Although plants are essentially sessile in nature, these organisms are very much in tune with their environment and are capable of a variety of movements. This may come as a surprise to many non-botanists, but not to Charles Darwin, who reported that plants do produce movements. Following Darwin’s specific interest on climbing plants, this paper will focus on the attachment mechanisms by the tendrils. We draw attention to an unsolved problem in available literature: whether during the approach phase the tendrils of climbing plants consider the structure of the support they intend to grasp and plan the movement accordingly ahead of time. Here we report the first empirical evidence that this might be the case. The three-dimensional (3D) kinematic analysis of a climbing plant (Pisum sativum L.) demonstrates that the plant not only perceives the support, but it scales the kinematics of tendrils’ aperture according to its thickness. When the same support is represented in two-dimensions (2D), and thus unclimbable, there is no evidence for such scaling. In these circumstances the tendrils’ kinematics resemble those observed for the condition in which no support was offered. We discuss these data in light of the evidence suggesting that plants are equipped with sensory mechanisms able to provide the necessary information to plan and control a movement.

It may be simpler to consider well-being to be a unidimensional construct, as hypothesized, for example, by the Oxford Happiness Questionnaire (Hills & Argyle, 2002) or by the single-item measures proposed in several contexts (

Speed-accuracy trade-off (SAT) is the tendency for decision speed to covary with decision accuracy. SAT is an inescapable property of aimed movements being present in a wide range of species, from insects to primates. An aspect that remains unsolved is whether SAT extends to plants' movement. Here, we tested this possibility by examining the swaying in circles of the tips of shoots exhibited by climbing plants (Pisum sativum L.) as they approach to grasp a potential support. In particular, by means of three-dimensional kinematical analysis, we investigated whether climbing plants scale movement velocity as a function of the difficulty to coil a support. Results showed that plants are able to process the properties of the support before contact and, similarly to animal species, strategically modulate movement velocity according to task difficulty.

A rapid response to a threatening face in a crowd is important to successfully interact in social environments. Visual search tasks have been employed to determine whether there is a processing advantage for detecting an angry face in a crowd, compared to a happy face. The empirical findings supporting the ''anger superiority effect'' (ASE), however, have been criticized on the basis of possible lowlevel visual confounds and because of the limited ecological validity of the stimuli. Moreover, a ''happiness superiority effect'' is usually found with more realistic stimuli. In the present study, we tested the ASE by using dynamic (and static) images of realistic human faces, with validated emotional expressions having similar intensities, after controlling the bottom-up visual saliency and the amount of image motion. In five experiments, we found strong evidence for an ASE when using dynamic displays of facial expressions, but not when the emotions were expressed by static face images.Keywords: Anger superiority effect; Dynamic faces; Face-in-the-crowd effect; Face perception; Emotion.Evolutionary arguments may lead us to expect that threatening faces are detected more efficiently among a crowd of distractor faces than nonthreatening faces. Because facial threat provides a particularly potent social Please address all correspondence to Corrado Caudek, Department of Neuroscience, Psychology, Pharmacology, and Child's Health (NEUROFARBA), University of Florence, Via di San Salvi 12, Complesso di San Salvi, Padiglione 26, 50135 Firenze, Italy. E-mail: corrado.caudek@unifi.it These findings suggest that the ASE might be mediated by mechanisms that are summoned only in part (or not at all) by stimuli lacking the typical dynamic characteristics of facial emotion in natural settings.

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Research on hedonic and eudaimonic orientations has previously focused on their effects on well-being experiences. Very little is known about their associations with functioning. A preliminary objective of the study was to establish the factorial validity of the Hedonic and Eudaimonic Motives for Activities-Revised (HEMA-R) on an Italian sample (N = 461) through a confirmatory factor analysis. The main objective was to study the distinctive patterns of correlates between different types of orientations to well-being and several outcome measures of positive experiences (flourishing, life satisfaction, positive affect), negative experiences (negative affect, depression, anxiety, stress) and functioning (dispositional coping strategies) by means of a multivariate linear model. The Italian version of the HEMA-R showed a three-factor structure, namely eudaimonic, pleasure, and relaxation orientations. Pleasure orientation was positively related to positive experiences of wellbeing and negatively related to negative experiences. Eudaimonic orientation was associated with positive experiences. Furthermore, eudaimonic orientation showed a positive relation with several adaptive coping strategies, whereas relaxation was associated with avoidant coping strategies. The results reflect that pleasure orientation is aimed at achieving pleasant feelings, while Eudaimonic orientation is aimed at living well. Our findings also suggest that pleasure orientation may reflect the "pursuit of pleasure" component of Hedonia, while relaxation orientation may reflect its "pain avoidance" component. Overall, this study supports the importance of distinguishing between Eudaimonia, and the pleasure and relaxation components of Hedonia to predict individual differences in subjective experiences and functioning.

Tendrils are clasping structures used by climbing plants to anchor and support their vines that coil around suitable hosts to achieve the greatest exposure to sunlight. Although recent evidence suggests that climbing plants are able to sense the presence of a potential stimulus in the environment and to plan the tendrils' movements depending on properties such as its thickness, the mechanisms underlying thickness sensing in climbing plants have yet to be uncovered. The current research set out to use threedimensional kinematical analysis to investigate if and in what way the root system contributed to thickness sensing. Experiment 1 was designed to confirm that the movement of the tendrils of pea plants (Pisum sativum L.) is planned and controlled on the basis of stimulus thickness when the stimulus is inserted into the substrate. Experiment 2 was designed to investigate what happens when the stimulus is lifted to the ground so as to impede the root system from sensing it. The results confirmed that tendrils' kinematics depend on thickness when the stimulus is available to the root system but not when it is unavailable to it. These findings suggest that the root system plays a pivotal role in sensing the presence and the thickness of a stimulus and that the information perceived affects the planning and the execution of the climbing plants' reach-to-grasp movements.

In this article we adapt a methodology customarily used to investigate movement in animals to study the movement of plants. The targeted movement is circumnutation, a helical organ movement widespread among plants. It is variable due to a different magnitude of the trajectory (amplitude) exhibited by the organ tip, duration of one cycle (period), circular, elliptical, pendulum-like or irregular shape and the clockwise and counterclockwise direction of rotation. The acquisition setup consists of two cameras used to obtain a stereoscopic vision for each plant. Cameras switch to infrared recording mode for low light level conditions, allowing continuous motion acquisition during the night. A dedicated software enables semi-automatic tracking of key points of the plant and reconstructs the 3D trajectory of each point along the whole movement. Three-dimensional trajectories for different points undergo a specific processing to compute those features suitable to describe circumnutation (e.g., maximum speed, circumnutation center, circumnutation length, etc.). By applying our method to the approach-to-grasp movement exhibited by climbing plants (Pisum sativum L.) it appears clear that the plants scale movement kinematics according to the features of the support in ways that are adaptive, flexible, anticipatory and goal-directed, reminiscent of how animals would act.