Irrelevant Speech Effect Research Articles

Creating a sound-designed sound masking signal for open-plan offices that is both pleasant and has a positive impact on cognitive performance.

In open-plan offices, sound masking is often used to lower speech intelligibility and raise cognitive performance of the employees by reducing the irrelevant speech effect. Classic sound masking methods use speakers built into the ceiling of the office to increase the overall background noise level in the office and reduce speech intelligibility. However, the emergence of activity based offices is increasing the need for personalized sound masking methods that are no longer used globally in the office, but can be controlled by each employee individually depending on their activity and, for example, played back through headphones during activities that require particularly intense concentration. The playback of a classical sound-masking noise (e.g. a simple pink noise filtered by -5 dB per octave) via headphones is effective, but not pleasant. For this reason, a new sound-designed masking signal was developed in the present study, which consists of slowly fluctuating binaural harmonic components, as well as atmospheric sounds like water sounds and masking noise. A listening test with a cognitive task and a survey after each test condition showed that the developed signal had a similar positive effect on cognitive performance as a classical masking noise, but was rated as significantly more pleasant.

Exploring the cognitive mechanism of irrelevant speech effect in Chinese reading: Evidence from eye movements

Exploring the cognitive mechanism of irrelevant speech effect in Chinese reading: Evidence from eye movements

The effects of background music on neural responses during reading comprehension

The effects of background speech or noise on visually based cognitive tasks has been widely investigated; however, little is known about how the brain works during such cognitive tasks when music, having a powerful function of evoking emotions, is used as the background sound. The present study used event-related potentials to examine the effects of background music on neural responses during reading comprehension and their modulation by musical arousal. Thirty-nine postgraduates judged the correctness of sentences about world knowledge without or with background music (high-arousal music and low-arousal music). The participants’ arousal levels were reported during the experiment. The results showed that the N400 effect, elicited by world knowledge violations versus correct controls, was significantly smaller for silence than those for high- and low-arousal music backgrounds, with no significant difference between the two musical backgrounds. This outcome might have occurred because the arousal levels of the participants were not affected by the high- and low-arousal music throughout the experiment. These findings suggest that background music affects neural responses during reading comprehension by increasing the difficulty of semantic integration, and thus extend the irrelevant sound effect to suggest that the neural processing of visually based cognitive tasks can also be affected by music.

Irrelevant music: How suprasegmental changes of a melody\u2019s tempo and mode affect the disruptive potential of music on serial recall

On tests of verbal short-term memory, performance declines as a function of auditory distraction. The negative impact of to-be-ignored sound on serial recall is known as the irrelevant sound effect. It can occur with speech, sine tones, and music. Moreover, sound that changes acoustically from one token to the next (i.e., changing-state sound) is more disruptive to serial recall than repetitive, steady-state sound. We tested manipulations that resulted in changes in (higher levels of) perceptual organization for more complex tonal stimuli. Within a trial, the first two bars of a well-known melody were repeated (a) in the exact same manner, (b) with variations only in tempo, (c) with variations only in mode (e.g., Dorian or Phrygian), or (d) with variations in both tempo and mode. Participants serially recalled digits in each of the irrelevant sound conditions as well as in a silent control condition. In Experiment 1a, we tested non-music students and, to investigate whether musical expertise affected the findings, additionally tested students majoring in music in Experiment 1b. Across both samples, recall in the irrelevant sound conditions was significantly poorer than in the silent control condition, but only the tempo variation caused an additional harmful effect. The mode variation did not affect recall performance, in either music or non-music students. These findings indicate that, at least with music, changes are a matter of degree and not every additional variation impairs recall performance.

Decomposing the Role of Rehearsal in Auditory Distraction during Serial Recall

ABSTRACT According to the interference-by-process mechanism of auditory distraction, irrelevant changing sounds interfere with subvocal articulatory-motor sequencing during rehearsal. However, previous attempts to limit rehearsal with concurrent articulation and examine the residual irrelevant sound effect have limited both cumulative rehearsal as well as the initial assembly of articulatory-phonological labels. The current research decomposed rehearsal into these two levels of articulatory-phonological sequencing: silent concurrent articulation limits the availability of both serial repetition and articulatory-phonological recoding; rapid serial visual presentation allows for articulatory-phonological recoding but presents items too quickly for cumulative serial repetition. As predicted by the interference-by-process account, concurrent articulation – but not rapid serial visual presentation – reduced the irrelevant sound effect. Not only did the irrelevant sound effect persist in the face of rapid serial visual presentation, a steady-state effect also emerged. These findings indicate that irrelevant sounds interfere with both serial processing of articulatory-motor planning at the word level as well as in the formation of item-to-item associations created via serial repetition of complete items. Moreover, these findings highlight the benefits of articulatory-phonological recoding – independent of pure rehearsal – within serial recall.

When is forewarned forearmed? Predicting auditory distraction in short-term memory.

Two experiments critically examined a predictive-coding based account of the vulnerability of short-term memory (STM) to auditory distraction, particularly the disruptive effect of changing-state sound on verbal serial recall. Experiment 1 showed that providing participants with the opportunity to predict the contents of an imminent spoken distractor sentence via a forewarning reduced its particularly disruptive effect but only to the same level of disruption as that produced by simpler changing-state sequences (a sequence of letter-names). Moreover, a postcategorically unpredictable changing-state sequence (e.g., "F, B, H, E, . . .") was no more disruptive than a postcategorically predictable sequence ("A, B, C, D, . . ."). Experiment 2 showed that a sentence distractor was disruptive regardless of whether participants reported adopting a serial rehearsal strategy to perform the focal task (in this case, a missing-item task) whereas, critically, the disruptive effect of simpler changing-state sequences was only found in participants who reported using a serial rehearsal strategy. Moreover, when serial rehearsal was not used to perform the focal task, the disruptive effect of sentences was completely abolished by a forewarning. These results indicate that predictability plays no role in the classical changing-state irrelevant sound effect and that foreknowledge selectively attenuates a functionally distinct stimulus-specific attentional-diversion effect. As such, the results are at odds with a unitary, attentional account of auditory distraction in STM and instead strongly support a duplex-mechanism account. (PsycINFO Database Record (c) 2020 APA, all rights reserved).

Distraction at the cocktail party: Attenuation of the irrelevant speech effect after a training of auditory selective attention.

Task-irrelevant auditory stimuli such as speech are known to disrupt the retention of serial information held in verbal short-term memory (STM). Although such effects of irrelevant sound are typically very robust, there is evidence suggesting that some forms of auditory distraction are susceptible to cognitive control or auditory attention. In the present study, we tested whether an extensive training of auditory selective attention reduces the degree of interference produced by irrelevant speech in a serial STM task. Participants (n = 38) were trained on an adaptive dichotic-listening task requiring selective processing of a varying list of verbal items presented via headphones while ignoring auditory distractors presented simultaneously either by a different voice or in the irrelevant ear. The number of target items that could be memorized increased throughout 5 training sessions, suggesting improvement of auditory selective attention in a dichotic-listening situation. An active control group (n = 37) was trained on an auditory duration discrimination task for 5 sessions. Prior to the training, task-irrelevant speech was shown to interfere with serial recall in both groups. After the training, however, the irrelevant speech effect was attenuated in the group that was trained on the dichotic-listening task, whereas no reduction of auditory distraction was observed in the active control group. The results show that the interference produced by task-irrelevant speech can be reduced through an extensive dichotic-listening training, suggesting that the irrelevant speech effect is susceptible to auditory selective attention. (PsycINFO Database Record (c) 2019 APA, all rights reserved).

Irrelevant speech effect in open plan offices: Comparison of two models explaining the decrease in performance by speech intelligibility and attempt to reduce interindividual differences of the mental workload by task customisation

For employees working in open plan offices, speech noise is now recognised as the main source of disturbance. In the literature, a series of studies on open spaces have found that the increased speech intelligibility happens to decrease the performance during a short-term memory task. The theoretical model proposed by Hongisto relates the decreased performance (DP) to the Speech Transmission Index (STI). The model predicts that for STI values from 0.7 to 1, which correspond to a speech signal with an intelligibility of almost 100%, the DP remains constant at 7%, but few studies have examined the high end of this range. Here, we investigated the relationship between the DP and the STI by varying the STI up to 0.9. Fifty-five subjects between 25- and 59-years-of-age participated in the experiment. Subjects performed a short-term memory task in silence and in four different sound conditions (STI from 0.25 to 0.9). The task itself was personalised by prior measurement of mnemonic span. It was thus possible to define two different cognitive loads (low/high) based on the mnemonic span value determined for each subject. Subjects subjectively assessed the mental workload and sound annoyance at the end of each short-term memory task in each sound condition. Significant interactions between STI and DP, mental workload and sound annoyance were found. In addition, the age of subjects correlated significantly with their performance during the short-term memory task.

Are individual differences in auditory processing related to auditory distraction by irrelevant sound? A replication study

Irrelevant sounds can be very distracting, especially when trying to recall information according to its serial order. The irrelevant sound effect (ISE) has been studied in the literature for more than 40 years, yet many questions remain. One goal that has received little attention involves the discernment of a predictive factor, or individual difference characteristic, that would help to determine the size of the ISE. The current experiments were designed to replicate and extend prior work by Macken, Phelps, and Jones (Psychonomic Bulletin & Review, 16, 139–144, 2009), who demonstrated a significant predictive relationship between the size of the ISE and a type of auditory processing called global pattern matching. The authors also found a relationship between auditory processing involving deliberate recoding of sounds and serial order recall performance in silence. Across two experiments, this dissociation was not replicated. Additionally, the two types of auditory processing were not significantly correlated with each other. The lack of a clear pattern of findings replicating the Macken et al. (Psychonomic Bulletin & Review, 16, 139–144, 2009) study raises several questions regarding the need for future research on the characteristics of these auditory processing tasks, and the stability of the measurement of the ISE itself.

Determinants of the irrelevant speech effect: Changes in spectrum and envelope.

The irrelevant sound effect (ISE) denotes the fact that short-term memory is disrupted while being exposed to sound. The ISE is largest for speech. The presented study investigated the underlying acoustic properties that cause the ISE. Stimuli contained changes in either the spectral content only, the envelope only, or both. For this purpose two experiments were conducted and two vocoding strategies were developed to degrade the spectral content of speech and the envelope independently. The first strategy employed a noise vocoder that was based on perceptual dimensions, analyzing the original utterance into 1, 2, 4, 8, or 24 channels (critical bands) and independently manipulating loudness. The second strategy involved a temporal segmentation of the signal, freezing either spectrum or level for durations ranging from 50 ms to 14 s. In both experiments, changes in envelope alone did not have measurable effects on performance, but the ISE was significantly increased when both the spectral content and the envelope varied. Furthermore, when the envelope changes were uncorrelated with the spectral changes, the effect size was the same as with a constant-loudness envelope. This suggests that the ISE is primarily caused by spectral changes, but concurrent changes in level tend to amplify it.

Irrelevant speech effects with locally time-reversed speech: Native vs non-native language.

Irrelevant speech is known to interfere with short-term memory of visually presented items. Here, this irrelevant speech effect was studied with a factorial combination of three variables: the participants' native language, the language the irrelevant speech was derived from, and the playback direction of the irrelevant speech. We used locally time-reversed speech as well to disentangle the contributions of local and global integrity. German and Japanese speech was presented to German (n = 79) and Japanese (n = 81) participants while participants were performing a serial-recall task. In both groups, any kind of irrelevant speech impaired recall accuracy as compared to a pink-noise control condition. When the participants' native language was presented, normal speech and locally time-reversed speech with short segment duration, preserving intelligibility, was the most disruptive. Locally time-reversed speech with longer segment durations and normal or locally time-reversed speech played entirely backward, both lacking intelligibility, was less disruptive. When the unfamiliar, incomprehensible signal was presented as irrelevant speech, no significant difference was found between locally time-reversed speech and its globally inverted version, suggesting that the effect of global inversion depends on the familiarity of the language.

The Role of Talker Familiarity in Auditory Distraction.

The current research employed a classic irrelevant sound effect paradigm and investigated the talker-specific content of the irrelevant speech. Specifically, we aimed to determine if the participants' familiarity with the irrelevant speech's talker affected the magnitude of the irrelevant sound effect. Experiment 1 was an exploration of talker familiarity established in a natural listening environment (i.e., a university classroom) in which we manipulated the participants' relationships with the talker. In Experiment 2, we manipulated the participants' familiarity with the talker via 4 days of controlled exposure to the target talker's audio recordings. For both Experiments 1 and 2, a robust effect of irrelevant speech was found; however, regardless of the talker manipulation, talker familiarity did not influence the size of the effect. We interpreted the results within the processing view of the auditory distraction effect and highlighted the notion that talker familiarity may be more vulnerable than once thought.

Two simultaneous talkers distract more than one in simulated multi-talker environments, regardless of overall sound levels typical of open-plan offices

The irrelevant speech effect (ISE) characterizes detriment to cognitive task performance in the presence of irrelevant speech. This paper examines whether the ISE varies due to the number of simultaneously active nearby talkers (for up to two talkers), or the overall sound level, within the context of a simulated open-plan office. Two experiments were conducted within a climate-controlled chamber that was set-up as a medium-sized open-plan office. The cognitive tasks performed by the participants included the digit recall task, and a writing task, within a room acoustic simulation of realistic multi-talker speech from spatially separated talkers. Within Experiment 1 (n = 60), an increase in the number of talkers from none (T0) to one (T1), and from one to two (T2) simultaneous talkers resulted in statistically significant decline in the digit recall task performances, with effect sizes of 24% (i.e., T1 vs. T0), and 12% (i.e., T2 vs. T1), respectively. The pauses between words during the writing task were similar for T0 and T1, but showed a statistically significant increase within T2 vs. T1, with an effect size of 12%. The findings of Experiment 1 are inconsistent with the maximally distracting status attributed to T1 in some studies, but is consistent with findings in other studies. Within Experiment 2 (n = 62), the cognitive performance in T2 remained largely invariant between 45 and 57 dB (A-weighted sound pressure levels), which represents a typical range of levels within open-plan offices. This finding is somewhat consistent with previous studies, where the ISE has been shown to be invariant over large changes to the overall level of more-or-less spatially-static single-talker speech. However, the current findings provide a more ecologically-valid representation of multi-talker level-invariance of the ISE. In general, these findings have relevance for characterizing auditory distraction within complex multi-talker environments; both in laboratory studies and actual open-plan offices.

Auditory distraction does more than disrupt rehearsal processes in children's serial recall.

As children mature, their ability to remember information improves. This improvement has been linked to changes in verbal control processes such as rehearsal. Rehearsal processes are thought to undergo a quantitative shift around 7 years of age; however, direct measurement of rehearsal is difficult. We investigated a measure of rehearsal ability in children and compared this measurement to serial recall performance in the presence of auditory distractors. Theories of auditory distraction effects in children rely upon a combination of attentionally based and serial-order-based processes (Elliott et al. in Journal of Memory and Language, 88, 39-50, 2016); the present work contributes to the understanding of auditory distraction effects by measuring both types of processes within one study. Children completed an individually adjusted serial-recall task with auditory distractors. To assess rehearsal, each child's proportionalized articulatory difference (PAD) score was calculated from performance on adaptive digit span tasks performed in quiet and under articulatory suppression (see also Jarrold & Citroën in Developmental Psychology, 49, 837-847, 2013). Attentional processes were measured in two ways: first, by using complex span tasks, and second, by children's vulnerability to disruption in the context of irrelevant sound. The results indicated that the rehearsal measure was significantly related to the auditory distraction effect, but this relation was isolated to the attentional-diversion component of the irrelevant-sound effect. The results provide preliminary evidence that children consume attentional resources during rehearsal. Moreover, irrelevant sound disrupts children's rehearsal not solely through automatic, obligatory conflict. Rather, irrelevant sound diverts children's attention, which prevents attentional resources from supporting rehearsal processes.

Irrelevant sound effects with locally time-reversed speech: Speech reversal and language familiarity

Irrelevant sound effects with locally time-reversed speech: Speech reversal and language familiarity

Irrelevant sound effects with locally time-reversed speech: Native vs. non-native language

Irrelevant sound effects with locally time-reversed speech: Native vs. non-native language

Postcategorical auditory distraction in short-term memory: Insights from increased task load and task type.

Task-irrelevant speech impairs short-term serial recall appreciably. On the interference-by-process account, the processing of physical (i.e., precategorical) changes in speech yields order cues that conflict with the serial-ordering process deployed to perform the serial recall task. In this view, the postcategorical properties (e.g., phonology, meaning) of speech play no role. The present study reassessed the implications of recent demonstrations of auditory postcategorical distraction in serial recall that have been taken as support for an alternative, attentional-diversion, account of the irrelevant speech effect. Focusing on the disruptive effect of emotionally valent compared with neutral words on serial recall, we show that the distracter-valence effect is eliminated under conditions-high task-encoding load-thought to shield against attentional diversion whereas the general effect of speech (neutral words compared with quiet) remains unaffected (Experiment 1). Furthermore, the distracter-valence effect generalizes to a task that does not require the processing of serial order-the missing-item task-whereas the effect of speech per se is attenuated in this task (Experiment 2). We conclude that postcategorical auditory distraction phenomena in serial short-term memory (STM) are incidental: they are observable in such a setting but, unlike the acoustically driven irrelevant speech effect, are not integral to it. As such, the findings support a duplex-mechanism account over a unitary view of auditory distraction. (PsycINFO Database Record

Registered Replication Report: Testing Disruptive Effects of Irrelevant Speech on Visual-Spatial Working Memory

<p class="p1">A Partial Replication of “Functional Equivalence of Verbal and Spatial Information in Serial Short-Term Memory (Jones, Farrand, Stuart, &amp; Morris, 1995; Experiment 4)” <p class="p1"> <p class="p1">The irrelevant speech effect (ISE)—the phenomenon that background speech impairs serial recall of visually presented material—has been widely used for examining the structure of short-term memory. In Experiment 4, Jones, Farrand, Stuart, and Morris (1995) employed the ISE to demonstrate that impairment of performance is determined by the changing-state characteristics of the material, rather than its modality of origin. The present study directly replicated the spatial condition of Experiment 4 with <em>N</em> = 40 German participants. In contrast to the original findings, no main effect of sound type was observed, <em>F</em>(2, 78) = 0.81, <em>p</em> = .450, η²<em>_p</em> = .02. The absence of an ISE in the spatial domain does not support the changing state hypothesis.

Similarities between the irrelevant sound effect and the suffix effect

Although articulatory suppression abolishes the effect of irrelevant sound (ISE) on serial recall when sequences are presented visually, the effect persists with auditory presentation of list items. Two experiments were designed to test the claim that, when articulation is suppressed, the effect of irrelevant sound on the retention of auditory lists resembles a suffix effect. A suffix is a spoken word that immediately follows the final item in a list. Even though participants are told to ignore it, the suffix impairs serial recall of auditory lists. In Experiment 1, the irrelevant sound consisted of instrumental music. The music generated a significant ISE that was abolished by articulatory suppression. It therefore appears that, when articulation is suppressed, irrelevant sound must contain speech for it to have any effect on recall. This is consistent with what is known about the suffix effect. In Experiment 2, the effect of irrelevant sound under articulatory suppression was greater when the irrelevant sound was spoken by the same voice that presented the list items. This outcome is again consistent with the known characteristics of the suffix effect. It therefore appears that, when rehearsal is suppressed, irrelevant sound disrupts the acoustic-perceptual encoding of auditorily presented list items. There is no evidence that the persistence of the ISE under suppression is a result of interference to the representation of list items in a postcategorical phonological store.

The irrelevant speech effect in multi-talker environments: Applications to open-plan offices

Irrelevant speech from co-workers has consistently been listed as one of the major nuisances within open-plan work environments. To explore the psychoacoustic basis of the so-called irrelevant speech effect (ISE; which causes cognitive decline and increases acoustic distraction) within a multi-talker context, a series of laboratory-based experiments were run. These experiments used room acoustical simulations of various open-plan office environments within a climate-controlled chamber to test several factors relevant to the ISE. These factors included the number of simultaneously active talkers, their spatial arrangements, sound pressure levels and the semanticity of speech. The main findings thus far indicate that multi-talker speech lead to a stronger ISE than speech from a single talker, which further interacts with the overall sound level, semanticity, etc., to exhibit a more complicated effect than what has been proposed in previous studies. The effect of the number of active talkers alone suggests reconsiderations of some assumptions in the ISO 3382-3. More generally, the perception of speech “babble” seems to be affected by multiple factors in a realistic working environment. Some of our research is directly related to characterising speech babble and its function as a beneficial sound masker in multi-talker environments.Irrelevant speech from co-workers has consistently been listed as one of the major nuisances within open-plan work environments. To explore the psychoacoustic basis of the so-called irrelevant speech effect (ISE; which causes cognitive decline and increases acoustic distraction) within a multi-talker context, a series of laboratory-based experiments were run. These experiments used room acoustical simulations of various open-plan office environments within a climate-controlled chamber to test several factors relevant to the ISE. These factors included the number of simultaneously active talkers, their spatial arrangements, sound pressure levels and the semanticity of speech. The main findings thus far indicate that multi-talker speech lead to a stronger ISE than speech from a single talker, which further interacts with the overall sound level, semanticity, etc., to exhibit a more complicated effect than what has been proposed in previous studies. The effect of the number of active talkers alone suggests r...