Prior Expectations Research Articles

Trembling Meaning: Camera Instability and Gilbert Simondon's Transduction in Czech Archival Film

Many experimental found footage films base their meanings and effects on an interaction between the figurative content of the image and its material-technological underpinnings. Can this interaction arise accidentally without artistic appropriation? A recently digitised film by the Czech cinema pioneer Jan Kříženecký, Opening Ceremony of the Čech Bridge (1908), presents such an exercise in accidental aesthetics. At one point, the horizontal and vertical trembling of the cinematograph – obtained from the Lumière brothers – translates into a trembling of the figures on the bridge so precisely that the figurative and material spheres appear to cooperate towards a common aesthetic goal. To account for such phenomena, film theory, found footage filmmaking, and archival practice need to join forces with philosophy. More specifically, Gilbert Simondon's notion of transduction, a process based on the intersection of diverse realities within a domain, allows us to conceptualise the paradoxical interaction between the figurative and material dimensions and the unintentional meanings that arise out of it. Transduction enables the distribution of elements between these heterogeneous spheres while maintaining a certain stability within a system. In the case of archival films in which transduction occurs without prior intention or expectation, transduction can be foregrounded and prolonged. The connection between transduction and the “trembling meaning” of Opening Ceremony, understood within the wider context of camera instability in experimental found footage, will uncover the aesthetic potentialities held by the autonomous creativity of film matter and its interferences with the figurative content.

Scan path during change-detection visual search

When observing a particular image or object, one's perception depends upon prior expectations, memory, and cognitive abilities. It is hypothesized that cognitive processing in the form of top-down or bottom-up processing could be determined via analysis of the eye fixation scan path. To assess the variations in scan paths, 7 subjects underwent 5 change-detection trials. During each trial, they were presented with a specific set of images via a MATLAB program, in which the original image alternated with a modified image consisting of a single change. An open-source program called GazeRecorder was used to track the subject's eye movements and to record the eye fixations. The scan path was then analyzed through the use of a 4 by 4 grid pattern superimposed on the image to determine the subject's eye fixation distribution pattern in terms of Boxes Viewed and Concentration within a single area. It was determined that higher Concentration was positively correlated with faster Detection Speed (R = 0.84), while higher number of Boxes Viewed was negatively correlated with Detection Speed (R = −0.71). Among the subjects, the more optimal scan paths were found in those with a balance between Concentration and Boxes Viewed, as subjects with a more balanced approach had the greatest Accuracy (p = 0.02). This indicates an optimal scan path involves both top-down and bottom-up processing to more efficiently identify a change. Moreover, the methodology developed in this study could be used in the home or clinic for quantitative assessment of improvement following therapy in patients with neurological deficits.

A comparison of catchment travel times and storage deduced from deuterium and tritium tracers using StorAge Selection functions

Abstract. Catchment travel time distributions (TTDs) are an efficient concept for summarizing the time-varying 3D transport of water and solutes towards an outlet in a single function of a water age and for estimating catchment storage by leveraging information contained in tracer data (e.g., deuterium 2H and tritium 3H). It is argued that the preferential use of the stable isotopes of O and H as tracers, compared to tritium, has truncated our vision of streamflow TTDs, meaning that the long tails of the distribution associated with old water tend to be neglected. However, the reasons for the truncation of the TTD tails are still obscured by methodological and data limitations. In this study, we went beyond these limitations and evaluated the differences between streamflow TTDs calculated using only deuterium (2H) or only tritium (3H). We also compared mobile catchment storage (derived from the TTDs) associated with each tracer. For this, we additionally constrained a model that successfully simulated high-frequency stream deuterium measurements with 24 stream tritium measurements over the same period (2015–2017). We used data from the forested headwater Weierbach catchment (42 ha) in Luxembourg. Time-varying streamflow TTDs were estimated by consistently using both tracers within a framework based on StorAge Selection (SAS) functions. We found similar TTDs and similar mobile storage between the 2H- and 3H-derived estimates, despite statistically significant differences for certain measures of TTDs and storage. The streamflow mean travel time was estimated at 2.90±0.54 years, using 2H, and 3.12±0.59 years, using 3H (mean ± 1 SD – standard deviation). Both tracers consistently suggested that less than 10 % of the stream water in the Weierbach catchment is older than 5 years. The travel time differences between the tracers were small compared to previous studies in other catchments, and contrary to prior expectations, we found that these differences were more pronounced for young water than for old water. The found differences could be explained by the calculation uncertainties and by a limited sampling frequency for tritium. We conclude that stable isotopes do not seem to systematically underestimate travel times or storage compared to tritium. Using both stable and radioactive isotopes of H as tracers reduced the travel time and storage calculation uncertainties. Tritium and stable isotopes both had the ability to reveal short travel times in streamflow. Using both tracers together better exploited the more specific information about longer travel times that 3H inherently contains due to its radioactive decay. The two tracers thus had different information contents overall. Tritium was slightly more informative than stable isotopes for travel time analysis, despite a lower number of tracer samples. In the future, it would be useful to similarly test the consistency of travel time estimates and the potential differences in travel time information contents between those tracers in catchments with other characteristics, or with a considerable fraction of stream water older than 5 years, since this could emphasize the role of the radioactive decay of tritium in discriminating younger water from older water.

A predictive account of how novelty influences declarative memory

A rich body of studies in the human and non-human literature has examined the question how novelty influences memory. For a variety of different stimuli, ranging from simple objects and words to vastly complex scenarios, the literature reports that novelty improves memory in some cases, but impairs memory in other cases. In recent attempts to reconcile these conflicting findings, novelty has been divided into different subtypes, such as relative versus absolute novelty, or stimulus versus contextual novelty. Nevertheless, a single overarching theory of novelty and memory has been difficult to attain, probably due to the complexities in the interactions among stimuli, environmental factors (e.g., spatial and temporal context) and level of prior knowledge (but see Duszkiewicz et al., 2019; Kafkas & Montaldi, 2018b; Schomaker & Meeter, 2015). Here we describe how a predictive coding framework might be able to shed new light on different types of novelty and how they affect declarative memory in humans. More precisely, we consider how prior expectations modulate the influence of novelty on encoding episodes into memory, e.g., in terms of surprise, and how novelty/surprise affect memory for surrounding information. By reviewing a range of behavioural findings and their possible underlying neurobiological mechanisms, we highlight where a predictive coding framework succeeds and where it appears to struggle.

“Holy Cow, My Irony Detector Just Exploded!” Calling Out Irony During The Coronavirus Pandemic

ABSTRACT One of the compelling events during the 2020 spring coronavirus pandemic is the extent to which people call-out “irony” in regard to the speech and actions of other individuals, as well as, in some cases, their own behaviors. These frequent call-outs are evidence of the cognitive realization of some discrepancy between prior expectations and unfolding reality, but also reveal people’s communicative efforts to persuade others to adopt a negative view of those individuals who are responsible for the irony. This article explores several examples of irony call-outs in the context of both verbal irony and situational irony in the midst of the pandemic. My analysis suggests that what is considered to be “irony” always depends on the level of analysis from which such judgments are made. Irony may be salient from a personal point of view but non-ironic from a social/cultural perspective, and vice-versa. Our sense that an event is ironic may also change over time. Some call-outs of irony even focus on future “ironic opportunities” that would address different economic, environmental, and social justice challenges. These observations suggest several implications for theory and research on irony.

Carbon Beta: A Market-Based Measure of Climate Risk

Despite sustainable investments standing at record highs, it remains a challenge to quantify climate risk. We propose a proxy for a climate risk factor, the pollutive-minus-clean (PMC) portfolio, which captures differences in returns to firms that have high versus low corporate emissions. By regressing individual stock returns on the PMC factor, we obtain estimates of asset-level climate risk exposure: 'carbon beta'. Validation of carbon betas confirms that variation in climate risk exposures aligns with our prior expectations. Our measure has desirable properties regarding availability, coverage, and informativeness compared to conventional climate risk measures. We study the interaction of carbon betas with several proxies for realisations in climate risk. Returns to stocks with high carbon betas are lower during months in which climate change is more frequently discussed in the news, during months in which temperatures are abnormally high, and during exceptionally dry months. Unlike firm emissions and intensities, variation in carbon betas correlates with green patent issuance and forward-looking measures of climate risk.

The Search for Good Jobs: Evidence from a Six-year Field Experiment in Uganda

We present evidence from a six-year field experiment with young job seekers in urban labor markets in Uganda. We study how standard labor market interventions impact their search behavior, long run labor market outcomes, and how these long run outcomes are mediated through search behavior. The interventions we consider are the offer of vocational training, vocational training combined with job assistance, and job assistance only. Training is offered in sectors with high wage firms. Job assistance comprises a light touch offer to match workers for job interviews with such high wage firms. At baseline, youth are unskilled yet overly optimistic about their job prospects. Relative to controls, those offered vocational training become even more optimistic, search more intensively and direct their search towards higher quality firms. However, for youth additionally offered job assistance, expectations and search effort are revised downwards as call back rates from firms the workers are matched to, are far lower than their prior expectation. These differential search strategies impact long run outcomes: vocational trainees without job assistance have higher employment rates, longer employment spells, and end up in higher quality jobs and firms than workers additionally offered job assistance. Our analysis highlights how the potential for labor market entrants to be exuberant or discouraged both matter for long run outcomes through job search behavior. We discuss implications for the design and targeting of labor market interventions meant to help young people find good jobs.

A continuum hypothesis of psychotomimetic rapid antidepressants.

Ketamine, classical psychedelics and sleep deprivation are associated with rapid effects on depression. Interestingly, these interventions also have common psychotomimetic actions, mirroring aspects of psychosis such as an altered sense of self, perceptual distortions and distorted thinking. This raises the question whether these interventions might be acute antidepressants through the same mechanisms that underlie some of their psychotomimetic effects. That is, perhaps some symptoms of depression can be understood as occupying the opposite end of a spectrum where elements of psychosis can be found on the other side. This review aims at reviewing the evidence underlying a proposed continuum hypothesis of psychotomimetic rapid antidepressants, suggesting that a range of psychotomimetic interventions are also acute antidepressants as well as trying to explain these common features in a hierarchical predictive coding framework, where we hypothesise that these interventions share a common mechanism by increasing the flexibility of prior expectations. Neurobiological mechanisms at play and the role of different neuromodulatory systems affected by these interventions and their role in controlling the precision of prior expectations and new sensory evidence will be reviewed. The proposed hypothesis will also be discussed in relation to other existing theories of antidepressants. We also suggest a number of novel experiments to test the hypothesis and highlight research areas that could provide further insights, in the hope to better understand the acute antidepressant properties of these interventions.

Personality traits in citizen expectations towards public services

Prior expectations are an important determining factor of how citizens evaluate politicians, government and public services. Typically, citizen expectations are divided into two main categories: predictive (“will”) expectations and normative (“should”) expectations. Theories of expectations say that predictive expectations are the sterile and indifferent prediction of future events, while normative expectations have a foundation in personal norms and values and express how the world should look according to the individual. Therefore, normative expectations should have antecedents more closely related to the individual’s personality than predictive expectations. However, these theoretical claims regarding the nature of the two different expectation types have not yet been tested empirically. Examining broad personality traits (Big Five) and The Maximizing Tendency trait, this exploratory study analyzes whether different personality antecedents explain the two types of expectations. Results show that the personality traits agreeableness, conscientiousness, and openness correlate positively, and extraversion negatively, with normative expectations. None of the traits correlate with predictive expectations. These results have implications for politicians’ efforts to shape citizens’ expectations, the citizen satisfaction literature, including work considering the expectation-disconfirmation model, and for further research on citizen expectations.

Patient satisfaction and quality of life in hypothyroidism: An online survey by the british thyroid foundation.

Dissatisfaction with treatment and impaired quality of life (QOL) are reported among people with treated hypothyroidism. We aimed to gain insight into this. We conducted an online survey of individuals with self-reported hypothyroidism. Nine hundred sixty-nine responses were analysed. Dissatisfaction with treatment was common (77.6%), and overall QOL scores were low. Patient satisfaction did not correlate with type of thyroid hormone treatment, but treatment with combination levothyroxine (L-T4) and liothyronine (L-T3) or with desiccated thyroid extract (DTE) was associated with significantly better reported QOL than L-T4 or L-T3 monotherapies (P<.001); however, multivariate analysis inclusive of other clinical parameters failed to confirm an association between type of thyroid hormone treatment and QOL or satisfaction. Multivariate analysis showed positive correlations between satisfaction and age (P=.026), male gender (P=.011), being under the care of a thyroid specialist (P<.001), family doctor (GP) prescribing DTE or L-T4+L-T3 or L-T3 (P<.001) and being well informed about hypothyroidism (P<.001); negative correlations were observed between satisfaction and negative experiences with L-T4 (P<.001) and expectations for more support from the GP (P<.001), for L-T4 to resolve all symptoms (P=.004), and to be referred to a thyroid specialist (P<.001). For QOL, positive correlations were with male gender (P=.011) and duration of hypothyroidism (P=.002); negative correlations were with age (P=.027), visiting the GP more than 3 times before diagnosis (P<.001), sourcing DTE or L-T3 independently (P=.014), negative experiences with L-T4 (P=.013), having expectations for L-T4 to resolve all symptoms (P<.001) and of more support from the GP (P=.006). Multiple parameters including prior healthcare experiences and expectations influence satisfaction with hypothyroidism treatment and QOL. Focusing on enhancing the patient experience and clarifying expectations at diagnosis may improve satisfaction and QOL.

Visual statistical learning and integration of perceptual priors are intact in attention deficit hyperactivity disorder.

Deficits in visual statistical learning and predictive processing could in principle explain the key characteristics of inattention and distractibility in attention deficit hyperactivity disorder (ADHD). Specifically, from a Bayesian perspective, ADHD may be associated with flatter likelihoods (increased sensory processing noise), and/or difficulties in generating or using predictions. To our knowledge, such hypotheses have never been directly tested. We here test these hypotheses by evaluating whether adults diagnosed with ADHD (n = 17) differed from a control group (n = 30) in implicitly learning and using low-level perceptual priors to guide sensory processing. We used a visual statistical learning task in which participants had to estimate the direction of a cloud of coherently moving dots. Unbeknown to the participants, two of the directions were more frequently presented than the others, creating an implicit bias (prior) towards those directions. This task had previously revealed differences in other neurodevelopmental disorders, such as autistic spectrum disorder and schizophrenia. We found that both groups acquired the prior expectation for the most frequent directions and that these expectations substantially influenced task performance. Overall, there were no group differences in how much the priors influenced performance. However, subtle group differences were found in the influence of the prior over time. Our findings suggest that the symptoms of inattention and hyperactivity in ADHD do not stem from broad difficulties in developing and/or using low-level perceptual priors.

The (future) doctor will see you now: Piloting a longitudinal virtual patient in medical education, simulating general practice

Introduction Virtual patients provide numerous learning opportunities for medical students, yet only support one-off patient interactions. To emulate general practice, allowing multiple encounters with a single patient, a new longitudinal virtual patient (LVP) was developed. Methods The LVP was integrated into 2nd year at a graduate-entry medical school, in the 2019/2020 academic year. Students were asked about their prior experience and expectations of LVPs, before they engaged with two consultations and one results session. Data were collected from this survey and from the engagement with the LVP. Feedback was collected and thematically grouped. Results Survey responses indicated that 1.7% (2/120) had previous experience with virtual patients, and the majority expected the LVP to make a difference to their clinical reasoning. Out of the 142 students engaged with the LVP, 53% completed over 75% of the work. Informal feedback arose around accessibility, professional learning and development, and engagement with the LVP module. Discussion The data indicate that LVPs are agreeable to medical students, with good engagement and positive reports of clinical learning. Conclusion Future work exploring reasons of engagement or lack of, will support refinement of the LVP to accommodate the learning needs of the medical students.

Prior expectations evoke stimulus-specific activity in the deep layers of the primary visual cortex.

The way we perceive the world is strongly influenced by our expectations. In line with this, much recent research has revealed that prior expectations strongly modulate sensory processing. However, the neural circuitry through which the brain integrates external sensory inputs with internal expectation signals remains unknown. In order to understand the computational architecture of the cortex, we need to investigate the way these signals flow through the cortical layers. This is crucial because the different cortical layers have distinct intra- and interregional connectivity patterns, and therefore determining which layers are involved in a cortical computation can inform us on the sources and targets of these signals. Here, we used ultra-high field (7T) functional magnetic resonance imaging (fMRI) to reveal that prior expectations evoke stimulus-specific activity selectively in the deep layers of the primary visual cortex (V1). These findings are in line with predictive processing theories proposing that neurons in the deep cortical layers represent perceptual hypotheses and thereby shed light on the computational architecture of cortex.

Experiences and Psychological Influences in Lay Rescuers Performing Bystander Cardiopulmonary Resuscitation: A Qualitative Study.

Bystander-initiated cardiopulmonary resuscitation (CPR) and the use of automated external defibrillation (AED) is pivotal in the community chain of survival, but little is known regarding the bystander experience of performing CPR and AED, and their psychological infl uence from the incidents in the Asian community. This qualitative study was conducted to explore the experiences of lay rescuers who had performed CPR and AED in public locations in Taiwan. Lay rescuers who had provided initial CPR and defi brillation with AED in public locations across Taiwan in 2015 were selectively recruited from Taiwan Public AED Registry for a semi-structured interview. Nine participants were included in the study, and event-to-interview duration was within 1 year (n = 4) and 1-2 years (n = 5). The major fi ndings from the study were: (1) the lay rescuers possessed helping traits and high motivation; (2) the lay rescuers reported certain aspects of rescue reality that differed much from prior training and expectations, including diffi culty in the depth of chest compression, and uncertainties in real emergency situations; (3) the lay rescuers gained positive personal fulfi llment in sharing their experience and receiving positive feedback from others, and were willing to help next time, although they experienced a short-term negative psychological impact from the event. This study provides valuable information on strategies to increase layperson CPR rates and effectiveness in CPR training. Measures should be taken to increase layperson's confi dence and situation awareness, reduce training-reality discrepancy, build up a support system to avoid negative psychological effects, and prepare lay rescuers for the next resuscitation.

A model for user acceptance of robot journalism: Influence of positive disconfirmation and uncertainty avoidance

• We explored factors affecting acceptance of news articles by robot journalists. • Perceived quality on news by robots raises satisfaction towards them. • The satisfaction increases the intention to accept them. • Prior expectancy and uncertainty avoidance were added as factors. • The two attributes were featured as negative factors in this research model. This study explored factors affecting acceptance of news articles written by robot journalists. Until now, there has been little discussion about robot journalism in the perspective of user behavior, especially in terms of psychological and cultural factors influencing users’ intention to continue or discontinue consumption of news articles produced by robot journalists. According to the results of this study, perceived quality and positive disconfirmation on news by robot journalists raised satisfaction, which led to an increase in intention to accept robot journalism. Also, the role of prior expectation and uncertainty avoidance were explored. The lower the prior expectation, the stronger the effect of positive disconfirmation on satisfaction, and the higher uncertainty avoidance, the weaker the effect of satisfaction on intention to accept news by robot journalists.

User perceptions of powered wheelchair features.

There has been a substantial increase in recent years in the availability of powered wheelchairs and associated features. However, the psychological factors explaining feature use are poorly understood. The current study aims to explore this issue. Semi-structured interviews of 15 British wheelchairs users were conducted; all had a range of disabilities and clinically prescribed seating functions. Our aim was to explore participants’ perceptions in terms of engagement and use of their wheelchair technology. Interview schedules were generated based on prior research on psychological factors associated with health and well-being. Questions focused on participants’ knowledge of features and how to use them, perceived barriers and facilitating factors, motivation to use, and perceptions of social support. A theory led thematic analysis identified three themes: (a) clinical benefits and functional alternatives, (b) expectations versus reality, and (c) the impact of other people. There was diversity in the perceptions that users had of their equipment, with positive views of features linking to users’ experience of functional benefits and matches between equipment and prior expectations. Recommendations are made to highlight functional as well as clinical benefits, to explore therapists’ experiences of their practice, to consider how information could be presented, and to explore uses of social support and innovative technologies in future work.

Supplemental Material for User perceptions of powered wheelchair features.

There has been a substantial increase in recent years in the availability of powered wheelchairs and associated features. However, the psychological factors explaining feature use are poorly understood. The current study aims to explore this issue. Semi-structured interviews of 15 British wheelchairs users were conducted; all had a range of disabilities and clinically prescribed seating functions. Our aim was to explore participants’ perceptions in terms of engagement and use of their wheelchair technology. Interview schedules were generated based on prior research on psychological factors associated with health and well-being. Questions focused on participants’ knowledge of features and how to use them, perceived barriers and facilitating factors, motivation to use, and perceptions of social support. A theory led thematic analysis identified three themes: (a) clinical benefits and functional alternatives, (b) expectations versus reality, and (c) the impact of other people. There was diversity in the perceptions that users had of their equipment, with positive views of features linking to users’ experience of functional benefits and matches between equipment and prior expectations. Recommendations are made to highlight functional as well as clinical benefits, to explore therapists’ experiences of their practice, to consider how information could be presented, and to explore uses of social support and innovative technologies in future work.

The Computational, Pharmacological, and Physiological Determinants of Sensory Learning under Uncertainty

SummaryThe ability to represent and respond to uncertainty is fundamental to human cognition and decision-making. Noradrenaline (NA) is hypothesized to play a key role in coordinating the sensory, learning, and physiological states necessary to adapt to a changing world, but direct evidence for this is lacking in humans. Here, we tested the effects of attenuating noradrenergic neurotransmission on learning under uncertainty. We probed the effects of the β-adrenergic receptor antagonist propranolol (40 mg) using a between-subjects, double-blind, placebo-controlled design. Participants performed a probabilistic associative learning task, and we employed a hierarchical learning model to formally quantify prediction errors about cue-outcome contingencies and changes in these associations over time (volatility). Both unexpectedness and noise slowed down reaction times, but propranolol augmented the interaction between these main effects such that behavior was influenced more by prior expectations when uncertainty was high. Computationally, this was driven by a reduction in learning rates, with people slower to update their beliefs in the face of new information. Attenuating the global effects of NA also eliminated the phasic effects of prediction error and volatility on pupil size, consistent with slower belief updating. Finally, estimates of environmental volatility were predicted by baseline cardiac measures in all participants. Our results demonstrate that NA underpins behavioral and computational responses to uncertainty. These findings have important implications for understanding the impact of uncertainty on human biology and cognition.

Detecting (Un)seen Change: The Neural Underpinnings of (Un)conscious Prediction Errors.

Detecting changes in the environment is fundamental for our survival. According to predictive coding theory, detecting these irregularities relies both on incoming sensory information and our top–down prior expectations (or internal generative models) about the world. Prediction errors (PEs), detectable in event-related potentials (ERPs), occur when there is a mismatch between the sensory input and our internal model (i.e., a surprise event). Many changes occurring in our environment are irrelevant for survival and may remain unseen. Such changes, even if subtle, can nevertheless be detected by the brain without emerging into consciousness. What remains unclear is how these changes are processed in the brain at the network level. Here, we used a visual oddball paradigm in which participants engaged in a central letter task during electroencephalographic (EEG) recordings while presented with task-irrelevant high- or low-coherence background, random-dot motion. Critically, once in a while, the direction of the dots changed. After the EEG session, we confirmed that changes in motion direction at high- and low-coherence were visible and invisible, respectively, using psychophysical measurements. ERP analyses revealed that changes in motion direction elicited PE regardless of the visibility, but with distinct spatiotemporal patterns. To understand these responses, we applied dynamic causal modeling (DCM) to the EEG data. Bayesian Model Averaging showed visible PE relied on a release from adaptation (repetition suppression) within bilateral MT+, whereas invisible PE relied on adaptation at bilateral V1 (and left MT+). Furthermore, while feedforward upregulation was present for invisible PE, the visible change PE also included downregulation of feedback between right MT+ to V1. Our findings reveal a complex interplay of modulation in the generative network models underlying visible and invisible motion changes.

Relaxing and stimulating effects of odors on time perception and their modulation by expectancy.

Although several studies have reported relaxing and stimulating effects of odors on physiology and behavior, little is known about their underlying mechanisms. It has been proposed that participant expectancy could explain these activation effects. Since emotional stimuli are known to modulate time perception, here we used the temporal bisection task to determine whether odors have objective relaxing and stimulating effects by respectively slowing down or speeding up the internal clock and whether prior expectancy could alter these effects. In Experiment 1, 118 participants were presented either with a strawberry odor or an odorless blank. In Experiment 2, 132 participants were presented either with a lemon odor or an odorless blank. In both experiments, expectancy was manipulated using suggestion (verbal instructions). The stimulus was either described as relaxing or stimulating, or was not described. In the absence of prior suggestion, findings showed that, compared to participants presented with an odorless blank, participants presented with the strawberry odor underestimated sound durations (i.e., a relaxing effect) whereas participants presented with the lemon odor overestimated them (i.e., a stimulating effect). These results confirm that pleasant odors can have objective relaxing and stimulating effects by themselves, which are better explained by arousal-based mechanisms rather than attentional distraction. Furthermore, in both experiments, incongruent suggestions undid the effects of both odors without reversing them completely (i.e., strawberry did not become stimulating even if participants were told so). Both these bottom-up and top-down influences should be considered when investigating the emotional impact of odors on human behavior.