Attentional bias in anxiety: selective search or defective filtering?

Two experimental tasks were used to investigate the nature of a previously documented bias in attention associated with anxiety. Results from the first task failed to reveal any differences between anxious and nonanxious subjects, either in attention focusing or selective search for letters. The second task, with words as targets and distractors, suggested that selective search was less efficient in anxious subjects when distractors were present. Currently anxious subjects were slower than controls when required to search for the target among distractors of any type, whereas both currently anxious and recovered subjects were slower when the distractors were threatening words. It was therefore suggested that a bias favoring threat cues during perceptual search is an enduring feature of individuals vulnerable to anxiety, rather than a transient consequence of current mood state alone.     

Visual persistence of spatially filtered images

Periodic stimuli such as sine-wave gratings and checkerboard patterns have been used in many studies of visual perception. It is well known that with such stimuli, visual persistence increases as spatial frequency increases and as contrast decreases. It is not clear, however, that similar relationships obtain for aperiodic stimuli such as natural images. Digitized images of objects (a face and a vase) were submitted to two-dimensional Fourier analysis. Four pairs of spatial frequency band-limited images were created for each image. Each pair consisted of a normal (NP) and a scrambled (SP) phase version, with the magnitude spectrum and space-averaged luminance the same within each pair. Filter bandwidths were one octave wide. Threshold persistence was measured for each spatially filtered image. Visual persistence for SP images increased significantly as spatial frequency increased, whereas no significant differences were found for NP images. This suggests that the temporal processing of complex, aperiodic visual images is influenced by the spatial frequency and contrast of local features within the image and cannot be predicted by space-averaged estimates of contrast and spatial frequency.     

The effects of spatial phase on reaction time to spatially filtered images

Summary Many studies of visual perception have used periodic stimuli such as sine-wave gratings and checker-board patterns. It is well known that reaction time (RT) to such stimuli increases with increasing spatial frequency and decreasing contrast. While this is the case with periodic stimuli it is not clear that these relationships obtain for aperiodic stimuli such as natural scenes. A digitized image of an object (a vase) was submitted to two-dimensional Fourier analysis. Four pairs of spatial frequency band-limited images were created for each image. Each pair consisted of a normal-phase (NP) and a scrambled-phase (SP) version, with the magnitude spectrum and space-averaged luminance the same within each pair. Filter band-widths were 1 octave wide. Manual RT was measured for onset and offset of each spatially filtered image. Mean RT for SP images increased significantly with increasing spatial frequency, while no other significant differences were found with the NP images. This suggests that the temporal processing of complex, aperiodic images is influenced by the spatial frequency and contrast of local regions within the image, rather than by the space-averaged contrast of the entire image, and cannot be predicted by global estimates of contrast and spatial frequency.     

The impact of computers on cognitive psychology

Computer developments and their applications in cognitive psychology are reviewed. Examples from recent studies illustrate the ways that computers are used for different research purposes: stimulus generation, on-line interactive experimental control, response collection, data analysis, and theory building. A quantitative analysis of federal funding for computer-based and noncomputer research compares costs over the past 9 years for the areas of perception, memory, learning, and thinking. A tabulation of journal articles relevant to computer-based cognitive research shows the distribution of articles over various categories of hardware and software development. Finally, the advantages and disadvantages of using computers in cognitive research are evaluated.     

The effects of spatial frequency and temporal waveform on three measures of temporal processing

The effects of spatial frequency and temporal transition of sine-wave grating onset and offset were assessed using measures of reaction time, visual persistence, and temporal order judgements. The stimuli were lateralized fields, separated by 1 degree of visual angle. Slow temporal transition resulted in significantly poorer performance than did abrupt onset and offset, but spatial frequency had a minimal effect. Thus, the latency, temporal resolution, and temporal ordering of events are mediated by a mechanism that is sensitive to abrupt temporal transients. The stimulus conditions employed did not result in a shift in the point of subjective simultaneity.     

CONCEPTS OF INTELLIGENCE: A COMPARISON OF CHINESE GRADUATES FROM CHINESE AND ENGLISH SCHOOLS IN HONG KONG*

The present study investigated the concepts of intelligence of two groups of Hong Kong Chinese university students. They differed in the secondary schools from which they graduated, one followed the Chinese system and the other the English system. These two groups were otherwise similar in age, academic achievement, and racial background. Subjects were asked to rate items selected from four popular intelligence tests in terms of their relevance to measuring intelligence and perceived difficulty. The relevance ratings were taken as reflections of the group's concept of intelligence. Factor analysis revealed two major factors and several minor factors underlying the relevance ratings of the two groups. The major ones were Non-verbal and Verbal reasoning skills, and the minor ones were Social, Numerical, and Retrieval skills. The Non-verbal reasoning skill was rated equally relevant by the two groups of subjects and was considered as the most relevant skill to measuring intelligence. The Verbal reasoning and Social skills were next, followed by the Numerical skill with the Retrieval skill being the least relevant. The Chinese-school group tended to rate the Verbal reasoning skill to be less relevant than did the English-school group. These findings were attributed to the mental effort involved in solving each type of task and to the differences in school instruction.     

Effects of musically evoked affect on women's interpersonal attraction toward and perceptual judgments of physical attractiveness of men

In a between-subjects design, female subjects evaluated photographs of attractive and unattractive stimulus males while listening to positive affect-evoking rock music, negative affect-evoking avant-garde music, or no music at all. Consistent with previous research, subjects evaluated attractive stimulus males more positively than unattractive males on a variety of interpersonal judgment dimensions. Furthermore, subjects responded with more positive evaluations of personal character of, and attraction toward, stimulus persons in the rock music as compared to the avant-garde music condition. Finally, assessments of physical attractiveness were influenced by the music conditions, with stimulus persons judged of greater physical attractiveness in the rock as compared with the avant-garde music condition. The results are discussed in terms of extending the Byrne-Clore reinforcement-affect model of interpersonal attraction.