High-power States Research Articles

Probabilistic, entropy-maximizing control of large-scale neural synchronization.

Oscillatory neural activity is dynamically controlled to coordinate perceptual, attentional and cognitive processes. On the macroscopic scale, this control is reflected in the U-shaped deviations of EEG spectral-power dynamics from stochastic dynamics, characterized by disproportionately elevated occurrences of the lowest and highest ranges of power. To understand the mechanisms that generate these low- and high-power states, we fit a simple mathematical model of synchronization of oscillatory activity to human EEG data. The results consistently indicated that the majority (~95%) of synchronization dynamics is controlled by slowly adjusting the probability of synchronization while maintaining maximum entropy within the timescale of a few seconds. This strategy appears to be universal as the results generalized across oscillation frequencies, EEG current sources, and participants (N = 52) whether they rested with their eyes closed, rested with their eyes open in a darkened room, or viewed a silent nature video. Given that precisely coordinated behavior requires tightly controlled oscillatory dynamics, the current results suggest that the large-scale spatial synchronization of oscillatory activity is controlled by the relatively slow, entropy-maximizing adjustments of synchronization probability (demonstrated here) in combination with temporally precise phase adjustments (e.g., phase resetting generated by sensorimotor interactions). Interestingly, we observed a modest but consistent spatial pattern of deviations from the maximum-entropy rule, potentially suggesting that the mid-central-posterior region serves as an "entropy dump" to facilitate the temporally precise control of spectral-power dynamics in the surrounding regions.

Comment on ‘Heating of Enceladus due to the dissipation of ocean tides’ by R. Tyler

Dissipation of ocean potential energy is proposed by Tyler (2020) as a new mechanism leading to possible high-power states for Enceladus. I show here that this process actually results from viscoelastic dissipation within the crust. For plausible values of Enceladus’s ocean thickness, crustal dissipation can be computed with the standard approach of static deformations of solid layers by equilibrium tides.

Celebrity influence on word of mouth: the interplay of power states and power expectations

Despite the widespread use of celebrity endorsers to stimulate word of mouth in marketing practice, surprisingly little academic research investigates factors that influence consumers to spread word of mouth about celebrity-endorsed brands. In accord with compensatory consumer behavior research on consumer power states, we find that consumers in low-power states report stronger intentions to spread word of mouth about a brand that is celebrity-, compared to model-, endorsed, and that consumers in low-power states report stronger intentions to spread word of mouth about celebrity-endorsed brands than consumers in high-power states. However, consumers in high-power states can be encouraged to spread word of mouth about celebrity-endorsed brands when the endorsement message communicates high-power expectations, because such messages are easier to process. Consumers in high-power states seek to conform to expectations of how powerful people behave, and spread word of mouth in order to self-verify their power state. Consumers in low-power states are attuned to status cues that facilitate perceptions of the brand as possessing referent power, and spread word of mouth in order to remedy the aversive nature of feeling powerless.

How recipient group membership affects the effect of power states on prosocial behaviors

Understanding and encouraging motivation for prosocial behavior is an important issue. This research shows that recipient group membership moderates the effect of power on prosocial behavior. Across four studies using different manipulations of power, different samples, and various scenarios, we find that consumers in high-power states show a similar tendency to assist in-group and out-group recipients. However, consumers in low-power states are more likely to help in-group recipients (Study 2 & 4). We further find that consumers in low-power states help others to meet their reciprocity motive, and helping in-group rather than out-group members can satisfy this motive. This difference is less salient for high-power consumers because they help others to satisfy their self-enhancement motive (Study 1 & 3). The findings are helpful to understand people’s distinctions in prosocial conduct.

All-optical switching and flip-flop based on dynamically controlled bistability in a V-type atomic system

We have proposed a scheme for all-optical switching and flip-flop based on controllable optical bistability in a simple three-level V-type atomic system assisted by an incoherent pump field. Due to the auxiliary incoherent pump, the atomic population is redistributed in the three levels, and then the absorption-dispersion property and the Kerr nonlinearity of the medium are different from those of the conventional V-type electromagnetically induced transparency system. The results show that both the thresholds and the area (or shape) of the hysteresis loop can be controlled efficiently via the adjustment of either the incoherent pump field or the coupling field. As a result, with a constant cavity input, the output of the optical cavity can be switched between the low- and high-power states of different bistable curves by tuning the optical fields. Based on this effect, we realize all-optical steady-state switching and set-reset flip-flop operation by adding a pulse sequence (positive pulse or set-reset pulse) onto either the incoherent pump field or the coupling field. Such a simple and effective technique of optical switching and flip-flop can find application in all-optical signal processing systems.

How power states and others’ statuses influence status consumption: The role of signaling effectiveness

This research aims to examine how power states and others’ statuses interact to influence status consumption. Specifically, consumers in low-power states are more inclined to engage in status consumption than those in high-power states when others’ statuses are superior. However, consumers in high-power states are more inclined to engage in status consumption than those in low-power states when others’ statuses are inferior. Signaling effectiveness plays a mediating role in the interaction effect of power states and others’ statuses on status consumption. Two studies were conducted to test our hypotheses. Study 1 tested how others’ statuses moderate the effects of power states on status consumption and how signaling effectiveness mediates the moderating role of others’ statuses on the effects of power states on status consumption. Study 2 further tested the two hypotheses in a different scenario through the sense of the power scale used to measure the power state. This research confirms the effects of power states on status consumption depending on others’ statuses and the fundamental mechanism of status consumption. The theoretical contributions and practical implications are of value for both researchers and managers.

Dynamics of Communicator and Audience Power: The Persuasiveness of Competence versus Warmth

Abstract The current research offers a new theoretical perspective on the relationship between power and persuasion. An agentic-communal model of power is presented that proposes power affects both the messages generated by communicators and the messages that persuade audiences. Compared to low-power states, high-power states produce a greater emphasis on information that conveys competence. As a consequence, high-power communicators generate messages with greater competence information, and high-power audiences are persuaded more by competence information. In contrast to high-power states, low-power states produce a greater emphasis on information that conveys warmth. As a result, low-power communicators generate messages with greater warmth information, and low-power audiences are persuaded more by warmth information. Because of these two outcomes, a power-matching effect occurs between communicator and audience power: high-power communicators are more effective in persuading high-power audience members, whereas low-power communicators are more effective in persuading low-power audience members. Four experiments find support for these effects in oral and written contexts with three distinct manipulations of power. Overall, these experiments demonstrate that the persuasiveness of messages can be affected by the alignment between the psychological sense of power of the communicator and the audience.

All-optical phase-preserving multilevel amplitude regeneration.

The possibility of all-optical phase-preserving amplitude regeneration for star-8QAM is demonstrated using a modified nonlinear optical loop mirror. Experiments show a reduction in amplitude noise on both amplitude levels simultaneously, considering two different types of signal distortions: deterministic low-frequency amplitude modulation and broadband amplitude noise. Furthermore, using this amplitude regeneration, the robustness against nonlinear phase noise from fiber nonlinearity in a transmission line is increased. The scheme suppresses the conversion of amplitude noise to nonlinear phase noise. This is shown for simultaneous amplitude regeneration of the two amplitude states as well as for amplitude regeneration of the high-power states only. If the transmission is limited by nonlinear phase noise, single-level operation at the more critical higher-power state will benefit because of the wider plateau region. Numerical simulations confirm the experimental results.

All-Optical Simultaneous Multilevel Amplitude and Phase Regeneration

Simultaneous amplitude and phase noise reduction of multiple signal states using a nonlinear amplifying loop mirror with integrated directional phase-sensitive amplifier are presented for the star-eight quadrature amplitude modulation transmission format as an example. The performance of this combined regenerator scheme is compared with that of a cascade of separate phase and amplitude regenerators. It could be shown that an improvement in the error vector magnitude of 4 dB for the high-power states with simultaneous improvement of 5 dB for the low-power states is possible in both cases. Transmission improvement by regeneration is considered for two noise types: 1) amplified spontaneous emission and 2) nonlinear phase noise. Both schemes can either improve the bit error rate by an order of magnitude or enable an increase of the fiber launch power by 3 dB.