目光注视在人类社交以及捕获和维持注意方面发挥重要作用。但是,目光注视如何与客体交互以引导注意分配至今尚不明确。因此,本研究采用双框线索范式,以具有两种注视方向(直视或回避)的面孔或实物作为客体,通过操纵线索到目标间的SOA来...目光注视在人类社交以及捕获和维持注意方面发挥重要作用。但是,目光注视如何与客体交互以引导注意分配至今尚不明确。因此,本研究采用双框线索范式,以具有两种注视方向(直视或回避)的面孔或实物作为客体,通过操纵线索到目标间的SOA来考察目光注视对客体注意的影响及作用机制。实验1发现,目光注视对客体效应的影响只出现在300 ms SOA时;进一步分析发现,客体效应的差异来自于直视条件下被试对无效相同客体位置上的目标比回避条件下反应更快。这表明与回避目光相比,直视更能捕获我们的注意,从而产生更大的客体效应。实验2将面孔对比度反转,排除了低水平物理特征对实验1结果的影响。实验3使用两种注视方向的眼睛叠加杯子作为客体,以探究目光注视效应是否能扩展到其他客体中,结果与实验1相同。本研究结果表明,目光注视能够与客体交互共同引导注意分配,直视更能捕获注意,但受SOA的影响,上述结果支持了感觉增强理论。展开更多
We demonstrate the feasibility of simultancous multi-probe detection for an optcal-resolution photoacoustic microscopy(OR-PAM)system.OR-P AM has elicited the attention of biomedical imaging researchers because of its ...We demonstrate the feasibility of simultancous multi-probe detection for an optcal-resolution photoacoustic microscopy(OR-PAM)system.OR-P AM has elicited the attention of biomedical imaging researchers because of its optical absorption contrast and high spatial resolution with great imaging depth.OR-PAM allows label-free and noninvasive imaging by maximizing the optical absorption of endogenous biomolecules.However,given the inadequate absoption of some biomolcules,detection sensitivity at the same incident intensity requires improvement.In this study,a modulated continuous wave with power density less than 3mW/cm^(2)(1/4 of the ANSI safety limit)excited the weak photoacoustic(PA)signals of biological cells.A microcavity traneducer is developed based on the bulk modulus of gas five orders of magnitude lower than that of solid;air pressure variation is inversely proportional to cavity volume at the same temperature increase.Considering that a PA wave expands in various directions,detecting PA signals from different positions and adding them together can increase detection sensitivity and signal-to-noise ratio.Therefore,we employ four detectors to acquire tiny PA signals simul-taneously.Experimental results show that the developed OR-PAM system allows the label-free imaging of cells with weak optical absorption.展开更多
文摘目光注视在人类社交以及捕获和维持注意方面发挥重要作用。但是,目光注视如何与客体交互以引导注意分配至今尚不明确。因此,本研究采用双框线索范式,以具有两种注视方向(直视或回避)的面孔或实物作为客体,通过操纵线索到目标间的SOA来考察目光注视对客体注意的影响及作用机制。实验1发现,目光注视对客体效应的影响只出现在300 ms SOA时;进一步分析发现,客体效应的差异来自于直视条件下被试对无效相同客体位置上的目标比回避条件下反应更快。这表明与回避目光相比,直视更能捕获我们的注意,从而产生更大的客体效应。实验2将面孔对比度反转,排除了低水平物理特征对实验1结果的影响。实验3使用两种注视方向的眼睛叠加杯子作为客体,以探究目光注视效应是否能扩展到其他客体中,结果与实验1相同。本研究结果表明,目光注视能够与客体交互共同引导注意分配,直视更能捕获注意,但受SOA的影响,上述结果支持了感觉增强理论。
基金supported by the National Natural Science Foundation of China(Grant No.61178086)Science and Technology Program of Guangzhou,China(Grant No.2012J4300138)Foundation for Distinguished Young Talents in South China Normal University,China.(Grant No.2012KJ010).
文摘We demonstrate the feasibility of simultancous multi-probe detection for an optcal-resolution photoacoustic microscopy(OR-PAM)system.OR-P AM has elicited the attention of biomedical imaging researchers because of its optical absorption contrast and high spatial resolution with great imaging depth.OR-PAM allows label-free and noninvasive imaging by maximizing the optical absorption of endogenous biomolecules.However,given the inadequate absoption of some biomolcules,detection sensitivity at the same incident intensity requires improvement.In this study,a modulated continuous wave with power density less than 3mW/cm^(2)(1/4 of the ANSI safety limit)excited the weak photoacoustic(PA)signals of biological cells.A microcavity traneducer is developed based on the bulk modulus of gas five orders of magnitude lower than that of solid;air pressure variation is inversely proportional to cavity volume at the same temperature increase.Considering that a PA wave expands in various directions,detecting PA signals from different positions and adding them together can increase detection sensitivity and signal-to-noise ratio.Therefore,we employ four detectors to acquire tiny PA signals simul-taneously.Experimental results show that the developed OR-PAM system allows the label-free imaging of cells with weak optical absorption.
