咖啡饮用对皮电、心率等生理信号的影响以及情绪感知之间的关联

… dimensions of emotion such as emotional valence. These experiments documented … caffeine influences emotion and emotion regulation choice and success. Low to abstinent caffeine …

… existing in a particular study, heart rate may increase,45'46'… suggest that heart rate is, at best, a complex index of caffeine-… effects of caffeine is seen in research on electrodermal activity (…

Effects of nicotine and caffeine, separately and in combination, were assessed in 12 male habitual smokers in a repeated-measures design. Caffeine (0-mg vs. two 150-mg doses administered in a decaffeinated/sugar-free cola drink post-baseline and 90 min later) was crossed with nicotine (ad libitum own dosing vs. 1.0-mg machine-delivered dose vs. 0.05-mg machine-delivered dose). Participants smoked a total of five cigarettes at 30-min intervals over a 2-hr period. Caffeine and nicotine had large effect sizes on electroencephalogram (EEG) power; however, these effects were modulated by the eyes open versus closed condition, the other drug, and electrode site. EEG effects of open versus closed eyes tended to be of the same size and direction as those of nicotine and caffeine. However, whereas nicotine increased EEG power in some higher frequency bands in some conditions, caffeine decreased EEG power across almost all conditions. Serum cortisol concentration, vigor, and pleasantness were increased by nicotine, but not by caffeine. Level of depressive mood depended on an interaction of caffeine and nicotine. Vigilance performance was enhanced significantly by caffeine and was increased almost significantly by nicotine. The findings were interpreted in terms of common and differential mechanisms of the two drugs.

BACKGROUND Coffee is a natural drink with important properties for the human body and mind, capable of delivering energy and strong emotions, thus being appreciated since ancient times. The qualitative and quantitative assessment of the coffee properties is normally performed by trained panelists, however relying on standardized questionnaires, with possible biases arising. In the present study, for the first time in the scientific literature, we applied a technology-based approach, based on the use of wearable sensors, to study the implicit emotional responses of a small cohort of experienced coffee judges, thus taking this chance to assess the approach feasibility in such a scenario. The merging of different technologies for capturing biomedical signals, including electrocardiogram (ECG), galvanic skin response (GSR) and electroencephalogram (EEG) was therefore adopted, to retrieve results in terms of the relationships between implicit (i.e., psychophysiological) and explicit (i.e., derived from questionnaires) measurements. RESULTS Significant correlations were obtained between biomedical signals and data from the questionnaires within all the sensory domains (olfaction, vision, taste) investigated, particularly concerning autonomic-related features. CONCLUSIONS The results obtained confirmed the viability of this new approach in the psychophysical and emotional assessment in coffee tasting judges, paving the way for a new perspective into the universe of coffee quality assessment panels, eventually transferable to broader scale investigations, somewhat dealing with consumer satisfaction and neuromarketing at large. This article is protected by copyright. All rights reserved.

Coffee is consumed worldwide, but there are different types of espresso blends, each with its unique concentration of caffeine, which can have different effects on the human being. The aim of this study was to understand the effect of the impact of caffeine on the autonomic nervous system, evaluating the physiological changes and subjective responses due to different levels of caffeine intake. A double-blind tasting task consisting of one within-subject factor design (caffeine level: high / double caffeine mixture (blend A) vs single-charge caffeine mixture (blend B) vs low-caffeine mixture (blend c) allowed us to assess participants’ autonomic responses using Heart Rate Variability (HRV) and Pupillary Reactivity (PR). Arousal was also assessed through the Self-Assessment Manikin (SAM). Results revealed statistically significant differences in HRV and PR between coffee blends, showing the blend A,a more pronounced autonomic response that blend C. However, no significant dif - ferences were found in arousal level among coffee blends. These results are similar to previous research that pointed out to a discordance between subjective and objective measures when caffeine is consumed.

… the effect of caffeine level in tea and coffee on acute physiological responses and mood. … Significant dose–response relationships to caffeine were seen only for SBP, heart rate, and …

Abstract Consumers’ physiological responses, such as heart rate, electrodermal responses and frontal alpha activity can enhance the understanding of the consumers’ food experience. This study looked at physiological responses of the autonomic nervous system (heart rate, electrodermal responses) as a measure for level of arousal, and to responses of the central nervous system (frontal alpha asymmetry, FAA) as a measure for approach/withdrawal motivational tendency, to accepted (liked) and non-accepted (disliked) solutions and drinks. Participants (n = 32, age range: 18–34 years) were presented with a universally accepted (sucrose) and non-accepted (caffeine) solution, a personally selected accepted and non-accepted drink, and plain water. Heart rate, heart rate variability, electrodermal activity and electro-encephalography for FAA at F7 and F8 (10/20 system, 25 channels, 256 Hz) were registered during tasting. Statistical analysis consisted of linear mixed model analyses. We found a significantly higher heart rate during tasting of the personally selected non-accepted drink and a significantly lower latency of the electrodermal response during tasting of the universally non-accepted solution and personally selected non-accepted drink. No significant results were observed for FAA. This is one of the first studies that examined physiological responses including frontal alpha asymmetry during actual tasting. This study provides an exploratory method to obtain implicit measurement of acceptance and food product-elicited emotion through physiological responses and supports the importance of the inclusion of implicit measures, next to explicit measures, in sensory evaluation of food products.

… alone, but exert opposite effects on arousal, in that caffeine … caffeine and theanine influenced cognition under emotional … (200 mg caffeine + 0 mg theanine, 0 mg caffeine + 200 mg …

… show increases in heart rate with caffeine administration (23, … electrodermal finding is that administration of caffeine … Loke, WH Effects of caffeine on mood and memory. Physiol. …

… caffeine. … heart rate, and skin temperature (ST) were recorded during a rest period, a series of non-signal tones, and a simple reaction time task. Caffeine increased resting electrodermal …

… and DBP), heart rate, skin … mood were monitored in 16 healthy caffeine-withdrawn (14 h) subjects in a complete crossover design. Beverages were ingested with/without 100 mg caffeine …

Our objective was to elucidate the effects of tea consumption on refreshment and stress reduction/recovery through examining the multiple associations among factors such as various physiological responses and task performance. Participants included 20 healthy young men who performed a mental arithmetic task while 11 physiological responses were measured. The experiments were conducted twice under different beverage consumption conditions on separate days. The mental arithmetic task was executed six times in 1 day; participants ingested hot water, green tea, or roasted green tea (hojicha) before each task. Several subjective assessments: subjective fatigue, stress, mental workload, and flow were evaluated after each task. The R–R intervals, heart rate variability spectral components, the Poincaré plot indices (SD1 and SD2) and plethysmogram amplitude tended to decrease during task periods compared to resting periods. Tissue blood volume/flow (TBV, TBF) and near-infrared spectroscopy responses (NIRS) were lower in the tea condition than in the hot water condition. By scrutinizing various indicators, we found that aromatic stimulation of Japanese tea beverages has the potential to induce positive effects, enhance mental task performance, promote refreshment, and alleviate feelings of fatigue. These positive effects were observed even in small quantities and within a short duration, mirroring responses observed in daily consumption.

… (HR, HRV, and EDA) after drinking the caffeinated beverage or water. … to measure skin conductance over the one-hour period. … they concluded that caffeine’s effect on HRV was unclear. …

… greater emotional responding compared to high-AS subjects in the PC condition. In contrast, low AS subjects' emotional response to caffeine was not affected by the perceived control …

… of emotional and stress reactions, is also responsive to caffeine … sensations evoked by caffeine might be perceived as an … expected caffeine to result in subjective and autonomic arousal…

… autonomic and respiratory responses. The startle eyeblink responses were decreased when caffeine-induced arousal occurred unexpectedly, eg, after administering caffeine in bitter …

… as caffeine, it is not clear how these compounds may affect other higher level cognitive processes such as emotional perception … clonidine on arousal and autonomic functions in human …

… neutral or emotional pictures between the placebo and caffeine … increased startle magnitude in response to neutral stimuli (p = .… in response to unpleasant stimuli (p = .02) in the caffeine …

… A review of the recent literature shows the role of caffeine in the physiology, mood, and … in catecholamines and peripheral autonomic stimulation by caffeine affect central nervous …

… of caffeine which was not detectable, yet would produce an increase in autonomic arousal. … which subjects are not able to perceive and which is sensitive to caffeine effects (Lane & Wil…

… Caffeine increased startle reflex magnitude and feelings of stress compared to the control … -induced arousal modulates somatomotor and autonomic classical conditioning in humans. …

… as perceived tiredness are differentially important for performance on simple tasks. Caffeine … reduced ratings of sleepiness on the SSS and increased feelings of alertness as measured …

Introduction Caffeine is the most widely consumed psychoactive substance, and its stimulant properties are well documented, but few investigations have examined its acute effects on brain and cardiovascular responses during cognitively demanding tasks under ecologically valid conditions. Method This study used wearable biosensors and machine learning analysis to evaluate the effects of moderate caffeine (162 mg) on heart rate variability (HRV), entropy, pulse transit time (PTT), blood pressure, and EEG activity. Twelve healthy male participants (20–30 years) completed a within-subjects protocol with pre-caffeine and post-caffeine sessions. EEG was recorded from seven central electrodes (C3, Cz, C4, CP1, CP2, CP5, CP6) using the EMOTIV EPOC Flex system, and heart rate (HR) and blood pressure (BP) were continuously monitored via the Huawei Watch D. Data analysis included power spectral density (PSD) estimation, FOOOF decomposition, and unsupervised k-means clustering. Results Paired-sample t-tests assessed physiological and EEG changes. Although systolic and diastolic BP showed a non-significant upward trend, HR decreased significantly after caffeine intake (77 ± 5.3 bpm to 72 ± 2.5 bpm, p = 0.027). There was a significant increase in absolute alpha power suppression (from −5.1 ± 0.8 dB to −6.9 ± 0.9 dB, p = 0.04) and beta power enhancement (−4.7 ± 1.2 dB to −2.3 ± 1/1, p = 0.04). The surface data from FOOOF shows these are real oscillatory changes. Based on the changes in clustering prior and post-caffeine, a machine-learning change in the brain activity differentiated pre/post-caffeine states with unsupervised clustering. The study results show that moderate caffeine resulted in synchronized EEG and cardiovascular changes, indicating increased arousal and cortical activation that are detectable with wearable biosensors and classifiable with machine learning. Conclusion A fully integrated, non-invasive methodology based on a wearable device for real-time monitoring of cognitive states holds promise in the context of digital health, fatigue detection, and public health awareness efforts.

… examined mood- and performance-enhancing effects of acute caffeine administration in 102 individuals who were not daily caffeine … that caffeine produces direct effects upon mood and …

… The day dependence is likely due to two factors: 1)variations in physiology that may be caused by caffeine,sugar, sleep, hormones, and other nonemotional factors; 2)variations in …

… physiological signals such as PPG, ECG, EMG, GSR, and Temperatrue are discussed and assessed in the emotion analysis and recognition. … with caffeine in 2 hours before experiment. …

… deal in using physiological signals for detection of heart sounds … an emotion recognition system using physiological signals. … On the other hand, people using caffeine were analysed …

… We assessed the mood, cognitive and physiological effects of a soft drink containing caffeine and glucose as well as flavouring levels of herbal extracts. The effects of different drink …

Coffee and tea are two of the most popular beverages in the world and have been consumed for more than a thousand years. They have become an integral part of the day for many consumers and may aid not only increased social interactions but also productivity. However, there is no conclusive evidence of their comparative effect on cognitive ability. This study investigated the impact of tea and coffee products on cognitive performance in typical office work-related tasks using brain, body, and behavioral measures. In a controlled multi-day study, we explored the effects of both traditional and cognition-enhancing hot beverages through task performance and self-reported measures. A total of 120 participants completed three work-related tasks from different cognitive domains and consumed either a traditional or cognition-enhancing hot beverage. During the study, we measured brain activity in the prefrontal cortex using functional near-infrared spectroscopy (fNIRS) as well as arousal from skin conductance through electrodermal activity (EDA) while participants completed cognitive tasks and consumed the beverages. Neural efficiency was used to evaluate cognitive performance in the tasks. Neural efficiency was calculated from a composite score of behavioral efficiency and cognitive effort, and emotional arousal was estimated from EDA activity. Results indicated that for different cognitive domains, the enhanced hot beverages showed improved neural efficiency over that of a traditional hot beverage. This is the first study to assess the impact of both traditional and cognition-enhancing drinks using a multimodal approach for workplace-related assignments.

… system, with increases in systolic and diastolic blood pressure as well as in heart rate (Lane 1983; Lane and Williams 1985), the present study aimed to vary systematically the mental …

… This study examined blood pressure, heart rate (HR), electromyogram (EMG). and skin conductance level (SCL) in 36 healthy men and women exposed to a pattern of moderate intake. …

… The effecis of caffeine and smoking on cognitive performance, subjective variables, heart rate, and EEG were assessed in two sessions. In one session, subjects received …

… dosages of caffeine-placebos together with the expectation of caffeine. The … , heart rate and blood pressure, well-being, as well as the subjective probability of having received caffeine. …

Coffee and tea are two beverages commonly-consumed around the world. Therefore, there is much research regarding their physiological effects. However, less is known about their psychological meanings. Derived from a predicted lay association between coffee and arousal, we posit that exposure to coffee-related cues should increase arousal, even in the absence of actual ingestion, relative to exposure to tea-related cues. We further suggest that higher arousal levels should facilitate a concrete level of mental construal as conceptualized by Construal Level Theory. In four experiments, we find that coffee cues prompted participants to see temporal distances as shorter and to think in more concrete, precise terms. Both subjective and physiological arousal explain the effects. We situate our work in the literature that connects food and beverage to cognition or decision-making. We also discuss the applied relevance of our results as coffee and tea are among the most prevalent beverages globally.

A growing body of literature suggests dietary components can support mood and cognitive function through the impact of their bioactive or sensorial properties on neural pathways. Of interest, objective measures of the autonomic nervous system—such as those regulating bodily functions related to heartbeat and sweating—can be used to assess the acute effects of dietary components on mood and cognitive function. Technological advancements in the development of portable and wearable devices have made it possible to collect autonomic responses in real-world settings, creating an opportunity to study how the intake of dietary components impacts mood and cognitive function at an individual level, day-to-day. In this paper, we aimed to review the use of autonomic nervous system responses such as heart rate or skin galvanic response to investigate the acute effects of dietary components on mood and cognitive performance in healthy adult populations. In addition to examining the existing methodologies, we also propose new state-of-the-art techniques that use autonomic nervous system responses to detect changes in proxy patterns for the automatic detection of stress, alertness, and cognitive performance. These methodologies have potential applications for home-based nutrition interventions and personalized nutrition, enabling individuals to recognize the specific dietary components that impact their mental and cognitive health and tailor their nutrition accordingly.

… regulates arousal and vigilance (Grilly, 1994). Thus caffeine is expected to increase arousal and … As such, the present study provides evidence that coffee consumption under "normal" …

… Effects of caffeine on mood of male and female subjects. (Mood scores are distances, in arbitrary units from 0 to 50, from the left-hand end of a bipolar scale, for example in the case …

… caffeine in food additives has the effect of providing a stable state and improving concentration, and excess caffeine intake … It has been also reported that depressive mood is decreased …

Abstract. Background: The market for energy drinks has grown quickly over the past 20 years. While the physiological and psychological effects of different ingredients have been studied, the influe...

… changes in autonomic nerve activity following caffeine intake … A beverage containing 240 mg of caffeine or a control … Heavy coffee drinkers report feelings of pleasant stimulation …