Spatial extent and figural factors in backward masking

Spatial and figural characteristics of backward masking were studied, with two collinear arcs presented end-to-end and serving as target and mask, respectively. Stimulus onset asynchrony was 50 ms while interstimulus interval was 0 ms. Mask exposure duration required for masking was determined as a function of target length with mask length as a parameter. The exposure duration of the mask required for complete masking varied directly with target length, but inversely with mask length. The fact that masking strength increased with mask duration while all other parameters were kept constant suggests that masking depended on stimulus termination asynchrony. Maximal masking occurred for target arcs as long as 5.0 deg of visual angle, exceeding previously reported distances. Misaligned or differently shaped stimuli produced less masking, suggesting that figural factors play a role in long-range backward masking.     

Spatial and temporal factors in masking by edges and disks

Increment threshold of a small test probe is found to be elevated by backgrounds of a disk, bar, or luminance step. The spatial parameters that produce maximum masking are found to be essentially similar with the three types of background. The lime course of masking is also found to be similar for the disk and bar background. It is suggested that a fundamentally similar type of visual processing underlies each of the masking situations.     

Spatial frequency masking in positive- and negative-symptom schizophrenia

The role of transient and sustained channels in masking was investigated in groups with positive and negative symptoms in schizophrenia and in a control group. The target stimulus was a 3.0 c/deg sinusoidal grating, which was masked at 11 stimulus-onset asynchronies between -40 to 360 ms by a 1.0 c/deg mask or an 11.0 c/deg mask. The results showed that there was no difference between the control and positive-symptom groups in the perception of the 3 c/deg target stimulus, nor was there a difference when the target was masked by 1 or 11 c/deg masking stimuli. In comparison with the control and positive-symptom groups, the negative-symptom group showed a significantly higher threshold for the perception of the 3 c/deg target stimulus and more masking with a 1 c/deg mask, but not with an 11 c/deg mask. The results provide evidence for distinguishable differences in visual masking between groups with positive and negative symptoms in schizophrenia.     

Impact of face masks on perceptions of black and white targets during the COVID-19 pandemic

Although the use of face masks was widespread during the COVID-19 pandemic, their impact on social perceptions is unclear. Notably, research that has investigated the influence of masks on personality attributions has focused on a small set of characteristics with a focus on predominantly White targets, and only few studies examining more diverse groups. Because the race of targets has been found to impact impression formation processes in significant ways, it is important to examine diverse racial targets along with a wider range of personality traits. The goal of the present research therefore was to explore how face masks impact a variety of trait attributions for both White and Black targets. Our results indicate that masking faces has positive implications (i.e., more trustworthy, warm, competent, and less threatening) for White but not Black targets. Notably, both White and Black targets with masks compared to without masks were perceived as more attractive, but the effect was smaller for Black targets. Because COVID-19 continues to be a public health emergency of international concern, with infections and deaths occurring around the world and with mask mandates still being implemented in a variety of contexts, knowing how people differentially respond to targets of different races wearing masks remains relevant and important.     

Sex differences in spatial ability reflected in performance on IQ subtests by black or white examinees

Sex differences in spatial ability were investigated using scores on the performance subtests of the Wechsler Intelligence Scale for Children. The sample consisted of 832 adolescents, evenly divided by race (black or white) and sex. Within both racial groups, males outscored females on all of the spatially-oriented subtests, but females outscored males on a subtest emphasizing rote memory. The similarity of patterning of sex differences within each racial group might be interpreted as indicating that something more than social experience alone is involved in this phenomenon.     

"白黑之争"及其对"缘起性空"说的误解

"白黑之争"是南朝刘宋时代儒家与佛教在哲学领域中的一次重要争论,其代表作是慧琳的<白黑论>.从有关争论来看,无论是反对佛教因果报应说的一方还是支持佛教的一方,对于佛教般若学中的"有谛"和"无谛"的本意都未能透彻地了解,这说明了印度大乘空宗哲学这种异质文化因子在当时还处在"格义"的阶段,多有误解.虽然在东晋十六国时代的僧肇已经比较准确地把握和阐释了般若"空"的本义,但佛教般若学那种"非有非无,非非有非非无"的思辩逻辑对于中土来说毕竟是陌生的,也是难以接受的.     

Some factors in condom use amongst first-year Nigerian University students and black and white South Africans

A questionnaire was administered to 213 sexually active first-year Nigerian university students and 150 Black and 150 White South African adults. Nigerian students gave 90% correct answers on 6 of the 10 items of a measure of condom knowledge (M = 6.1). The most common mistakes with respect to condom use were ignorance about putting a condom on just before ejaculation (37%), the use of an oil-based lubricant with a condom (29%), and when to take off a condom (28%). For the South African sample utility of the Health Belief Model and Theory of Reasoned Action for HIV prevention could be confirmed by intention to use condoms. Race and preventive benefits were predictive for current condom use. Findings have relevant implications for developing culturally diverse HIV intervention programs if confirmed with larger diverse groups.     

Perceptual masking: Peripheral vs central factors

Perceptual masking was studied under binocular and dichoptic conditions in order to separate peripheral and central interference effects. Under binocular conditions, when the test flash (TF) and the blanking flash (BF) fell on both retinas, both retroactive and proactive masking were demonstrated. Under dichoptic conditions, when the TF fell on one eye and the BF on the other eye, thus eliminating opportunity for intraretinal interference, there was partial retroactive perceptual masking and no proactive masking. These results suggest that binocular proactive masking is due to peripheral light adaptation, that binocular retroactive masking is due to both peripheral and central effects, and that dichoptic masking is due solely to central retrochiasmal interference. It is proposed that dichoptic retroactive perceptual masking affords a method of investigating central perception time, i.e., the time to consolidate a perceptual experience.     

DAPs of black and white juvenile incarcerates

Two groups of male juvenile incarcerates were separated on the basis of race, matched in terms of age, recidivism, and intelligence test scores, and given a human figure drawing task. Figures drawn were male and female. The drawings were scored on 14 emotional indicators. The results of the present study offer little consistent or conclusive support for the hypothesis that differences influenced by race can be found in the projective drawings of black and white subjects. The commonly held impressions that there are more incidences of neurotic or psychotic features in the projective tests of black subjects and that the projective drawings of black subjects are generally inferior to the projective drawings of white subjects were not supported by the present study.     

A Chicano/black/white encounter

What happens when members of three ethnic groups spend eighteen hours together in an “Encounter Weekend”? A facilitation style that placed the major responsibility for group progress on the group itself brought about marked behavioral changes among the group participants. The group progressed from distrust, suspicion, and violent rhetoric to effective communication and understanding. The interracial encounter is a powerful social tool that counselors can use to help people develop respect for each other and live together more humanely.     

Spatial effectiveness of the mask: Lateral inhibition in visual backward masking

Introducing a figure into a masking flash results in visual backward masking under conditions where a homogeneous masking flash does not suppress target detection. It is possible to analyze the spatial effects of such a masking figure in terms of lateral inhibition. It is hypothesized that incorporating a figure into the masking flash changes the inhibitory pattern the mask produces in the visual system. The interaction between the firing pattern produced by the mask and the residual inhibition from the preceding target presentation results in a phenomenal representation different from that produced by either the target or the mask alone.     

Spatial factors in metacontrast

Different mask ring widths, intercontour distances, mask durations, and interstimulus intervals were varied in a parametric manner. Results show decreasing amounts of metacontrast with increases in intercontour distance, and no significant effects of mask width or mask duration. The results provide support for monotonic metacontrast functions with maximum metacontrast at the offset of the target.