, students were randomly assigned to one of the three waiting groups (waiting alone, with another person, or with a dog) before being confronted with the temporal bisection task. The results showed that dogs allowed the participants to regulate the intensity of negative emotional effects, while no statistical differences emerged for the happy facial expressions. In certain circumstances, dogs could even lead the subjects to generate underestimation of time when faced with negative facial expressions.

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