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Article ; Online: Cue integration as a common mechanism for action and outcome bindings.

Yamamoto, Kentaro

2020 Volume 205, Page(s) 104423

Abstract: When a voluntary action is followed by a sensory outcome, their timings are perceived to shift toward each other compared to when they were generated independently. Recent studies have tried to explain this temporal binding effect based on the cue ... ...

Abstract	When a voluntary action is followed by a sensory outcome, their timings are perceived to shift toward each other compared to when they were generated independently. Recent studies have tried to explain this temporal binding effect based on the cue integration theory, in which the timing of action and outcome are estimated as a precision-weighted average of their individual estimates, although distinct results were obtained between the binding of action and outcome. This study demonstrates that cue integration underlies both action and outcome bindings, using visual changes as action outcomes. Participants viewed a moving clock presented on a screen to report the onset time of their action or the feature changes of visual objects that were relevant or irrelevant to the clock movement. The results revealed that the precision of outcome timing judgment was different based on the object that underwent a feature change. Moreover, consistent with the theory's prediction, the perceptual shifts of action and outcome timings were larger and smaller, respectively, when the precision of outcome timing judgments was higher. These results suggest that cue integration serves as a common mechanism in action and outcome bindings.
MeSH term(s)	Cues ; Humans ; Judgment ; Movement ; Photic Stimulation
Language	English
Publishing date	2020-08-22
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1499940-7
ISSN	1873-7838 ; 0010-0277
ISSN (online)	1873-7838
ISSN	0010-0277
DOI	10.1016/j.cognition.2020.104423
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Article ; Online: Face adaptation induces duration distortion of subsequent face stimuli in a face category-specific manner.

Sarodo, Akira / Yamamoto, Kentaro / Watanabe, Katsumi

Journal of vision

2024 Volume 24, Issue 2, Page(s) 7

Abstract: Studies have shown that duration perception depends on several visual processes. However, the stages of visual processes that contribute to duration perception remain unclear. This study examined the effects of categorical differences in face adaptation ... ...

Abstract	Studies have shown that duration perception depends on several visual processes. However, the stages of visual processes that contribute to duration perception remain unclear. This study examined the effects of categorical differences in face adaptation on perceived duration. In all the experiments, we compared the perceived durations of human, monkey, and cat faces (comparison stimuli) after adapting to a human face. Results revealed that the human comparison stimuli were perceived shorter than the monkey and cat comparison stimuli (categorical face adaptation on duration perception [CFAD]). The difference between the face categories disappeared when the adapting stimulus was rendered unrecognizable by phase scrambling, indicating that adaptation to low-level visual properties cannot fully account for the CFAD effect. Furthermore, CFAD was preserved but attenuated when the adapting stimulus was inverted or a 1,000-ms interval was inserted before the comparison stimuli, which implied that CFAD occurred as long as the adapting stimulus was perceived as a face and not simply based on conceptual category processes. These findings indicate that face adaptation affects perceived duration in a category-specific manner (the CFAD effect) and highlights the involvement of visual categorical processes in duration perception.
MeSH term(s)	Humans ; Animals ; Facial Recognition ; Haplorhini
Language	English
Publishing date	2024-02-22
Publishing country	United States
Document type	Journal Article
ZDB-ID	2106064-2
ISSN	1534-7362 ; 1534-7362
ISSN (online)	1534-7362
ISSN	1534-7362
DOI	10.1167/jov.24.2.7
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Article ; Online: The role of perceptual processing in the oddball effect revealed by the Thatcher illusion.

Sarodo, Akira / Yamamoto, Kentaro / Watanabe, Katsumi

Vision research

2024 Volume 220, Page(s) 108399

Abstract: When a novel stimulus (oddball) appears after repeated presentation of an identical stimulus, the oddball is perceived to last longer than the repeated stimuli, a phenomenon known as the oddball effect. We investigated whether the perceptual or physical ... ...

Abstract	When a novel stimulus (oddball) appears after repeated presentation of an identical stimulus, the oddball is perceived to last longer than the repeated stimuli, a phenomenon known as the oddball effect. We investigated whether the perceptual or physical differences between the repeated and oddball stimuli are more important for the oddball effect. To manipulate the perceptual difference while keeping their physical visual features constant, we used the Thatcher illusion, in which an inversion of a face hinders recognition of distortion in its facial features. We found that the Thatcherized face presented after repeated presentation of an intact face induced a stronger oddball effect when the faces were upright than when they were inverted (Experiment 1). However, the difference in the oddball effect between face orientations was not observed when the intact face was presented as the oddball after repeated presentation of a Thatcherized face (Experiment 2). These results were replicated when participants performed both the intact-repeated and Thatcherized-repeated conditions in a single experiment (Experiment 3). Two control experiments confirmed that the repeated presentation of the preceding stimuli is necessary for the difference in duration distortion to occur (Experiments 4 and 5). The results suggest the considerable role of perceptual processing in the oddball effect. We discuss the discrepancy in the results between the intact-repeated and Thatcherized-repeated conditions in terms of predictive coding.
MeSH term(s)	Humans ; Female ; Male ; Young Adult ; Adult ; Photic Stimulation/methods ; Facial Recognition/physiology ; Illusions/physiology ; Analysis of Variance ; Pattern Recognition, Visual/physiology ; Visual Perception/physiology
Language	English
Publishing date	2024-04-10
Publishing country	England
Document type	Journal Article
ZDB-ID	200427-6
ISSN	1878-5646 ; 0042-6989
ISSN (online)	1878-5646
ISSN	0042-6989
DOI	10.1016/j.visres.2024.108399
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Article ; Online: How many categories are there in crossmodal correspondences? A study based on exploratory factor analysis.

Ohtake, Yuka / Tanaka, Kanji / Yamamoto, Kentaro

PloS one

2023 Volume 18, Issue 11, Page(s) e0294141

Abstract: Humans naturally associate stimulus features of one sensory modality with those of other modalities, such as associating bright light with high-pitched tones. This phenomenon is called crossmodal correspondence and is found between various stimulus ... ...

Abstract	Humans naturally associate stimulus features of one sensory modality with those of other modalities, such as associating bright light with high-pitched tones. This phenomenon is called crossmodal correspondence and is found between various stimulus features, and has been suggested to be categorized into several types. However, it is not yet clear whether there are differences in the underlying mechanism between the different kinds of correspondences. This study used exploratory factor analysis to address this question. Through an online experiment platform, we asked Japanese adult participants (Experiment 1: N = 178, Experiment 2: N = 160) to rate the degree of correspondence between two auditory and five visual features. The results of two experiments revealed that two factors underlie the subjective judgments of the audiovisual crossmodal correspondences: One factor was composed of correspondences whose auditory and visual features can be expressed in common Japanese terms, such as the loudness-size and pitch-vertical position correspondences, and another factor was composed of correspondences whose features have no linguistic similarities, such as pitch-brightness and pitch-shape correspondences. These results confirm that there are at least two types of crossmodal correspondences that are likely to differ in terms of language mediation.
MeSH term(s)	Adult ; Humans ; Visual Perception ; Caffeine ; Factor Analysis, Statistical ; Judgment ; Linguistics
Chemical Substances	Caffeine (3G6A5W338E)
Language	English
Publishing date	2023-11-14
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2267670-3
ISSN	1932-6203 ; 1932-6203
ISSN (online)	1932-6203
ISSN	1932-6203
DOI	10.1371/journal.pone.0294141
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Article ; Online: Catheter-associated Mycobacterium intracellulare biofilm infection in C3HeB/FeJ mice.

Yamamoto, Kentaro / Tsujimura, Yusuke / Ato, Manabu

Scientific reports

2023 Volume 13, Issue 1, Page(s) 17148

Abstract: Non-tuberculosis mycobacterial (NTM) diseases are steadily increasing in prevalence and mortality worldwide. Mycobacterium avium and M. intracellulare, the two major pathogens of NTM diseases, are resistant to antibiotics, and chlorine, necessitating ... ...

Abstract	Non-tuberculosis mycobacterial (NTM) diseases are steadily increasing in prevalence and mortality worldwide. Mycobacterium avium and M. intracellulare, the two major pathogens of NTM diseases, are resistant to antibiotics, and chlorine, necessitating their capacity to survive in natural environments (e.g. soil and rivers) and disinfected municipal water. They can also form biofilms on artificial surfaces to provide a protective barrier and habitat for bacilli, which can cause refractory systemic disseminated NTM disease. Therefore, preventing biofilm formation by these pathogens is crucial; however, not many in vivo experimental systems and studies on NTM biofilm infection are available. This study develops a mouse model of catheter-associated systemic disseminated disease caused by M. intracellulare that reproduces the pathophysiology of catheter-associated infections observed in patients undergoing peritoneal dialysis. In addition, the bioluminescence system enabled noninvasive visualization of the amount and distribution of bacilli in vivo and conveniently examine the efficacy of antimicrobials. Furthermore, the cellulose-based biofilms, which were extensively formed in the tissue surrounding the catheter insertion site, reduced drug therapy effectiveness. Overall, this study provides insights into the cause of the drug resistance of NTM and may guide the development of new therapies for NTM diseases.
MeSH term(s)	Humans ; Mice ; Animals ; Mycobacterium avium Complex ; Mycobacterium avium-intracellulare Infection/microbiology ; Mycobacterium Infections, Nontuberculous/microbiology ; Nontuberculous Mycobacteria ; Mice, Inbred Strains ; Catheters ; Biofilms ; Bacillus
Language	English
Publishing date	2023-10-10
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-44403-0
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Article ; Online: Suppression of Charge Recombination by Auxiliary Atoms in Photoinduced Charge Separation Dynamics with Mn Oxides: A Theoretical Study.

Ohnishi, Yu / Yamamoto, Kentaro / Takatsuka, Kazuo

Molecules (Basel, Switzerland)

2022 Volume 27, Issue 3

Abstract: Charge separation is one of the most crucial processes in photochemical dynamics of energy conversion, widely observed ranging from water splitting in photosystem II (PSII) of plants to photoinduced oxidation reduction processes. Several basic principles, ...

Abstract	Charge separation is one of the most crucial processes in photochemical dynamics of energy conversion, widely observed ranging from water splitting in photosystem II (PSII) of plants to photoinduced oxidation reduction processes. Several basic principles, with respect to charge separation, are known, each of which suffers inherent charge recombination channels that suppress the separation efficiency. We found a charge separation mechanism in the photoinduced excited-state proton transfer dynamics from Mn oxides to organic acceptors. This mechanism is referred to as coupled proton and electron wave-packet transfer (CPEWT), which is essentially a synchronous transfer of electron wave-packets and protons through mutually different spatial channels to separated destinations passing through nonadiabatic regions, such as conical intersections, and avoided crossings. CPEWT also applies to collision-induced ground-state water splitting dynamics catalyzed by Mn
Language	English
Publishing date	2022-01-24
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	1413402-0
ISSN	1420-3049 ; 1431-5165 ; 1420-3049
ISSN (online)	1420-3049
ISSN	1431-5165 ; 1420-3049
DOI	10.3390/molecules27030755
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Article ; Online: Changes in face category induce stronger duration distortion in the temporal oddball paradigm.

Sarodo, Akira / Yamamoto, Kentaro / Watanabe, Katsumi

Vision research

2022 Volume 200, Page(s) 108116

Abstract: A novel stimulus embedded in a sequence of repeated stimuli is often perceived to be longer in duration. Studies have indicated the involvement of repetition suppression in this duration distortion, but it remains unclear which processing stages are ... ...

Abstract	A novel stimulus embedded in a sequence of repeated stimuli is often perceived to be longer in duration. Studies have indicated the involvement of repetition suppression in this duration distortion, but it remains unclear which processing stages are important. The present study examined whether high-level visual category processing contributes to the oddball's duration distortion. In Experiment 1, we presented a novel face image in either human, monkey, or cat category after a repetition of an identical human face image in the temporal oddball paradigm. We found that the duration distortion of the last stimulus increased when the face changed across different categories, than when it changed within the same category. However, the effect of category change disappeared when globally scrambled and locally scrambled face images were used in Experiments 2 and 3, respectively, suggesting that the difference in duration distortion cannot be attributed to low-level visual properties of the images. Furthermore, in Experiment 4, we again used intact face images and found that category changes can influence the duration distortion even when a series of different human faces was presented before the last stimulus. These findings indicate that high-level visual category processing plays an important role in the duration distortion of oddballs. This study supports the idea that visual processing at higher visual stages is involved in duration perception. (219 words).
MeSH term(s)	Animals ; Facial Recognition ; Humans ; Visual Perception
Language	English
Publishing date	2022-09-09
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	200427-6
ISSN	1878-5646 ; 0042-6989
ISSN (online)	1878-5646
ISSN	0042-6989
DOI	10.1016/j.visres.2022.108116
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Zs.A 521: Show issues

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Je nach Verfügbarkeit (siehe Angabe bei Bestand)
bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
Jg. 1995 - 2021: Lesesall (1.OG)
ab Jg. 2022: Lesesaal (EG)

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Article ; Online: Binuclear Mn oxo complex as a self-contained photocatalyst in water-splitting cycle: Role of additional Mn oxides as a buffer of electrons and protons.

Yamamoto, Kentaro / Takatsuka, Kazuo

The Journal of chemical physics

2020 Volume 152, Issue 2, Page(s) 24115

Abstract: We theoretically propose a photoinduced water-splitting cycle catalyzed by a binuclear Mn oxo complex. In our "bottom-up approach" to this problem, we once proposed a working minimal model of water-splitting cycle in terms of a mononuclear Mn oxo complex ...

Abstract	We theoretically propose a photoinduced water-splitting cycle catalyzed by a binuclear Mn oxo complex. In our "bottom-up approach" to this problem, we once proposed a working minimal model of water-splitting cycle in terms of a mononuclear Mn oxo complex as a catalyst along with water clusters [K. Yamamoto and K. Takatsuka, Phys. Chem. Chem. Phys. 20, 6708 (2018)]. However, this catalyst is not self-contained in that the cycle additionally needs buffering molecules for electrons and protons in order to reload the Mn complex with electrons and protons, which are lost by photoinduced charge separation processes. We here show that a binuclear Mn oxo complex works as a self-contained photocatalyst without further assistant of additional reagents and propose another catalytic cycle in terms of this photocatalyst. Besides charge separation and proton relay transfer, the proposed cycle consists of other fundamental chemical dynamics including electron-proton reloading, radical relay-transfer, and Mn reduction. The feasibility of the present water-splitting cycle is examined by means of full dimensional nonadiabatic electron-wavepacket dynamics based on multireference electronic wavefunctions and energy profiles estimated with rather accurate quantum chemical methods for all the metastable states appearing in the cycle.
Language	English
Publishing date	2020-01-13
Publishing country	United States
Document type	Journal Article
ZDB-ID	3113-6
ISSN	1089-7690 ; 0021-9606
ISSN (online)	1089-7690
ISSN	0021-9606
DOI	10.1063/1.5139065
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Article ; Online: Charge separation and successive reconfigurations of electronic and protonic states in a water-splitting catalytic cycle with the Mn

Yamamoto, Kentaro / Takatsuka, Kazuo

Physical chemistry chemical physics : PCCP

2019 Volume 22, Issue 15, Page(s) 7912–7934

Abstract: Much insight into the basic mechanisms of photoexcited and collision-induced ground-state water splitting has been accumulated in our nonadiabatic electron wavepacket dynamics studies based on a building-block approach reaching up to systems of binuclear ...

Abstract	Much insight into the basic mechanisms of photoexcited and collision-induced ground-state water splitting has been accumulated in our nonadiabatic electron wavepacket dynamics studies based on a building-block approach reaching up to systems of binuclear Mn oxo complexes. We here extend the study to a ground-state water-splitting catalytic cycle with tetranuclear Mn oxo complex Mn4CaO5, or Mn3Ca(H2O)2(OH)4-OH-Mn(4)(H2O)2, where Mn3Ca(H2O)2(OH)4 is fixed to a skewed cubic structure by μ-hydroxo bridges and is tied to the terminal group Mn(4)(H2O)2. We show using the method of real-time nonadiabatic electron wavepacket dynamics that four charge separation steps always take place only through the terminal group Mn(4)(H2O)2 alone, thereby producing 4 electrons and 4 protons which are transported to the acceptors. Each of the three charge separation steps is followed by a reloading process from the skewed cubic structure, by which electrons and protons are refilled to the vacant terminal group so that the next charge separation dynamics can resume. After the fourth charge separation an oxygen molecule is generated. It is emphasized that the mechanisms of O2 generation should depend on the multiple channels of reloading.
Language	English
Publishing date	2019-04-17
Publishing country	England
Document type	Journal Article
ZDB-ID	1476244-4
ISSN	1463-9084 ; 1463-9076
ISSN (online)	1463-9084
ISSN	1463-9076
DOI	10.1039/d0cp00443j
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Article ; Online: On the Elementary Chemical Mechanisms of Unidirectional Proton Transfers: A Nonadiabatic Electron-Wavepacket Dynamics Study.

Yamamoto, Kentaro / Takatsuka, Kazuo

The journal of physical chemistry. A

2019 Volume 123, Issue 19, Page(s) 4125–4138

Abstract: We propose a set of chemical reaction mechanisms of unidirectional proton transfers, which may possibly work as an elementary process in chemical and biological systems. Being theoretically derived based on our series of studies on charge separation ... ...

Abstract	We propose a set of chemical reaction mechanisms of unidirectional proton transfers, which may possibly work as an elementary process in chemical and biological systems. Being theoretically derived based on our series of studies on charge separation dynamics in water splitting by Mn oxides, the present mechanisms have been constructed after careful exploration over the accumulated biological studies on cytochrome c oxidase (CcO) and bacteriorhodopsin. In particular, we have focused on the biochemical findings in the literature that unidirectional transfers of approximately two protons are driven by one electron passage through the reaction center (binuclear center) in CcO, whereas no such dissipative electron transfer is believed to be demanded in the proton transport in bacteriorhodopsin. The proposed basic mechanisms of unidirectional proton transfers are further reduced to two elementary dynamical processes, namely, what we call the coupled proton and electron-wavepacket transfer (CPEWT) and the inverse CPEWT. To show that the proposed mechanisms can indeed be materialized in a molecular level, we construct model systems with possible molecules that are rather familiar in biological chemistry, for which we perform the ab initio calculations of full-dimensional nonadiabatic electron-wavepacket dynamics coupled with all nuclear motions including proton transfers.
Language	English
Publishing date	2019-05-01
Publishing country	United States
Document type	Journal Article
ISSN	1520-5215
ISSN (online)	1520-5215
DOI	10.1021/acs.jpca.9b01178
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