Increasing and decreasing motor and cognitive output: a model of general action and inaction goals

General action and inaction goals can influence the amount of motor or cognitive output irrespective of the type of behavior in question, with the same stimuli producing trivial and important motor and cognitive manifestations normally viewed as parts of different systems. A series of experiments examined the effects of instilling general action and inaction goals using word primes, such as "action" and "rest." The first 5 experiments showed that the same stimuli influenced motor output, such as doodling on a piece of paper and eating, as well as cognitive output, such as recall and problem solving. The last 2 experiments supported the prediction that these diverse effects can result from the instigation of general action and inaction goals. Specifically, these last 2 studies confirmed that participants were motivated to achieve active or inactive states and that attaining them decreased the effects of the primes on behavior.     

Latency of saccadic eye movement during contraction of bilateral and unilateral shoulder girdle elevators

We compared the timed latencies of saccadic eye movement during isometric contraction of the bilateral and unilateral shoulder girdle elevators in a sitting posture. Muscle contraction force was increased in 10% increments from 0% to 60% of the maximal voluntary contraction (MVC) of each side. Saccadic latency was measured as the latency to the beginning of eye movement toward the lateral target that was moved at random intervals in 20 degree amplitude jumps. Eye movement was measured using the electro-oculogram technique. During bilateral contraction, saccadic latency decreased until 30% MVC and then began to increase at 40% MVC. During unilateral contraction, saccadic latency decreased until 30% MVC in a similar pattern as in bilateral condition, was constant from 30% MVC to 50% MVC, followed by a slight increase at 60% MVC. The saccadic latencies at 10% and 40-60% MVC were significantly shorter during unilateral contraction than bilateral contraction. Thus, the relative force for producing a marked shortening of saccadic latency is observed within a wider range during unilateral contraction than bilateral contraction.     

Critical evidence: a test of the critical-period hypothesis for second-language acquisition

The critical-period hypothesis for second-language acquisition was tested on data from the 1990 U.S. Census using responses from 2.3 million immigrants with Spanish or Chinese language backgrounds. The analyses tested a key prediction of the hypothesis, namely, that the line regressing second-language attainment on age of immigration would be markedly different on either side of the critical-age point. Predictions tested were that there would be a difference in slope, a difference in the mean while controlling for slope, or both. The results showed large linear effects for level of education and for age of immigration, but a negligible amount of additional variance was accounted for when the parameters for difference in slope and difference in means were estimated. Thus, the pattern of decline in second-language acquisition failed to produce the discontinuity that is an essential hallmark of a critical period.     

Textural properties corresponding to visual perception based on the correlation mechanism in the visual system

We present a set of texture parameters that correspond to perceptual properties of visual texture. For machine vision or a computer interface, it is important that the computational measurements of texture correspond well to the perceptual properties. To understand the mechanism of our visual system, it is important to know how we extract or characterize information for texture perception. In this study, we show that the autocorrelation function (ACF) analysis provides useful measures for representing three salient perceptual properties of texture: contrast, coarseness, and regularity. The validity of the ACF analysis was examined by comparing the calculated factors to the subjective scores collected for various kinds of natural textures. The effectiveness of the analysis depends on the structure of the estimated ACF. When a texture has a harmonic structure, the estimated ACF has periodical peaks corresponding to the periods of the texture. Both perceived coarseness and regularity are strongly related to these peaks in the ACF. However, the estimated ACF does not have a periodical structure when the texture is random. In this case, the texture coarseness and regularity are represented by the decay rate of the ACF.     

The missing fundamental phenomenon in temporal vision

Subjective flicker rates were measured for compound waveforms consisting of five harmonics without a fundamental component. It was found that observers perceived a rate at the fundamental frequency, although energy at this frequency was not included in the signals. In auditory pitch sensation this is called the missing fundamental phenomenon, and an analogous finding is known to occur in spatial vision. Moreover, observers perceived the flicker rates at the fundamental frequency even in the random-phase conditions, in which the period of the fundamental component is unclear in the real waveforms. The results indicate that the perceived flicker rates are not detected from the temporal waveforms per se. One possible mechanism for extracting such a periodicity in the signal is an autocorrelation function to the real temporal waveforms. Received: 18 October 1999 / Accepted: 28 January 2000     

Chemical ordering of Co and Ni in a W-(AlCoNi) crystalline approximant related to Al–Co–Ni decagonal quasicrystals studied by atomic resolution energy-dispersive X-ray spectroscopy

A W-(AlCoNi) crystalline approximant, which is closely related to Al–Co–Ni decagonal quasicrystals, in an Al_72.5Co₂₀Ni_7.5 alloy has been studied by atomic resolution energy-dispersive X-ray spectroscopy (EDS), in an instrument attached to a spherical aberration (Cs)-corrected scanning transmission electron microscope. On high-resolution EDS maps of Co and Ni elements, obtained by integrating many sets of EDS data taken from undamaged areas, chemical ordering of Co and Ni is clearly detected. In the structure of the W-(AlCoNi) phase, consisting of arrangements of transition-metal (TM) atoms located at vertices of pentagonal tilings and pentagonal arrangements of mixed sites (MSs) of TM and Al atoms, Co atoms occupy the TM atom positions with the pentagonal tiling and Ni is enriched in part of the pentagonal arrangements of MSs.     

Extended Quantum Logic

The concept of quantum logic is extended so that it covers a more general set of propositions that involve non-trivial probabilities. This structure is shown to be embedded into a multi-modal framework, which has desirable logical properties such as an axiomatization, the finite model property and decidability.     

Changes in the Frequency of Coworker Incivility: Roles of Work Hours,Workplace Sex Ratio,Supervisor Leadership Style,and Incivility

Previous research has identified individual characteristics that affect experiences of coworker incivility. However, much less is known about environmental characteristics that affect these experiences. Drawing on the social learning theory and the frustration–aggression hypothesis, this study examined the effects of supervisor incivility and work hours on coworker incivility. Data collected from 692 full-time employees showed that changes in the frequency of supervisor incivility positively predicted changes in the frequency of coworker incivility over the next 6-month period. This relationship tended to be stronger for employees who had a supervisor lower rather than higher in the levels of autocratic leadership style. Furthermore, changes in work hours positively predicted changes in coworker incivility. The workplace sex ratio was not an important factor that differentiated experiences of coworker incivility for either men or women. The results of this study highlight the importance of attending to the environmental characteristics of the workplace to understand the occurrence of coworker incivility.     

Meanings of Loss Among Japanese Suicide Bereaved: Content Analysis of Open-Ended Responses1

Although the importance of meaning-making among suicide bereaved has been reported, the detailed contents of the process remain unclear. This study aimed to identify the content categories of sense-making and benefit-finding in Japanese suicide loss survivors. We conducted content analysis of responses to open-ended questions in 99 participants. The results indicated that sense-making activities comprised seven categories, including Deceased was relieved from pain and Suicide is inevitable in modern society. Benefit-finding also comprised eight categories, such as Treat others with compassion and Live one day at a time with gratitude. The implications of the results are discussed in terms of sociocultural contexts of suicide postvention.