Preperceptual and perceptual organization of sound

描述(由申请人提供) 这项研究将主要在匈牙利进行，作为国家卫生研究院#R01 DC 04263号补助金的延伸。拟议研究的目标是描述导致感知不同声源的过程的特征。我们之前的结果(见初步结果)证实，很大一部分听觉组织是在预感中发生的。拟议研究的目的是确定感知到的来源分离是否是单一过程的结果，或者听觉组织在达到感知之前是否经历了几个不同的阶段。找到一个与所感知的组织不同的预感组织将支持多阶段过程的概念。为了达到这一目标，我们将使用事件相关电位(ERPs)的高时间分辨率与行为方法相结合，在不同的实验条件下比较刺激驱动的听觉过程的结果与对相同声音的注意处理产生的感知。这将使我们能够评估听觉组织的处理阶段，并确定知觉组织中有多少是严格受刺激驱动的，有多少可以被注意过程改变。FIRCA的提案将在家长拨款的具体目标2(“注意力和刺激驱动的感知过程之间的相互作用”)上进行扩展。为了解决这一目标，提出了三个实验。实验1将确定知觉健全组织在多大程度上对应于可评估的前知觉组织。实验2将考察多个线索(两个或多个听觉特征中的两组声音之间的差异)在分离声源中被汇总到听觉加工的哪个阶段。实验3将测试相同两组声音的不同声音组织(即整合组织和分离组织)是否可以在可评估的前知觉加工阶段并行存在。

DESCRIPTION (provided by applicant) This research will be done primarily in Hungary as an extension of NIH Grant #R01 DC 04263. The goal of the proposed research is to characterize the processes leading to the perception of distinct sound sources. Our previous results (see Preliminary Results) established that a large part of auditory organization occurs preperceptually. The aim of the proposed research is to determine whether the perceived segregation of sources is the result of a single process or whether auditory organization goes through several distinct phases before reaching perception. Finding a preperceptual organization that differs from the perceived organization would support the notion of a multi-stage process. To reach this goal we will use the high temporal resolution of event-related potentials (ERPs) in conjunction with behavioral methods to compare the outcome of stimulus-driven auditory processes with the perception resulting from attentive processing of the same sounds, across various experimental conditions. This will allow us to evaluate the processing stages of auditory organization and determine how much of the perceptual organization is strictly stimulus driven and how much can he altered by attentional processes. The FIRCA proposal will expand on Specific Aim 2 of the parent grant ("the interplay between attention and stimulus-driven processes in perception"). Three experiments are proposed to address this aim. Experiment 1 will determine to what extent perceptual sound organization corresponds to an assessable preperceptual organization. Experiment 2 will investigate what stage of auditory processing are multiple cues (differences between two sets of sounds in two or more auditory features) summed in segregating sound sources. Experiment 3 will test whether alternative sound organizations (i.e., the integrated and the segregated organizations) of the same two sets of sounds can exist in parallel at an assessable preperceptual processing stage.