耳机传送双重听觉信号的知觉特点研究

本研究探讨了耳机以叠加法和分离法传送双重听觉信号的知觉特点.实验结果表明(1)响度感觉是听觉中枢对同一信号的双耳输入强度加工整合的结果;(2)信号间的中枢干扰作用比外周干扰作用要小.前一论点在对三维虚拟听觉显示研究中也是应十分注意的.     

照明性质对辨认色标的影响

本研究对低亮度的四种色温白光和四种单色光下11种色标的绝对辨认结果进行了比较。结果表明:白光下的辨色效果优于色光。红、橙、黄、绿四种单色光中,红光的辨色效果最差。白光中高色温白光比低色温白光的辨色效果好。11种色标在辨认难度上存在差异,红、橙、橙黄、紫四种色标的辨认效果最好,白与黄、黑与深蓝最容易互相混淆。     

强背景光照射下,绿、红、橙三种颜色灯的亮度对辨认信号的影响

一、引言颜色信号灯是传递信息的重要手段。信号灯的色度和亮度,必须根据人眼对不同色光辨认的特点和使用的环境条件来确定。有些在全天候使用的灯光信号,背景光的强度相差几个对数级。夜晚眩目刺眼的灯光信号,在白天,特别在阳光照射时往往因亮度不足,难以觉察。要使灯光信号有效地发挥作用,就必须根据背景光的强度调节信号灯的亮度。因此确定颜色信号灯亮度与背景光强度间的关系对信号灯的设计和作用都有实际意义。在本研究中,我们对强背景光对识别绿、红、橙三种颜色灯光信号的影响进行了实验比较。     

不同背景照明光下正确辨认颜色灯光信号的亮度对比阈

本研究的目的是考察辨认颜色灯光信号的亮度对比阈与背景亮度的关系。实验采用了色温3100k和5000k两种照明光,信号灯的颜色分红、橙、绿三种。实验结果表明:(1)随着背景亮度的提高,亮度对比阈以递减速度下降;当背景亮度达到100cd/m~2以上时,亮度对比阈渐趋稳定。(2)在两种不同色温照明光下,色灯信号的辨认效果无明显差异。     

低色温低强度背景光照射下液晶显示颜色编码的实验研究

采用一台有源矩阵彩色液晶显示器作为主要实验装置,对低色温、低强度背景光照射下液晶显示颜色编码范围及其与色标大小的关系进行了研究。实验结果表明:(1)液晶显示器上色标大小对绝对辨认效果有显著影响,随着色标的增大,辨认错误率随之下降,但下降率则随色标的增大而递减。(2)在色温为3100K的低强度背景光照射下,液晶显示的颜色编码范围因色标大小不同而存在显著差异,当色标面积减小到1×1mm2至2×2mm2时,编码色数目仅限于3-4种。     

差距知觉的泛化效应：我和你之间的差距有多大?

当知晓自己和他人的表现,即自己与他人在某方面表现上的差距已经明确时,人们对自我-他人差异的知觉准确吗?本研究发现了差距知觉的泛化效应：人们将自身的绝对表现(自己的表现与零相比的结果)泛化到对自身相对表现(自己与他人相比的结果)的判断上。在7个研究中, 被试(N = 2766)得知自己的绝对表现和相对于他人的表现,并判断自己与他人之间的差距。结果显示,绝对获益时,人们在相对获益时感知到的自我-他人差距大于相对损失时;绝对损失时,人们在相对获益时感知到的自我-他人差距小于相对损失时;当泛化难以进行时,上述效应消失。研究揭示了差距知觉的泛化效应及其联结机制。     

面孔和汉字双关图的反转效应

面孔认知的反转效应已经得到了很多研究的证实.本研究使用结构信息改变的面孔、汉字和双关图作为实验材料.被试在经过面孔或者汉字的启动任务之后,可以将双关图知觉为面孔或者汉字.结果显示:在对面孔的相对辨认情景中,被试对反转面孔的反应时间显著长于正立面孔,存在反转效应.在对汉字的相对辨认情景中,正立和反转汉字的反应时间没有显著差异.这一结果表明反转效应不仅和结构信息有关,面孔专家化系统自上而下的激活对面孔反转效应起到重要的作用.     

大学生的职业自我概念清晰度与抑郁的关系:性别与性别平等观的调节作用

尽管抑郁的影响因素得到了比较多的探讨,但是鲜有研究探讨职业自我概念清晰度与抑郁的关系以及性别和性别平等观在其中的作用。根据生涯发展理论和自我差异理论,本研究探讨了大学生职业自我概念清晰度与大学生抑郁的关系,并考察了性别和性别平等观在二者关系之间的调节作用。通过对463份大学生的数据进行实证分析发现：（1）职业自我概念清晰度与大学生抑郁负相关;（2）职业自我概念清晰度与抑郁的关系存在显著的性别差异;（3）职业自我概念清晰度、性别和性别平等观对大学生抑郁存在三重交互作用。当个体持有高性别平等观时,男性和女性的职业自我概念清晰度都与抑郁负相关。当个体的性别平等观较低时,女性的职业自我概念清晰度与抑郁正相关。研究结果对于大学生的职业发展和心理健康教育具有重要实践意义。     

速示条件下辨认汉字与无意义图形的实验研究

本实验是对60名中国大学生进行的辨认汉字与无意义图形的速示研究。结果表明,无论是右利还是左利,多数人在辨认中显示出两脑均势的现象。其中汉字辨认无视野差异的占总实验人数的60％,无意义图形辨认无视野差异的占56.66％。这与用表音字对欧美人进行的研究不同,它意味着中国人在认知过程中可能具有特殊的方式。     

清晰度对自信预测效应的影响

清晰度是自我概念的一个重要特点。本研究采用自信心清晰度问卷、总体自信问卷、GHQ-20为工具,对自信水平、自信清晰度在自信对心理健康的预测效应中所起的作用进行了探讨。研究发现,自信水平、自信清晰度对心理健康均具有显著的预测作用;考虑清晰度后,自信水平对GHQ-焦虑、抑郁、自我肯定的回归效应被清晰度部分解;表明清晰度是自信预测效应的调节因素。     

Monaural Loudness Adaptation for Middle-Intensity Middle-Frequency Signals: The Importance of Measurement Technique

Using the Simple Adaptation technique (SA) and the Ipsilateral Comparison Paradigm (ICP), the authors studied monaural loudness adaptation to a middle-intensity [60 dB(A)] tone at signal frequencies of 250, 1000, and 4000 Hz in the left and right ears. Adaptation effects were absent when the SA procedure was used. However, they were observed uniformly across all frequency values with the ICP, a result that challenges the assertion in the literature, on the basis of SA measures, that loudness adaptation for middle-intensity signals occurs only at frequencies above 4000 Hz. The ICP features periodic intensity modulations (±10 dB relative to the base signal) to accommodate listeners' needs for referents by which they can gauge subtle changes in the loudness of the adapting tone, a key component that is missing in the SA method. Adaptation effects in this investigation were similar in both ears, supporting the equal susceptibility assumption common in loudness adaptation studies.     

Behavior-Based Assessment of the Auditory Abilities of Brushtail Possums

Brushtail possums (Trichosurus vulpecula) were trained to press a right lever when a tone was presented (a tone‐on trial) and a left lever when a tone was not presented (a tone‐off trial) to gain access to food. During training the tone was set at 80 dB(A), with a frequency of 0.88 kH for 3 possums and of 4 kH for the other 2. Once accuracy was over 90% correct across five consecutive sessions, a test session was conducted where the intensity of the tone was reduced by 8 dB(A) over blocks of 20 trials until accuracy over a block fell below 60%. After each test session, training sessions were reintroduced and continued until accuracy was again over 90%, when another test session was conducted. This process continued until there were at least five test sessions at that tone frequency. The same procedure was then used with frequencies of 0.20, 0.88, 2, 4, 10, 12.5, 15, 20, 30, and 35 kHz. Percentage correct and d' decreased approximately linearly for all possums as tone intensity reduced. Both sets of lines were shallowest at the higher frequencies and steepest at the lower frequencies. Hit and false alarm rates mirrored each other at high frequencies but were asymmetric at lower frequencies. Equal d' contours showed that sensitivity increased from 2 to 15 kHz and continued to be high over 20 to 35 kHz. The possums remained sensitive to the 20 to 35 kHz tones even at low intensities. The present study is the first to report the abilities of possum to detect tones over this range of frequencies and its results support the findings of a microelectrode mapping survey of possums' auditory cortex.     

Concurrent assessment of schedule and intensity control across successive discriminations

Two chinchillas were trained on a series of two-valued auditory intensity discriminations. Lever presses were reinforced when no tone was present and not reinforced in the presence of a four-kiloHertz tone. The intensity of the nonreinforced tone was successively decreased, increasing the difficulty of the discrimination, until differential responding resembled that on a mixed schedule (no-tone–no-tone). Response data were partitioned in such a way as to provide a continuing assessment of the relative amounts of control exerted by the reinforcement schedule and the sound intensity, respectively. Control by reinforcement density was a direct function of discrimination difficulty, whereas the control exerted by intensity was inversely related to difficulty. For these chinchillas, the absolute threshold value obtained at four kiloHertz was about two decibels referenced to 20 microNewtons per meter squared.     

Effects of a contralateral interference tone on auditory recognition

The effects of a contralateral interference tone on identification of the frequency of a brief signal were investigated. The signal was a 20-reset sinusoid and was the same intensity as the 500-msec interference tone. Changes in frequency discrimination were measured as a function of the temporal intee, al between rdgnal and interference tone. Frequency discrimination was unaffected by the presence of a leading interference torte. However, the addition of a trailing interference tone produced a small (about 15%) decrement in performance relative to discriminability measured in quiet. In contrast to the data and supporting theory of Massaro (1970) percent correct identification did not vary appreciably with intertone interval. The present data suggest that interference effects previously obtained with untrained Os ;are greatly attenuated for well-practiced Ss     

Absolute pitch in infancy and adulthood: the role of tonal structure

Despite many similarities in infant and adult auditory processing, the literature suggests that two aspects of music perception, pitch processing and knowledge of tonal structure, change over development. The current experiments assess the use of absolute and relative pitch cues in a tone sequence statistical learning task containing tonal structure. The results suggest that infants preferentially process absolute pitch patterns in continuous tone sequences, supporting the hypothesis that absolute pitch is present in infancy, whereas adults tracked both absolute and relative pitch patterns. Infants and adults detected the tonal structure in the input, suggesting that humans are attuned to basic aspects of tonality early in life.     

Signal detection and matching: analyzing choice on concurrent variable-interval schedules.

Pigeons' pecks on a red key and a green key were followed by access to grain according to pairs of concurrent independent variable-interval schedules in a combined signal detection/matching law paradigm. Pecks on the red key were reinforced by the richer variable-interval schedule if a short-duration tone had been presented; pecks on the green key were reinforced by the richer variable-interval schedule if a long-duration tone had been presented. Pecks on the green key given a short-duration tone, or on the red key given a long-duration tone, were reinforced by the leaner variable-interval schedule. The data were analyzed according to both signal detection's and the matching law's separate measures of, first, the discrimination of the choices and, second, the bias to make one response or another. Increasing the difficulty of the tone-duration discrimination decreased both methods' measures of the discrimination of the choices and did not change both methods' measures of the bias to make one response or another. Changing the leaner variable-interval schedule so that it approached the richer variable-interval schedule decreased signal detection's measure of discrimination but left its measure of response bias and the matching law measures unchanged. Data collected only until a subject's first changeover response following presentation of a long or a short tone showed higher values for both methods' measures of discrimination, no change in signal detection's measure of response bias, and lower values for the matching law's measure of response bias. Relationships between the matching law's and signal detection's methods of analyzing choice are discussed. It is concluded that a signal detection analysis is more efficient for examining changes in the difficulty of a discrimination, whereas a matching law analysis is more effective for examining the effects of changes in relative reinforcer frequency.     

What is the signal in signal detection?

This study concerns the nature of the stimulus represented along the decision axis in the yes/no auditory detection task. Two contrasting interpretations, absolute and difference representation of the stimulus, are tested by raising the carrier tone embedded within the background “noise” to the level of the signal, on occasional “catch” trials. Results indicate that difference detection may be the preferred mode of operation when a carrier tone is present and the task is a difficult one. Implications for the TSD model are discussed in terms of the relative efficiency of the two detection mechanisms.     

Changing the tune: the structure of the input affects infants' use of absolute and relative pitch

Sequences of notes contain several different types of pitch cues, including both absolute and relative pitch information. What factors determine which of these cues are used when learning about tone sequences? Previous research suggests that infants tend to preferentially process absolute pitch patterns in continuous tone sequences, while other types of input elicit relative pitch use by infants. In order to ask whether the structure of the input influences infants’ choice of pitch cues, we presented learners with continuous tone streams in which absolute pitch cues were rendered uninformative by transposing the tone sequences. Under these circumstances, both infants and adults successfully tracked relative pitches in a statistical learning task. Implications for the role played by the structure of the input in the learning process are considered.     

Differential responding without differential reinforcement: Intensity difference, continuum position, and reinforcement density effects

The response rates of five groups of rats were observed during exposure to different intensities of a four kilohertz tone within a two-component multiple schedule of nondifferential reinforcement. Response rates were found to be higher during the multiple schedule component which contained the higher intensity tone. Larger differences in response rates between the two multiple schedule components occurred with greater intensity separations (30 versus 20 decibels). At the 30 decibel separation a low absolute magnitude produced larger response rate differences than a high absolute magnitude, while at the 20 decibel separation a high absolute magnitude produced larger response rate differences. Increases in reinforcement density were accompanied by decreases in response rate differences between high and low intensity components only when over-all response rates also increased.     

Detection and recognition of increments and decrements in auditory intensity

Os’ performance in the detection of increments and decrements in the intensity of a pure tone was compared with their performance in an increment-decrement recognition experiment. Recognition performance improved, relative to detection performance, as signal duration increased. This is surprising from the point of view of all stimulus models within signal detection theory. These data and others are described in terms of a change detection mechanism.