• Science of Emotion and Sensibility
• /
• v.13 no.3
• /
• pp.475-484
• /
• 2010

This study examined the influence of the SOA(stimulus onset asynchrony) between visual and auditory stimuli on the integration phenomenon of audio-visual senses. Within the stimulus integration phenomenon, the redundant target effect (the faster and more accurate response to the target stimulus when the target stimulus is presented with more than two modalities) and the visual dominance effect (the faster and more accurate response to a visual stimulus compared to an auditory stimulus) were examined as we composed a visual and auditory unimodal target condition and a multimodal target condition and then observed the response time and accuracy. Consequently, despite the change between visual and auditory stimuli SOA, there was no redundant target effect present. The auditory dominance effect appeared when the SOA between the two stimuli was over 100ms. Theses results imply that the redundant target effect is continuously maintained even when the SOA between two modal stimuli is altered, and also suggests that the behavioral results of superior information processing can only be deducted when the time difference between the onset of the auditory stimuli and the visual stimuli is approximately over 100ms.

• Korean Journal of Child Studies
• /
• v.38 no.3
• /
• pp.75-90
• /
• 2017

Objective: This study aimed to identify children's cognitive processing and performance characteristics while multiple task performance. It confirmed whether their multiple task performance and psychological refractory period (PRP) varied by task condition (stimulus onset asynchrony [SOA] and task difficulty) and stimulus modality. Methods: Seventy 5-year-olds were recruited. Multi-task tools were developed using the E-prime software. The children were required to respond to two stimuli (visual or auditory) presented with microscopic time difference and their response times (RTs) were recorded. Results: As the SOA increased, the RTs in the first task increased, while the RTs in the second task and PRP decreased. The RTs of the first and second tasks, and the PRP for difficult tasks, were significantly longer than those for easy tasks were. Additionally, there was an interaction effect between the SOA and task difficulty. Although there was no main effect of stimulus modality, task difficulty moderated the modality effect. In the high difficulty condition, the RTs of the first and second tasks and PRP for the visual-visual task were significantly longer than those for auditory-auditory task were. Conclusion: These results inform theoretical discussions on children's multi-task mechanism, and the loss of multiple task performance. Additionally, they provide practical implications and information on the composition of multi-tasks suitable for children in educational environments.

• Proceedings of the Korean Society for Cognitive Science Conference
• /
• 2002.05a
• /
• pp.105-110
• /
• 2002

The syllable and the morpheme are known to be important linguistic variables. This study examined whether these variables were activated in an early stage of word recognition using the fast priming task. Mixing the lettercase for the prime, the results of experiment 1 and 2 revealed effects of the syllable and the morpheme at a short SOA (Stimulus Onset Asynchrony), but not at a long SOA. Using the same manipulation in the experiment 3 and 4, an effect of syllable was found to be significant at the short SOA, but not at the long SOA. The study showed that the syllable plays a role in an early stage of word recognition.

• Proceedings of the KSPS conference
• /
• 2002.11a
• /
• pp.165-168
• /
• 2002

This research was conducted to investigate the priming effect in Korean and English word production by Korean speakers. Picture-naming with distractors was used as experimental task. The type of target language, the type of distractor language and SOA(Stimulus Onset Asynchrony) were used as variables. Cross-linguistic priming effect and within-linguistic priming effect were mesured to investigate bilinguals' conceptual system.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
• /
• 2001.05a
• /
• pp.293-297
• /
• 2001

본 연구는 공간상에서 초점 주의의 공간 위치가 인간의 감각 운동 협응에 의한 회귀억제에 미치는 영향을 정량적으로 분석하기 위하여 수행되었다. 본 실험은 20∼25세 나이의 성인 남·여를 대상으로 하였고, 자체 제작한 방음 암실에서 실시되었다. 지금까지의 회귀억제는 위치와 시간에 관련된 특이한 현상이라고 정의되어 왔다. 그러나 본 실험에서는 피험자의 주의가 집중되어 있는 공간에서는 시간에 관계없이 일어나지 않지만 피험자의 주의가 분산되었을 경우는 한 번 집중된 공간으로 주의를 옮기기가 어려운 회귀억제 현상이 일어났다. 본 연구에서는 회귀억제는 조건에 따라서는 자극 제시 간격(SOA)과 무관하며 초짐 주의 공간 위치와 관련된 현상임을 정량적으로 평가하였다.

• Korean Journal of Cognitive Science
• /
• v.12 no.1_2
• /
• pp.43-54
• /
• 2001

This study was conducted to explore the implicit structure of gender-stereotype which is one of the social categories. Social categories were considered to have the more evaluative properties and unclear hierarchical representations compared to the objects or the action categories. In this series of experiments. we want to examine the generalizability of the congruent effect into gender-stereotype using a priming paradigm and introducing the various SOA (stimulus onset asynchrony. SOA 250ms to 1000ms). The results of Experiment 1 and 3 (SOA 250-500ms) showed that the priming effects of female-female condition was larger than the other conditions. However. Experiment 2 (SOA 1000ms) showed that the priming effects among the conditions disappeared. We found the female-congruent effects only in a short SOA. These results suggest the possibility that the gender-stereotype in the automatic and implicit processing level can be represented b by the cross-categorical structure in some cultural area.

• Proceedings of the KSMRM Conference
• /
• 2001.11a
• /
• pp.106-106
• /
• 2001

목적： 일반인과 외상성 스트레스 장애환자들(PTSD)에서 동일한 공포 자극에 대한 기능적 뇌 자기ㆍ공명영상에서 뇌 활성화 부위의 차이를 알아보고자 하였다. 대상 및 방법： 대조군 (여자9명)과 외상성 스트레스 장애로(PTSD) 진단된 환자군 (여자9명)을 대상으로 하였고 모두 오른손잡이였다. 외상성 스트레스 장애군은 모두 교통사고와 관련되어 있었다. 1.5T MR 기기에서 EPI BOLD 기법을 이용하여 24개의 axial slice를 얻었으며, 시각자극으로 교통사고 현장 사진과 비교군으로 체크 무의 사진을 무작위로 배열하여 각각 1초씩 보여 주었다 (event related design). SOA (Stimulus Onset Asynchrony)는 3.5초로 하였고 전체 영상은 10분 동안 얻었다. 모든 환자에서 기능적 자기공명 영상은 1차례 시행하였다. 영상후 처리는 SPM 분석 프로그램을 사용하였으며 황성화 신호의 유의수준은 p=0.01을 기준으로 활성화 영상을 얻었다. 활성화 신호를 육안으로 비교 분석하였고 해마, 편도핵, 전전두엽의 활성화 정도를 중심으로 평가하였다.

• Science of Emotion and Sensibility
• /
• v.15 no.1
• /
• pp.37-46
• /
• 2012

We tested the effects of endogenous attention and reorienting on the performance of detection task. In the classic detection paradigm of Posner and Cohen (1980), performance on target detection is measured, where target appears either on the same or difference spatial location of cue stimulus after brief period of SOA (stimulus onset asynchrony). In this study, we induced exogenous attention by manipulating predictability of cue for target, and also induced reorientation by inserting additional (reorienting) cue between initial cue and target. Experiment 1 had three conditions of reorienting speed: Early, middle, and late. Facilitation and IOR (inhibition of return) occurred in different forms depending on SOA and reorienting speed, but we were not able to discover interpretable pattern in the results. However, reanalysis of early reorienting condition revealed that facilitation and IOR occurred in a crossed manner where short SOA found facilitation and long SOA did IOR, the typical results of simple detection task. Experiment 2 collected additional data to replicate the results in early reorienting condition of experiment 1. The results obtained that facilitation occurred with short SOA and IOR with long SOA. These results contrast with those of Wright and Richard (2000) where they reported elimination of IOR when cue had predictability of target locations. These results suggest that additional cue (here, orienting cue), which rapidly appears before extinction of IOR by prior cue, brings about double IOR. The present research demonstrates that even when attention is allocated to certain location via endogenous mechanism, rapidly repeating cues in certain location maximizes IOR that offsets the effects of endogenous attention to the same location.

• Korean Journal of Cognitive Science
• /
• v.21 no.4
• /
• pp.505-534
• /
• 2010

The purpose of this study was aimed to compare the lexical access and representation of semantic system in the bilinguals. The participants(late Korean-English bilinguals) performed the word-picture matching task. The task was to decide whether the pictures presented after the words(basic-level categories) represent the Korean(L1) or English(L2) words' meaning or not. The stimuli were consisted of common object belonged to four different categories(animal, part of body, clothes, tool). To control the translation strategies, the SOA(stimulus onset asynchrony) were manipulated as 650ms(Exp. 1) and 200ms(Exp. 2). In both experiment, the RTs were faster in L1 condition. The decision time of the part of body categories were shorter than the animal in L1 condition. In L2 condition, clothes were responded faster than the tools. The differences of the lexical access time implied that the bilingual semantic system seemed to be structured by more sub-level categories than the super-level, living or non-living things, and the ways to access the bilingual lexicon might be differentiated according to the languages.

• Korean Journal of Cognitive Science
• /
• v.22 no.4
• /
• pp.385-404
• /
• 2011

We examined how emotional background stimuli influence focused attention in a flanker task. An IAPS picture was presented for 1,000ms in advance, then a target and two flanker letters were presented against the IAPS picture for 200ms(Experiment 1). The flanking stimuli were simultaneously presented on the left and right sides of the target stimulus with distance of $0.5^{\circ}C$, $1^{\circ}C$, or $1.5^{\circ}C$ visual angle. We investigated the flanker compatibility effect that identification of target would be faster when they were flanked by identical(compatible) stimuli than when they were flanked by different(incompatible) stimuli. Results of Experiment 1 revealed that the flanker compatibility effect depended not only on the distance of flankers but also on the valence of a background IAPS pictures. Positive and neutral pictures showed distance effect that the flanker compatibility effect was decreased as the farther the distance was, while negative pictures showed no di stance effect. Positive and neutral pictures showed compatibility effects at all distance conditions, but negative pictures didn't showed compatibility effect at $1.5^{\circ}C$ distance condition. In Experiment 2, the SOA(Stimulus Onset Asynchrony) between the picture and the stimuli of flanker task was manipulated. The flanking stimuli were presented simultaneously on the left and right sides of the target stimulus with a distance of either $0.5^{\circ}C$ or $1.5^{\circ}C$ visual angle. The results of Experiment 2 showed that flanker compatibility effect depends on SOA. At long SOA(2800ms), negative pictures showed no distance effect, but positive or neutral pictures did. All valence conditions of background pictures showed compatibility effects at $0.5^{\circ}C$ distance condition, but didn't showed compatibility effect at $1.5^{\circ}C$ distance condition. At short SOA(100ms), all valence conditions of background pictures showed distance effect, and showed compatibility effects with the exception of negative background pictures at $1.5^{\circ}C$ distance condition. These findings suggest that the scope of visual attention becomes narrower when viewing negative emotional stimuli and becomes broadened when viewing positive emotional stimuli. The narrowed scope of attention in negative emotion lasts longer, while the broaden scope of attention in positive emotion lasts shorter.