• Korean Journal of Cognitive Science
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• v.11 no.3_4
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• pp.13-22
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• 2000

The present study examined the role of spatial attention in implicit memory for words when the word identity processing was not required. Spatial attention to the identity-irrelevant perceptual features of the words was manipulated by using a visual search task (Experiment 1) or a focused attention task (Experiment 2). In two e experiments. a significant priming effect was not found for the target words as well as for the distractor words. Implicit memory for words was not affected by spatial attention on the perceptual properties of the words. indicating that the word identity processing is required to produce priming.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.61-70
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• 2015

This study, under the assumption that there may be a difference in colours recognized depending on background lightness and colour stimulus size, applied background lightness in a differential way and conducted an experiment by comparing the sizes of stimuli equivalent to $2^{\circ}$ and $10^{\circ}$. Based on the results, by reflecting the results of this experiment as a difference in colour recognition, which may occur when the input image is converted from a large-sized screen to a mobile-sized screen, power efficiency, one of the biggest issues, can be reflected in mobile devices and may contribute to effective three-dimensional image reproduction and image quality in 3-D or hologram as well as 2-D images.

• The Journal of the Korea Contents Association
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• v.16 no.5
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• pp.242-250
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• 2016

This study was conducted to investigate whether Stroop-related cognitive task will be affected according to the preceding affective valence factored by matchedness in response time(RT) and whether facial recognition will be indexed by specific event-related potentials(ERPs) signature in normal person as in patients suffering from affective disorder. ERPs primed by subliminal(30ms) facial stimuli were recorded when presented with four pairs of affect(positive or negative) and cognitive task(matched or mismatched) to get ERP effects(N2 and P300) in terms of its amplitude and peak latency variations. Behavioral response analysis based on RTs confirmed that subliminal affective stimuli primed the target processing in all affective condition except for the neutral stimulus. Additional results for the ERPs performed in the negative affect with mismatched condition reached significance of emotional-face specificity named N2 showing more amplitude and delayed peak latency compared to the positive counterpart. Furthermore the condition shows more positive amplitude and earlier peak latency of P300 effect denoting cognitive closure than the corresponding positive affect condition. These results are suggested to reflect that negative affect stimulus in subliminal level is automatically inhibited such that this effect had influence on accelerating detection of the affect and facilitating response allowing adequate reallocation of attentional resources. The functional and cognitive significance with these findings was implied in terms of subliminal effect and affect-related recognition modulating the cognitive tasks.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.11
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• pp.5005-5011
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• 2011

The purpose of this work is to know the validity of a new stimulation method in cognitive functional imaging using custom-designed images correspond to words or syllables improving the shortcomings of existing method using text. From March 2011 to May five Subjects in need of language related functional MRI scanning were selected and both of text stimulating method and image stimulating method sacanning were carried out three times each. Using 3.0T Philps MRI machine and Invivo Co's Eloquence system, data acquisition was performed with EPI-BOLD technique. Post processing was performed with SPM 99 while the activated signals were determined within 95 percent confidence level.The number of activation clusters and the activation ratio inside ROI were compared. As as result, all of the subject showed activation inside Broca area but it did not have statistical significance. In conclusion, the image sitimulation method has potential because image itself is a common means of recognition and it can be recognised easily even if there language barrier. This stimulation method can be applied to replacing the exising scanning method especially in the elderly, infants, foerigners who may not fully understand about the examination.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.8 no.1
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• pp.1-7
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• 2014

In this study, the effect of the automotive haptic-seat technology which can transmit the driving information by the vibro-stimulus from the seat was investigated to overcome previous system's limitation relied on the visual and audial method and to help handicap driving. A prototype haptic seat covers with 30 coin-type motors and driver module were developed for this sake. A driving simulator on the 6-DOF motion-base was used for driving situation and we executed the seat vibro-stimulus test with 10 young participants who have normal tactile sense. The haptic recognition ratio by 30 locations was measured and analyzed in the result. The intensity of vibro-stimulus was adjusted by input voltage of motors (1.5V,2.5V,3.5V). All vibro-stimulus locations at 2.5V and 3.5V could be recognized by all participants and even in the lowest recognition ratio of 1.5V. The results showed that the seat vibration stimulus could be useful to transfer the drivers' information while driving.

• Korean Journal of Cognitive Science
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• v.21 no.1
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• pp.177-197
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• 2010

Three experiments compared two hypotheses on visual selection; perceptual load hypothesis and dilution hypothesis. The perceptual load hypothesis predicts that perceptual load of task-relevant processing determines the level of task-irrelevant processing whereas the dilution hypothesis predicts that competition for limited-capacity attentional resource, not perceptual load, determines the locus of selection. To compare the two hypotheses, we investigated the influence of perceptual load in visual search on response interference by a distractor. Experiment 1 and 2 manipulated perceptual load by the set size of a search array and the colors of a target and non-targets, respectively. As a result, distractor interference decreased with a set size regardless of perceptual load. In order to further test the set size effect, Experiment 3 manipulated the perceptual categories of non-targets and a distractor. The results showed that distractor interference decreased only when non-targets belonged to the same category as a distractor. Overall, the current findings support the dilution hypothesis, but not the perceptual load hypothesis, and provide the evidence that visual selection is constrained by capacity-limited, category-specific attentional resources.

• Korean Journal of Cognitive Science
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• v.18 no.3
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• pp.285-303
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• 2007

Transient attention impairs observers' temporal resolution in a cued location. This detrimental effect of attention was ascribed to inhibitory connections from parvocellular to magnocellular neurons [1]. Alternatively, the difficulty might arise because attention facilitates the temporal summation of two successive stimuli. The current study examined this hypothesis by manipulating the luminance polarity of the stimuli against a background. Attention should not modulate temporal summation of two anti-polar stimuli because these are processed in separate channels. Indeed, observers judged the temporal order of two successive stimuli better in the cued location than in the uncued location when the stimuli were opposite in polarity, but temporal resolution was worse in the cued location when the stimuli had the same polarity. Thus, attentional effects on temporal resolution may be attributed to temporal summation rather than parvocellular inhibition of magnocellular activity.

• Korean Journal of Cognitive Science
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• v.20 no.2
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• pp.183-195
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• 2009

We made Korean IAPS through measuring Korean university students' emotional response(arousal and emotional valence) about the whole 956 IAPS pictures made by Lang et al.(2005). In addition, we examined the emotional difference between American and Korean by comparing the response of original American IAPS and those of Korean IAPS. The results showed that both response of arousal and emotional valence in Korean were highly correlated with those in American respectively. In details, two groups showed differences as well as similarities. Korean showed higher arousal response than American, but in both groups women showed higher arousal response than men. When examining the emotional valence of positive, neutral, and negative stimuli categorized by American IAPS, Korean showed more modest emotional valence than American, and this group difference was the same in both men and women. In particular, Korean women showed more negative emotional valence than Korean men, but American women showed more extreme emotional valence than American men. These results suggest that there are some cultural and sex differences in the emotional response, and that researchers have to consider them when studying with IAPS stimuli.

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2002.05a
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• pp.157-162
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• 2002

본 연구는 영어 단어 재인 과정에서 나타나는 한국인의 어휘 수준과 의미 수준 양상을 알아보기 위해 실시되었다 이를 위해 본 연구에서는 세 종류의 실험을 시행하였는데, 첫 번째 실험에서는 한국어 처리 기제와 영어 처리 기제의 독립 여부를 알아보기 위하여 한국어로는 여러 의미를 갖지만 영어로는 한 가지 의미만을 가지는 영어단어를 점화 자극으로 하고, 한국어와는 관련된 의미를 갖지만 영어와는 무관련한 한국어 단어를 목표 자극으로 사용하여(예, bridge-팔)언어간 의미 점화 어휘판단 과제를 시행하였다. 두 번째 실험에서는 비교적 개념 구조가 한국어와 영어에서 유사하다고 생각되어지는 외래어를 자극으로 사용하여 언어간(예, elevator-승강기), 언어 내(예, 엘리베이터-승강기) 어휘판단과제를 실시하였다. 연구 결과 첫 번째 실험에서는 유의미한 점화효과가 나타나지 않았고, 두 번째 실험에서는 언어간에는 SOA에 따라서 결과가 달랐고, 언어 내에는 촉진적 점화효과가 나타났다 이러한 결과는 영어의 일반 어휘에 대한 의미 표상 체계는 독립적으로 존재하였고, 외래어와 같이 특수한 어휘에 대해서는 다른 표상 체계를 갖고 있는 것으로 나타났다

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2010.05a
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• pp.31-36
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• 2010

우리글 읽기에서 중심와주위에 위치한 단어의 음운정보가 중심와주위 미리보기이득에 영향이 있음을 2음절의 표적단어를 사용하여 확인한 앞선 연구에 이어서, 본 연구에서는 중심와주위에 제시된 2음절 단어의 음운정보 중 첫째 음절의 음운정보 역할에 대해 알아보았다. 이를 위해 표적단어(예: '손목')에 대한 미리보기 자극으로 첫음절_동일비단어(예: '손욘'), 첫음절_음운유사비단어(예: '솜욘'), 첫음절_표기유사비단어(예: '��욘'), 첫음절_무관비단어(예: '�F�E')가 제시되었고 경계선기법을 사용하여 눈이 도약하는 동안에 미리보기 자극들은 표적자극으로 바뀌도록 하였다. 표적단어의 주시시간을 측정한 결과, 첫음절_음운유사비단어가 중심와주위에 먼저 제시되었을 때가 첫음절_표기유사비단어나 첫음절_무관비단어가 제시되었을 때보다 짧았다. 이러한 결과는 중심와주위 단어 첫 음절의 음운정보만으로도 고정 간 정보통합에 영향을 주어 중심와주위 미리보기이득에 기여한 것으로 해석되었다.