Video feedback (VF) has been widely integrated into cognitive behavioural treatment protocols for socially anxious individuals due to its presumed efficacy in improving negative self-perception and reducing underestimations of performance. However, studies examining VF in social anxiety reveal, surprisingly, that correction of overly negative self-perception does not unequivocally facilitate anxiety reduction during subsequent social interactions. In the current study, we examined whether VF could be optimized to facilitate social anxiety reduction through the inclusion of a post-VF encoding manipulation. The manipulation was designed to enable individuals to internalize the positive information received from VF by enhancing the depth at which they processed the self-exposure information. Forty-three individuals high in social anxiety and verbal communication anxiety were randomly assigned to one of the following three conditions: A) VF + Manipulation; B) VF + No Manipulation; and C) No VF. Results revealed that VF + Manipulation led to significant cognitive changes pertaining to self-efficacy and internal attributions of performance relative to the other two conditions. Unexpectedly, both VF conditions were equally efficacious in the facilitation of anxiety reduction relative to the No VF condition. Results are discussed in the context of cognitive behavioural models of anxiety and the mechanisms of exposure-based learning.

Video feedback (VF) has been widely integrated into cognitive behavioural treatment protocols for socially anxious individuals due to its presumed efficacy in improving negative self-perception and reducing underestimations of performance. However, studies examining VF in social anxiety reveal, surprisingly, that correction of overly negative self-perception does not unequivocally facilitate anxiety reduction during subsequent social interactions. In the current study, we examined whether VF could be optimized to facilitate social anxiety reduction through the inclusion of a post-VF encoding manipulation. The manipulation was designed to enable individuals to internalize the positive information received from VF by enhancing the depth at which they processed the self-exposure information. Forty-three individuals high in social anxiety and verbal communication anxiety were randomly assigned to one of the following three conditions: A) VF + Manipulation; B) VF + No Manipulation; and C) No VF. Results revealed that VF + Manipulation led to significant cognitive changes pertaining to self-efficacy and internal attributions of performance relative to the other two conditions. Unexpectedly, both VF conditions were equally efficacious in the facilitation of anxiety reduction relative to the No VF condition. Results are discussed in the context of cognitive behavioural models of anxiety and the mechanisms of exposure-based learning.

Video feedback (VF) has been widely integrated into cognitive behavioural treatment protocols for socially anxious individuals due to its presumed efficacy in improving negative self-perception and reducing underestimations of performance. However, studies examining VF in social anxiety reveal, surprisingly, that correction of overly negative self-perception does not unequivocally facilitate anxiety reduction during subsequent social interactions. In the current study, we examined whether VF could be optimized to facilitate social anxiety reduction through the inclusion of a post-VF encoding manipulation. The manipulation was designed to enable individuals to internalize the positive information received from VF by enhancing the depth at which they processed the self-exposure information. Forty-three individuals high in social anxiety and verbal communication anxiety were randomly assigned to one of the following three conditions: A) VF + Manipulation; B) VF + No Manipulation; and C) No VF. Results revealed that VF + Manipulation led to significant cognitive changes pertaining to self-efficacy and internal attributions of performance relative to the other two conditions. Unexpectedly, both VF conditions were equally efficacious in the facilitation of anxiety reduction relative to the No VF condition. Results are discussed in the context of cognitive behavioural models of anxiety and the mechanisms of exposure-based learning.

Abstract Aim: The aim of this study was to investigate how neural mechanisms operate during maximum strength training in the Quadriceps Femoris muscle group. One of the main objectives is to investigate the effects of five weeks unilateral maximum eccentric strength training on contralateral neural adaptations. The second is to investigate the effects of adding electromyographic (EMG) biofeedback into the training intervention.  Method: 20 healthy, recreationally active men and women had to undergo five weeks (three training sessions per week, resulting in 15 sessions in total) of maximum isokinetic unilateral eccentric strength training of the Quadriceps femoris muscle, with EMG biofeedback; FBG, n=10 five women and five men, or without EMG biofeedback; RTG n=10 five women and five men. The study was performed at the Laboratory of Biomechanics and Motor control, BMC Laboratory, Stockholm Sweden. Results: The results demonstrated an increase in concentric strength development in the trained leg; before 130 ± 43 Nm and after training 148 ± 46 Nm, (p=0.006). No significant increase in strength was detected for the untrained leg. Further, post hoc tests showed a tendency towards an increase in level of activation (LOA) of the trained leg in the FBG; from 69 ± 15 % before to 81 ± 13 % after training (p=0.097). No significant differences in the ecc:con EMG-ratio or in antagonist co-activation after the training intervention were shown. Conclusion: No significant difference in strength development was shown, whether training occurred with or without EMG biofeedback. However, eccentric training tended to induce transfer of neural activation to a maximum voluntary contraction (MVC) in the trained leg only in the group training with EMG biofeedback. In addition, the results revealed that eccentric strength training improved concentric strength in the trained leg but induced no transfer to the contralateral untrained leg. The benefits and prospects with incorporating feedback into training remains somewhat unknown and requires further research to obtain deeper understanding of the neural mechanisms affected by biofeedback.

Denna studie undersöker hur antalet konjunktionsfel påverkas av feedback av varierande komplexitet. Ett konjunktionsfel uppstår när en sammansatt händelse A&B bedöms som mer sannolik än någon av de ingående händelserna A eller B. Ett datorbaserat experiment med 45 deltagare fördelade på tre betingelser (Singel, Trippel, Mix) kördes. I en träningsfas bedömde deltagarna utgången på spelkuponger innehållande en fotbollsmatch (Singel), tre fotbollsmatcher (Trippel) eller både en och tre fotbollsmatcher (Mix) och fick feedback på bedömningarna. I en testfas gjorde alla deltagarna bedömningar av sannolikheten för vinst på spelkuponger med en eller tre fotbollsmatcher. Resultaten visar på att en komplex feedback, av både komponenter och konjunktioner, reducerar proportionen konjunktionsfel mer än feedback av bara komponenter eller konjunktioner. Dock är konjunktionsfelet robust, trots att försöksdeltagare får feedback och har kunskap om sannolikheter för konjunktioner och komponenter.

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The aim of the study was to gain a better understanding of how some people aged between 20-35 years’ experience Facebook in relation to identity creation, communication and stress. The analysis is drawn from seven semi-structured interviews with a sample of Facebook members, four women and three men aged 20-35 years and during the interviews respondents answered questions based by the following topics. Does Facebook allow changing identities? In what way is Facebook a communication tool for enabling relationships? How can Facebook be related to stress and coping? The results showed that respondents perceived Facebook as an easy means of communication and maintaining relationships. Facebook enables and facilitates in the creating of ones desired image of ones own identity. Facebook experienced by the interviewees as a context which explored a desire to constantly take note of what happens, which in turn contributes to increased levels of stress. The paper also discusses issues such as alternative realities, expected feedback, changing identities and living in the present. / Syftet med studien var att få en större förståelse för hur några personer i åldern 20-35 år, upplevde Facebook med dess relation till identitet, kommunikation och stress. Metodologiskt har en semistrukturerad intervjumetod legat till grund för studiens procedur. Urvalet bestod av fyra kvinnor och tre män. Studien baserades på följande frågeställningar: Möjliggör Facebook för växlande identiteter? På vilket sätt är Facebook ett kommunikationsredskap för möjliggörande av relationer? På vilket sätt kan Facebook ha en relation till stress? Resultatet visade att intervjupersonerna upplevde Facebook som ett enkelt verktyg för kommunikation och upprätthållande av relationer. Facebook möjliggör och underlättade att skapa en önskad bild av sin egen identitet. Facebook upplevdes också bidra till en önskan att ständigt ta del av vad som händer. Men att ständigt vara uppkopplad och ta del av vad andra gör kan bidra till stress. Diskussionen berörde aspekterna: en alternativ värld, förväntad feedback, växlande identiteter samt upplevelser av att leva i nuet.

Input shaping and Proportional-Integral-Derivative (PID) feedback control are simple, easy-to-implement and generally low cost control strategies. Considering this, it is remarkable that they are also very effective control techniques. In fact, a majority of the world's feedback controllers utilize PID (or the subset PD) control. In addition, input shaping has seen significant use on real-world machines such as cranes, micro-mills, coordinate measuring machines, computer disc drive manufacturing machines, spacecraft, etc. However, despite similarities in effectiveness and ease of implementation, input shaping and PID feedback control are fundamentally different strategies. Input shaping is an anticipatory control scheme capable of enabling quick, low-vibration motions. PID feedback control is reactive in nature, and it is primarily required to deal with problems such as modeling errors, disturbances and nonlinearities. Of course, PID control is also used to reduce vibrations (as in the case of input shaping). But, because it is a reactive controller, it is slower than input shaping at eliminating motion-induced vibration. Given their effectiveness and practicality, as well as the fact that they address important and complimentary control issues, it would be advantageous to combine these two control strategies. The result would still be practical and effective, yet would now address a range of system phenomenon beyond that which is capable by either of the individual control techniques. However, there is a definite gap in the state-of-the-art technology for combining these techniques. For example, little research has addressed the intelligent combination of traditional, outside-the-loop input shaping and PID feedback control. In addition, only a few researchers have attempted to place input shaping filters within feedback loops. This research studies the intelligent combination of input shaping and PID feedback control by developing a concurrent design procedure for outside-the-loop input shaping/PID feedback combinations and by analyzing the effect of placing input shaping filters within feedback loops.

The availability of feedback in communication channels can significantly increase the reliability of transmission while decreasing the encoding and decoding complexity. Most of the applications like cellular telephony, satellite communications and internet involve two-way transmission. Hence, it is important to devise coding schemes which utilize the advantages of feedback. Most of the results in code designs, which make use of feedback, concentrate on noiseless and instantaneous feedback. But in real-time systems, the feedback is usually noisy, and is available at the transmitter after some delay. Hence, it is important that we characterize the gains obtained in this case over that of one-way channels. We consider binary erasure channels to keep the problem tractable. For the erasure channels with noisy feedback, we have designed and analyzed a concatenated coding scheme, which achieves lower probability of error than any forward error correcting code of the same rate. Hence, it is shown that even noisy feedback can be useful in increasing the reliability of the channel. We have designed and analyzed a coding scheme using Low Density Parity Check (LDPC) codes along with selective retransmission strategy, which utilizes the limited (but noiseless), delayed feedback to achieve low frame error rates even with small blocklengths, at rates close to capacity. Furthermore, our scheme provides a way to trade off feedback bandwidth for reliability. The complexity of this scheme is lower than that of a forward error correcting code (FEC) of same blocklength and comparable performance. We have shown that our scheme performs better than the Automatic Repeat Request (ARQ) protocol which makes use of 1 bit feedback to signal retransmissions. For fair comparisons, we have also incorporated the rate loss due to the bits which are fed back in addition to the retransmitted bits. Thus, we have shown that for two-way communications with complexity and delay constraints, it is better to utilize the availability of feedback than to use just FEC.

The majority of empirical research on responses to negative feedback has focused on affective responses to negative feedback, which have largely been adverse. The purpose of this study was to examine how negative feedback enhances motivation. A key feature of this study is the conceptualization of motivation using Edward Deci and Richard Ryan’s self-determination theory. Self-determination theory proposes a continuum of motivation, based on one’s regulation, or contingency for performance. Goal orientation and social dominance orientation are proposed as two moderators of the negative feedback-regulation relationship. Two studies were conducted to examine the relationship between negative feedback and regulation. Study 1 used a survey-based instrument with a work sample after a performance appraisal was conducted (N = 221), and Study 2 took place in a psychology statistics undergraduate course (N = 156). Negative feedback yielded a decrease in obligated motivation in Study 1. Mastery prove goal orientation and performance prove goal orientation were consistent significant moderators of the negative feedback-regulation relationship, such that individuals with high levels of Mastery prove goal orientation increased their autonomous regulation at higher levels of negative feedback, while individuals with high levels of performance prove goal orientation decreased their autonomous regulation at higher levels of negative feedback. Implications for feedback delivery are discussed. This study contributes to the literature by being the first to examine the effects of negative feedback on all forms of regulation, and is the first to use goal orientation and social dominance orientation as moderators of the negative feedback – regulation relationship. Further, this study demonstrated the positive motivational effects of giving positive feedback as well as setting mastery prove based goals.