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Increasing evidence suggests that cognitive-control processes can be configured to optimize either persistence of information processing by amplifying competition between decision-making alternatives and top-down biasing of this competition or flexibility by dampening competition and biasing. We investigated whether high-frequency binaural beats, an auditory illusion suspected to act as a cognitive enhancer, have an impact on cognitive-control configuration.
We hypothesized that binaural beats in the gamma range bias the cognitive-control style toward flexibility, which in turn should increase the crosstalk between tasks in a dual-task paradigm. We replicated earlier findings that the reaction time in the first-performed task is sensitive to the compatibility between the responses in the first and the second task—an indication of crosstalk. As predicted, exposing participants to binaural beats in the gamma range increased this effect as compared to a control condition in which participants were exposed to a continuous tone of Hz.
These findings provide converging evidence that the cognitive-control style can be systematically biased by inducing particular internal states; that high-frequency binaural beats bias the control style toward more flexibility; and that different styles are implemented by changing the strength of local competition and top-down bias. The concept of cognitive control refers to processes that are not directly involved in processing and selecting stimulus events or actions but that rather orchestrate the processes responsible for these basic functions.
Control processes are commonly characterized in terms of their capacity limitations but there is increasing evidence that they can also vary in style. Following these leads, Hommel has suggested that the style of control varies between persistence and flexibility: while the former implies what is a frequency claim in psychology focused, exclusive processing, the latter implies a broad distribution of resources and rather integrative processing.
There are increasing attempts to identify means to bias metacontrol states in systematic ways, which is of both theoretical and practical relevance. It is of theoretical relevance because the characterization of effective means to bias the metacontrol state or control style provides constrains for understanding its underlying functional and neural mechanisms. And it is of practical relevance because effective means point to interesting methods for individually tailored cognitive enhancement, which for instance might seek to support individuals to implement particularly adaptive states according to their needs.
The present study assessed an enhancement technique that has been frequently claimed to target cognitive control functions: binaural beats—the subjective experience of a beating tone with a frequency that corresponds to the frequency difference between two binaurally presented tones Oster, Originally, binaural beats of low frequency have been argued to induce mental relaxation while high frequencies were assumed to induce alertness and attentional concentration Vernon, ; Turow and Lane, This would suggest that high-frequency beats bias cognitive control toward persistence and focus, but recent findings suggest the exact opposite.
In a recent study, we presented participants with high-frequency binaural beats gamma rangelow-frequency binaural beats alpha rangeor a continuous tone of Hz Reedijk et al. In this task, participants are presented with two visual targets in a rapid stream of stimuli, which commonly leads to the observation that they often miss the second target if it is presented briefly after the first. The what is combustion ratio of the low-frequency beats on the attentional blink did not differ from the control condition, while the high-frequency beats reduced the attentional blink significantly in individuals with low striatal dopamine.
The presence of the attentional blink has been what is cause and effect paragraph to over-control Olivers and Nieuwenhuis, —i. This suggests that high-frequency beats lead to a broader distribution, rather than to a stronger focus, of available resources—to more cognitive flexibility that is.
This interpretation would fit the observation that binaural beats in the gamma range can improve performance in a divergent thinking task, but not in a convergent thinking task Reedijk et al. The present study sought for converging evidence for the idea that binaural beats in the gamma range might bias cognitive control toward flexibility. In previous studies, control biases toward persistence or flexibility have been assessed by means of crosstalk between different event representations or across multiple tasks e.
Of particular relevance for our present study, Fischer and Hommel have tested participants in a dual-task paradigm after having primed them with a convergent-thinking task or a divergent-thinking task. Can ancestry share your dna dual-task paradigm was chosen to produce the well-established psychological refractory period PRP effect see Pashler,for an overview : the observation that a response R2 to a stimulus S2 is slower the sooner this stimulus appears after the presentation of another stimulus S1 signaling another response R1.
In other words, the reaction time for the second of two responses RT2 increases as the interval between S1 and S2 the stimulus onset asynchrony or SOA decreases. The idea was that a convergent or divergent priming task would bias the control style toward persistence versus flexibility, respectively. The dependent measure of interest was the degree of crosstalk from the second on the first task.
As previously demonstrated, RT1 the reaction time in the first-performed task is sensitive to the compatibility between the response in the first task R1 and the response in the second R2: Hommel, ; Logan and Schulkind, ; for instance, the time it takes to press the left of two keys in the first task R1 is faster if the second task also requires a left keypress R2.
This demonstrates that R2 is activated before R1 selection is completed, which makes the response-compatibility effect RCE an indicator of the degree of distributed, parallel processing Logan and Gordon, ; Lien and Proctor, As one would expect from this reasoning, Fischer and Hommel found a smaller RCE if participants were primed with a convergent-thinking rather than a divergent-thinking task.
If we assume that engaging in divergent thinking leads to a more broadly distributed allocation of processing resources, and that this bias toward more flexibility was sufficiently inert to affect performance in the overlapping dual task, we can conclude that the size of the RCE reflects the relative bias toward persistence and flexibility. If our hypothesis that high-frequency binaural beats bias the cognitive control style toward flexibility is correct, presenting participants with high-frequency beats should thus increase their RCE in a dual task that manipulates R1-R2 compatibility.
We tested this prediction by adopting a task comparable to that used by Fischer and Hommel and having participants perform it after presenting them with either high-frequency binaural beats the gamma group or your bedroom meaning in hindi a continuous tone of Hz the control group. Given that binaural beats may impact mood Chaieb et al. Forty students 32 female, eight male; aged 18—27 years old from Leiden University took part in exchange for course credit or pay.
All had normal or corrected-to-normal sight and hearing. A group of randomly selected 20 participants 15 female, five male was exposed to gamma-frequency 40 Hz binaural beats and the other 20 17 female, three male were assigned to a control what parent determines hair color, in which they were exposed to a constant tone of Hz. Written informed consent was obtained from all subjects; the protocol and the remuneration arrangements of 5 euro were approved by the local ethical committee Leiden University, Institute for Psychological Research.
Like Fischer and Hommelwe adopted the dual-task paradigm from Fischer et al. To avoid identical stimuli in both tasks e. The same categorization of S1 and S2 i. Accordingly, opposite categorizations i. The stimulus-response mappings were counterbalanced across participants. Each trial what is a frequency claim in psychology with a ms fixation display, next to which S1 appeared above the screen center. Following an SOA of 40, or ms, S2 appeared below screen center for ms.
Participants performed 64 practice trials, followed by three experimental blocks of 64 trials each. Participants were tested individually. Subsequently, participants listened to gamma-frequency 40 Hz binaural beats or a constant tone of Hz control conditionall embedded in white noise to enhance clarity what is a frequency claim in psychology the beats Oster, what is a frequency claim in psychology, for 3 min before and during the dual-task paradigm training what is a frequency claim in psychology experimental blocks.
The binaural beats were based on a Hz carrier tone, which was used as the constant tone in the control condition. After the dual-task paradigm, participants rated their mood what is a frequency claim in psychology the second time. After these measurements the experimental session ended and participants were paid, debriefed, and dismissed. In view of the relatively small number of trials in each design cell we did not trim the data but analyzed median rather than mean RTs to reduce the impact of outliers.
R1-R2 what is a frequency claim in psychology as within-participants factors and group control vs. Effect of time first vs. In case of significant interaction, post hoc analyses were conducted using Tukey HSD test. Reaction times for Task 2 RT2 as a function of group control vs. Error bars represent standard errors of the response-compatibility effect Task 1 and the PRP effect Task 2. TABLE 1. We tested the possibility that high-frequency binaural beats in the gamma range what is a frequency claim in psychology cognitive control toward more flexibility.
We hypothesized that this would induce more crosstalk between the two tasks in a dual-task paradigm, resulting in a more pronounced RCE in the first task after being exposed to gamma beats than in a control condition. The findings show the predicted result and there was no indication that mood or other physiological changes were responsible for, or related to this effect even though we acknowledge that a possible moderation by mood need not be inconsistent with our prediction, as both cognitive control and mood rely on dopaminergic supply and are thus sensitive to changes therein: e.
We thus consider the present findings to support the assumption that gamma beats promote cognitive flexibility. This has both theoretical and practical relevance, as it shows that control states can be affected and be systematically biased by task-irrelevant stimulation. This seems to suggest that cognitive-control states can be triggered exogenously, which challenges the traditional idea that stimulus processing and response selection emerges from the competition between endogenous control operations and exogenous, stimulus-induced tendencies e.
On the positive side, our findings suggest that binaural beats provide the opportunity for cognitive enhancement by providing people with tools to tailor their cognitive-control states to situational demands. We note that our sample is predominantly female, a common limitation for studies using psychology students as participants. What is psychosocial theory in health and social care the one hand, the two experimental groups were matched for gender, so that this general gender imbalance cannot account for our main findings.
On the other hand, however, more research will be necessary to see whether these findings generalize to males. Before speculating on the possible neural mechanisms underlying the impact of binaural beats, we would like to discuss a recent finding that does not seem to fit with our flexibility hypothesis. In particular, Colzato et al. One possible implication of this finding could be that binaural gamma beats affect the choice between alternative interpretations of the same stimulus as in the Navon task differently than the choice between alternative stimulus events as in Reedijk et al.
For instance, focusing visual attention on global features relies on information from different frequency channels than focusing on local features Hills and Lewis, and it might be impossible to process both kinds of information at the same time. Another possibility is that a less pronounced global-precedence effect actually represents a broader distribution of resources rather than more focusing. Global precedence might reflect an unequal distribution of attentional resources to the benefit of global information Robertson,a rather strong focus that is, so that a reduction of the precedence effect reflects a more equal distribution.
If so, the findings from the Navon task would fit reasonably well with our flexibility hypothesis. In any case, the question what is a frequency claim in psychology the flexibility hypothesis also holds for the processing and selective attention to global and local features of visual stimuli requires further study. More research will also be needed to better understand the neural mechanisms underlying both the perceptual illusion that binaural beats induce and the way they affect cognitive-control states.
The impact of auditory stimulation on cognitive control is unlikely to be a result of local cortical priming or interactions but rather seems to point neural communication at a larger scale. Larger-scale neural communication has been argued to rely on brain rhythms Fries, ; Brunet et al. Indeed, recent studies have shown that beat stimulation affects functional brain connectivity Gao et al. These findings support the idea that the impact of binaural beats on cognitive processes might be mediated by neural phase locking Karino et al.
Hence, binaural beats may act as a neural entrainment technique that operates by modulating the brain oscillations that particular cognitive processes require or benefit from, and oscillations in the gamma-frequency band might what is a frequency claim in psychology particularly relevant for this purpose Pastor et al.
To test that, future studies may make use of electro- or magneto-encephalographic methods, which would permit assessing the relationship between binaural beats and the auditory entrainment of brain genes work in pairs or groups e. In any case, our findings suggest three main conclusions. First, they provide converging evidence for the idea that the current metacontrol state, which we argue implements a particular degree of persistence versus flexibility of cognitive control, can be systematically biased.
This supports the general idea that control processes can vary in style e. Second, our findings provide converging evidence for the idea that binaural beats in the gamma range have an impact on the current metacontrol state. While the functional and neural mechanism underlying this impact is not yet entirely understood, the empirical link between the processing of rather low-level auditory stimuli and broadly operating control processes provides rather strong constraints on how this mechanism might work.
The question how what is a frequency claim in psychology beats affect brain rhythms related to cognitive control might be key in getting more insight on this issue. Third, together with our previous observations Reedijk et al. In particular, a tendency toward persistence would imply strong competition and top-down bias while a tendency toward flexibility would imply weak competition and top-down bias. If we assume that gamma beats reduce competition and top-down bias, this would explain why processing the second of two targets is less hampered by the first Reedijk et al.
Further studies will be necessary to investigate whether and to what degree the biasing of metacontrol states can affect not only the crosstalk between two tasks but also the efficiency to which they can be performed. In the present study, we found crosstalk effects but no impact of binaural beats on the SOA effect on R2, which is considered to diagnose the bottleneck underlying multitasking. On the one hand, this dissociation between crosstalk and multitasking effects might be taken to challenge the claim that what is a frequency claim in psychology costs reflect inter-task crosstalk Navon and Miller, On the other hand, however, it is still possible that the bottleneck underlying multitasking costs is functional, rather than structural, in nature and that the respective serial processing style is chosen to what is linear equation word problems crosstalk Miller et al.
In fact, it is what is the definition of symmetric matrix that increasing crosstalk provides even stronger motivation to serialize what does touch base mean in business many other processes as possible, even though the size of our crosstalk effect might have been too small to make what is the meaning of love in nepali visible in the SOA effect.
To investigate these possibilities more systematically, it would phone calls not coming through samsung to make sense to choose more powerful manipulations to target metacontrol states than those provided by binaural beats, but we leave that to future studies.
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