The Cost of Spatial-Attentional Precuing for the Perception of Spatially Quantised Visual Images

Perception ◽  
1996 ◽  
Vol 25 (1_suppl) ◽  
pp. 4-4
Author(s):  
T Bachmann ◽  
N Kahusk
Keyword(s):  
Stimulus Onset ◽  
Visual Images ◽  
Facilitative Effect ◽  
Target Image ◽  
Spatial Filters ◽  
Facial Identity ◽  
Target Stimulus Onset Asynchrony ◽  
The Cost ◽  
Onset Asynchrony ◽  
Facial Images

We have investigated the effects of selective attentional spatial precuing and levels of quantisation on the perception of spatially quantised visual images of faces. The coarseness (number of square-shaped isoluminant pixels per image) of quantisation of eight alternative facial images was systematically varied from 9 to 16 pixels per image (along the horizontal dimension). 16 grey levels of the image were used; both local and global precues that designated the position of the expected stimulus-image were employed. Precue-to-target stimulus onset asynchrony was equal to 120 ms, and target image duration was varied between 28 and 76 ms. Targets were exposed at one of four quasiperipheral positions, either after the precue or without the precue. It was found that precues had a facilitative effect on identification with fine levels of quantisation or with original images, but this changed to a cost for precuing with coarse levels (9 – 11 pixels per image). A dramatic drop in overall identification efficiency with moving from 12 pixels per image to 11 pixels per image condition was also revealed. The results are interpreted as supporting (1) the idea of gradual coarse-to-detailed presetting of spatial filters by the precue, and (2) the existence of some implicit relational metrics of the critical facial identity cues that can be ‘catastrophically’ disintegrated by a small but critical change in quantisation value.

Semantic Processing of Foveally and Parafoveally Presented Words in a Lexical Decision Task

1992 ◽  
Vol 45 (2) ◽  
pp. 299-322 ◽  
Author(s):  
Luis J. Fuentes ◽  
Pío Tudela
Keyword(s):  
Visual Field ◽  
Lexical Decision ◽  
Lexical Decision Task ◽  
Semantic Processing ◽  
Stimulus Onset ◽  
Decision Task ◽  
Inhibitory Effects ◽  
Target Stimulus Onset Asynchrony ◽  
Onset Asynchrony ◽  
Prime Target

Using a lexical decision task in which two primes appeared simultaneously in the visual field for 150 msec followed by a target word, two experiments examined semantic priming from attended and unattended primes as a function of both the separation between the primes in the visual field and the prime-target stimulus-onset asynchrony (SOA). In the first experiment significant priming effects were found for both the attended and unattended prime words, though the effect was much greater for the attended words. In addition, and also for both attention conditions, priming showed a tendency to increase with increasing eccentricity (2.3°, 3.3°, and 4.3°) between the prime words in the visual field at the long (550 and 850 msec) but not at the short (250 msec) prime-target SOA. In the second experiment the prime stimuli were either two words (W-W) or one word and five Xs (W-X). We manipulated the degree of eccentricity (2° and 3.6°) between the prime stimuli and used a prime-target SOA of 850 msec. Again significant priming was found for both the attended and unattended words but only the W-W condition showed a decrement in priming as a function of the separation between the primes; this decrement came to produce negative priming for the unattended word at the narrow (2°) separation. These results are discussed in relation to the semantic processing of parafoveal words and the inhibitory effects of focused attention.

The Effects of Coarseness of Quantisation, Exposure Duration, and Selective Spatial Attention on the Perception of Spatially Quantised (‘Blocked’) Visual Images

Perception ◽  
1997 ◽  
Vol 26 (9) ◽  
pp. 1181-1196 ◽  
Author(s):  
Talis Bachmann ◽  
Neeme Kahusk
Keyword(s):  
Spatial Attention ◽  
Time Course ◽  
Spatial Scales ◽  
Stimulus Onset ◽  
Visual Images ◽  
Attentional Processing ◽  
Abrupt Decrease ◽  
A Minor ◽  
Onset Asynchrony ◽  
Coarse To Fine

The two objectives of the present article are (a) to present a brief overview of the effects of systematic variation of the spatial-scale value of quantisation and stimulus duration on the identification of original images that have been degraded by Harmon–Julesz type of image pixelisation by ‘blocking’ and (b) to report the results of two experiments where the effects of selective spatial precuing by local and global peripheral precues on the identification of quantised target stimuli have been studied. Both the overview and the new results reported here demonstrate some counterintuitive effects: (1) abrupt decrease in identification efficiency with only a minor change in the coarseness of quantisation over a critical value of pixels per stimulus; (2) a cost for valid attentional precuing with coarse-quantised images. If physical precues (exposed with stimulus onset asynchrony of 120 ms) were employed in order to orient spatial attention to perceive original or fine-quantised stimuli, then attentional facilitation was found. However, if the precued stimuli were coarse quantised then the facilitative effect crossed over to a detrimental effect of attention. These effects are discussed in the context of the microgenetic approach that presupposes the existence of a perceptual–attentional processing routine that operates according to the coarse-to-fine time-course rule of selective attentional activation of stimulus representations at various spatial scales.

EXPRESS: Controlled or automatic? Influence of congruency proportion and stimulus onset asynchrony on the brightness-valence and space-valence metaphoric congruency effects

2021 ◽  
pp. 174702182110481
Author(s):  
Yanli Huang ◽  
Chi-Shing Tse ◽  
Jiushu Xie ◽  
Manqiong Shen ◽  
Ruiming Wang
Keyword(s):  
Stimulus Onset Asynchrony ◽  
Congruency Effect ◽  
Stimulus Onset ◽  
Judgment Task ◽  
Conceptual Metaphor Theory ◽  
Primed Word ◽  
Metaphor Theory ◽  
Target Stimulus Onset Asynchrony ◽  
Onset Asynchrony ◽  
Prime Target

Whether a cognitive process is operated automatically or in a controlled manner has been a long-standing question in cognitive psychology. However, this issue has not been investigated in the activation of metaphoric association. A primed word valence judgment task is often used to test the activation of metaphoric association, in which participants first see a prime (bright/dark square or fixation point moving up or down from the center of the screen) and then make a valence judgment to a target word. Metaphoric congruency effect occurs when participants make faster judgments to the target with valence being matched with the prime (good followed bright/top prime) than being mismatched with the prime (good followed dark/bottom prime). In the present two experiments, we manipulated prime-target stimulus onset asynchrony (SOA) and proportion of metaphorically congruent trials (congruency proportion) to tease apart the effects of automatic and controlled activation of brightness-valence and spatial-valence metaphoric associations on word valence judgments. Results showed an overall effect of congruency proportion on brightness-valence and spatial-valence metaphoric congruency effect, which was independent of prime-target SOA. The effect was enhanced or reversed when congruency proportion was higher or lower than 0.5, respectively, suggesting that the activation of metaphoric association could be modulated by strategic control. The implications of these findings on the Conceptual Metaphor Theory and semantic priming theories are discussed.

Attention Effects on Form Discrimination at Different Eccentricities

1989 ◽  
Vol 41 (4) ◽  
pp. 719-746 ◽  
Author(s):  
MaryLou Cheal ◽  
Don Lyon
Keyword(s):  
Time Course ◽  
Target Location ◽  
Short Soas ◽  
Stimulus Onset ◽  
Attention Shifting ◽  
Form Discrimination ◽  
Discrimination Accuracy ◽  
Target Stimulus Onset Asynchrony ◽  
Time Course Of Attention ◽  
Onset Asynchrony

Considerable disagreement exists in the visual attention literature about how attention is allocated over the visual field. One frequently expressed metaphor is that attention moves like a spotlight, and in some variants it is assumed that attention takes longer to shift to targets further from fixation. In order to test this metaphor, five experiments were conducted in which target location was precued and form discrimination accuracy was assessed. By varying the interval between the precue and the target (stimulus onset asynchrony, SOA), a time course of attention effects was obtained for targets at 2°, 6°, and 10° eccentricity. In the first three experiments, precueing effects were found, but there were no differences in performance as a function of eccentricity for very short SOAs, with either a peripheral cue or a foveal arrow cue. For long SOAs, however, performance was better for targets that were closer to fixation. In Experiments 4 (peripheral cue) and 5 (foveal cue), the targets were scaled to make them equally discriminable at all eccentricities. Again precueing effects were found, but there were no differences in accuracy as a function of eccentricity for most SOAs. These results suggest that attention shifting is not analogous to a constant-velocity moving spotlight.

scholarly journals EXPRESS: Comparing Person and People Perception: Multiple Group Members Do Not Increase Stereotype Priming

2021 ◽  
pp. 174702182110128
Author(s):  
Linn Maria Persson ◽  
Marius Golubickis ◽  
Dagmara Dublas ◽  
Neza Mastnak ◽  
Johanna Falben ◽  
...  
Keyword(s):  
Social Cognitive ◽  
Stimulus Onset ◽  
Stereotype Activation ◽  
Multiple Group ◽  
Priming Task ◽  
Target Stimulus Onset Asynchrony ◽  
Group Members ◽  
Onset Asynchrony ◽  
Stereotype Priming ◽  
Prime Target

A characteristic feature of daily life is encountering people in groups. Surprisingly, however, at least during the initial stages of processing, research has focused almost exclusively on the construal of single individuals. As such, it remains unclear whether person and people (i.e., group) perception yield comparable or divergent outcomes. Addressing this issue, here we explored a core social-cognitive topic — stereotype activation — by presenting both single and multiple facial primes in a sequential-priming task. In addition, the processes underlying task performance were probed using a drift diffusion model analysis. Based on prior work, it was hypothesized that multiple (vs. single) primes would increase stereotype-based responding. Across two experiments, a consistent pattern of results emerged. First, stereotype priming was insensitive to the number of primes that were presented and occurred only at a short prime-target stimulus onset asynchrony (i.e., 250 ms). Second, priming was underpinned by a bias toward congruent (vs. incongruent) prime-target responses. Collectively these findings advance understanding of the emergence and origin of stereotype priming during person and people perception.

Contour Extraction of Cerebrovascular Based on Maximum Optimization Cost

2011 ◽  
Vol 204-210 ◽  
pp. 1415-1418
Author(s):  
De Jiang Zhang ◽  
Na Na Dong ◽  
Xiao Mei Lin
Keyword(s):  
Dynamic Programming ◽  
Blood Vessel ◽  
High Efficiency ◽  
High Accuracy ◽  
Differential Method ◽  
Cost Curve ◽  
Contour Extraction ◽  
Target Image ◽  
The Cost ◽  
Conventional Algorithm

By studying the conventional algorithm of contour extraction, a new method of contour extraction in blood vessel of brain is proposed based on the MOC maximum optimization cost. First of all, the theory computes the gray differential of the image by conventional differential method to build the cost space. Then, by using dynamic programming theory, the maximum optimization cost curve in the space is extracted to serve as the specific cerebrovascular profile. The experiments show that this method ensures high efficiency in extracting cerebrovascular contour and a high accuracy in positioning cerebrovascular contour, and it diminishes the target image ambiguity caused by noise to improve the anti-interference ability of Contour extraction.

Analisis Algoritma Shi-Tomasi Dalam Pengujian Citra Senyum Pada Wajah Manusia

2021 ◽  
Vol 5 (6) ◽  
pp. 1036-1043
Author(s):  
Ardi wijaya ◽  
Puji Rahayu ◽  
Rozali Toyib
Keyword(s):  
Image Processing ◽  
Corner Point ◽  
Confusion Matrix ◽  
Target Image ◽  
Edge Points ◽  
Ballistic Test ◽  
Image Processing Algorithms ◽  
Processing Algorithms ◽  
Facial Images ◽  
Angle Calculation

Problems in image processing to obtain the best smile are strongly influenced by the quality, background, position, and lighting, so it is very necessary to have an analysis by utilizing existing image processing algorithms to get a system that can make the best smile selection, then the Shi-Tomasi Algorithm is used. the algorithm that is commonly used to detect the corners of the smile region in facial images. The Shi-Tomasi angle calculation processes the image effectively from a target image in the edge detection ballistic test, then a corner point check is carried out on the estimation of translational parameters with a recreation test on the translational component to identify the cause of damage to the image, it is necessary to find the edge points to identify objects with remove noise in the image. The results of the test with the shi-Tomasi algorithm were used to detect a good smile from 20 samples of human facial images with each sample having 5 different smile images, with test data totaling 100 smile images, the success of the Shi-Tomasi Algorithm in detecting a good smile reached an accuracy value of 95% using the Confusion Matrix, Precision, Recall and Accuracy Methods.

Anchor Effects and Figural Aftereffects: A Comparative Psychophysical Investigation

1975 ◽  
Vol 41 (3) ◽  
pp. 791-796 ◽  
Author(s):  
Johannes Abresch ◽  
Viktor Sarris
Keyword(s):  
Stimulus Onset Asynchrony ◽  
Contrast Effect ◽  
Rating Scale ◽  
Stimulus Onset ◽  
Figural Aftereffect ◽  
Anchor Effect ◽  
Substantial Influence ◽  
Perceptual Contrast ◽  
Points Of View ◽  
Onset Asynchrony

Perceptual contrast effect was studied from two points of view, as a special anchor effect and as a special figural aftereffect. Two experiments were conducted to investigate the influence of stimulus onset asynchrony on contrast and assimilation effects, induced and measured by different psychophysical methods. Stimuli were circular beams of light projected on screens (Delboef type of illusion). When anchor and series stimuli were shown and the latter were judged by means of a rating scale, stimulus onset asychrony had no substantial influence on the contrast effect (Exp. I). When the constant method was applied, however, the asynchrony altered the shape of the contrast effect considerably (Exp. II).

Primed-lexical decision: The effect of varying the stimulus-onset asynchrony of prime and target

1986 ◽  
Vol 61 (1) ◽  
pp. 17-36 ◽  
Author(s):  
Annette M.B. de Groot ◽  
Arnold J.W.M. Thomassen ◽  
Patrick T.W. Hudson
Keyword(s):  
Lexical Decision ◽  
Stimulus Onset Asynchrony ◽  
Stimulus Onset ◽  
Onset Asynchrony

Sequential Stereotype Priming: A Meta-Analysis

2017 ◽  
Vol 22 (3) ◽  
pp. 199-227 ◽  
Author(s):  
Ciara K. Kidder ◽  
Katherine R. White ◽  
Michelle R. Hinojos ◽  
Mayra Sandoval ◽  
Stephen L. Crites
Keyword(s):  
Meta Analysis ◽  
Stimulus Onset ◽  
Future Research ◽  
Implicit Measures ◽  
Methodological Rigor ◽  
Priming Paradigm ◽  
Type Data ◽  
Onset Asynchrony ◽  
Stereotype Priming ◽  
Explicit Measures

Psychological interest in stereotype measurement has spanned nearly a century, with researchers adopting implicit measures in the 1980s to complement explicit measures. One of the most frequently used implicit measures of stereotypes is the sequential priming paradigm. The current meta-analysis examines stereotype priming, focusing specifically on this paradigm. To contribute to ongoing discussions regarding methodological rigor in social psychology, one primary goal was to identify methodological moderators of the stereotype priming effect—whether priming is due to a relation between the prime and target stimuli, the prime and target response, participant task, stereotype dimension, stimulus onset asynchrony (SOA), and stimuli type. Data from 39 studies yielded 87 individual effect sizes from 5,497 participants. Analyses revealed that stereotype priming is significantly moderated by the presence of prime–response relations, participant task, stereotype dimension, target stimulus type, SOA, and prime repetition. These results carry both practical and theoretical implications for future research on stereotype priming.

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