Are beliefs signals?

Eric Funkhouser argues that beliefs can function as social signals. I argue that Funkhouser’s argument for this conclusion rests on a problematic definition of “signal,” and that on standard definitions, the imperceptibility of beliefs disqualifies them from counting as signals. However, I also argue that Funkhouser’s insights about the social functions of beliefs can be true even if his claim that beliefs are signals is false.     

User perceptions and evaluations of short vibrotactile feedback

The objective of the present study was to provide a better understanding of the factors that influence discrimination and subjective assessment of vibrotactile feedbacks during active interaction with a touchscreen. Twenty-four participants were presented with 162 pairs of vibrotactile signals that varied in frequency (60 Hz, 130 Hz, 200 Hz), waveform (sine, square and triangle), and duration (around 123 ms for short and 163 ms for long). Participants had to complete three successive tasks: a dissimilarity task, a preference judgement task, and a resemblance (to push-buttons) judgement task. For the discrimination task, a MultiDimensional Scale analysis revealed: (1) a predominant role of frequency, (2) a role of duration for a given frequency, and (3) no role of waveform. An analysis of variance performed on the preference and resemblance data also point out the main role of the signal frequency. Finally, a correlation was found between preference and resemblance data, indicating that the participants tend to prefer signals judged to be similar to familiar tactile sensations.     

Actions speak louder than words: An elaborated theoretical model of the social functions of self-injury and other harmful behaviors

The question of why some people do things that are intentionally harmful to themselves continues to puzzle scientists, clinicians, and the public. Prior studies have demonstrated that one fairly extreme, direct form of self-harm, non-suicidal self-injury (NSSI), is maintained by both automatic (i.e., intrapersonal) as well as social (i.e., interpersonal) reinforcement. However, the majority of theoretical and empirical papers on this topic focus almost exclusively on the automatic functions. The purpose of this paper is to provide a more comprehensive analysis of the social functions of NSSI. Evidence is presented supporting the notion that NSSI is maintained by social reinforcement in at least a substantial minority of instances. Moreover, an elaborated theoretical model of the social functions of NSSI is outlined that proposes that this behavior represents a high intensity social signal used when less intense communication strategies fail (e.g., speaking, yelling, crying). The model further proposes that NSSI can serve not only as a signal of distress that is reinforced primarily by the caregiving behavior it elicits from others, but that it can also serve as a signal of strength and fitness that is reinforced by warding off potential threats (e.g., peer victimization), and in some cases can strengthen affiliation with others. Support for this theoretical model is drawn from diverse literatures including psychology, evolutionary biology, and cultural anthropology. The paper concludes with specific recommendations for empirical tests of the proposed model of the social functions of NSSI, as well as other harmful behaviors such as alcohol and drug use.     

不同飞机座舱噪声水平条件下双重听觉信号强度增量的研究

本研究用绝对辨认法与信号清晰度和响度适宜性主观评价测试了60、70和 80dB(A)三种噪声水平下与言语通讯同时呈现的高优先权音调信号的最小强度增量要求。研究结果表明 :在本实验设置的强度范围内 ,音调信号的辨认正确性主要取决于信号的相对强度 ;而音调信号的清晰度和响度适宜性与信号的绝对强度和相对强度都有关。对于采用信号强度自动增益控制的告警系统 ,这是一个值得注意的问题。     

Differential reinforcement-of-low-rate procedures: A systematic replication with students with autism spectrum disorder

Becraft, Borrero, Davis, Mendres-Smith, and Castillo (2018) studied the effects of two different types of DRL schedules (full session and spaced responding) under 2 sets of stimulus conditions (with and without signals). Reduced rates of responding maintained under both types of DRL schedules, when signals were included. The present study represents a replication of procedures by Becraft et al. involving learners with autism spectrum disorder (ASD). The results replicated those of Becraft et al. in that responding in both full-session and spaced-responding DRL schedules was low, but not eliminated. These results provide preliminary evidence to suggest that children with ASD are responsive to signals in DRL arrangements, which may set the stage for evaluation of signaled DRL arrangements for socially significant response forms.     

A practical variation of a multiple-schedule procedure: brief schedule-correlated stimuli

Multiple schedules using continuous discriminative stimuli have been used to minimize children's disruptive requesting for teacher attention (e.g., colored floral leis; Tiger & Hanley, 2004; Tiger, Hanley, & Heal, 2006). The present study evaluated the effectiveness of, and children's preferences for, two multiple-schedule arrangements in which brief experimenter vocalizations served as discriminative stimuli. Results showed that brief signals were highly effective discriminative stimuli for 3 of the 4 children, and that all children preferred one or both variations of the multiple schedule to a control arrangement. For 1 child, highly discriminated responding was achieved only when continuous signals were introduced.     

An adaptive perspective on revealed and concealed cues to empathy

Wu, Sheppard, and Mitchell (Br. J. Psychol., 2016; 107, 1‐22) found that observers could accurately identify people with extreme but not more average empathy scores. Here, we further consider this U‐shaped discrimination function. We first examine a statistical issue regarding the construction of the average groups, which are less homogenous by definition than the extreme groups. We then consider the kinds of questions arising when these results are considered within the adaptive framework of signal theory. Some interesting questions arise relating to the signal sender, including the costs and benefits to the sender in revealing and concealing true empathy levels, and the effects of adopting behavioural norms to conceal true levels of empathy.     

Two-factor theory has strong empirical evidence of validity.

Traditional two-factor theory is supported by parallels in the clinical literature. Theoretical problems with two-factor theory are obviated by the role of safety signals, which serve as positive conditioned reinforcers and retard the extinction of conditioned fear.     

Observing shared attention modulates gaze following

Humans’ tendency to follow others’ gaze is considered to be rather resistant to top-down influences. However, recent evidence indicates that gaze following depends on prior eye contact with the observed agent. Does observing two people engaging in eye contact also modulate gaze following? Participants observed two faces looking at each other or away from each other before jointly shifting gaze to one of two locations. Targets appeared either at the cued location or at the non-cued location. In three experiments gaze cueing effects (faster responses to objects appearing at the cued location) were found only when the two faces had looked at each other before shifting gaze. In contrast, no effects of gaze following were observed when the two faces had looked away from each other. Thus, the attentional relation between observed people modulates whether their gaze is followed.