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Brief Communications

Goal-Congruent Default Network Activity Facilitates Cognitive Control

R. Nathan Spreng, Elizabeth DuPre, Dhawal Selarka, Juliana Garcia, Stefan Gojkovic, Judith Mildner, Wen-Ming Luh and Gary R. Turner
Journal of Neuroscience 15 October 2014, 34 (42) 14108-14114; DOI: https://doi.org/10.1523/JNEUROSCI.2815-14.2014
R. Nathan Spreng
1Laboratory of Brain and Cognition, Department of Human Development,
2Human Neuroscience Institute, and
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Elizabeth DuPre
1Laboratory of Brain and Cognition, Department of Human Development,
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Dhawal Selarka
4Department of Psychology, York University, Toronto, Ontario, M3J1P3, Canada
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Juliana Garcia
1Laboratory of Brain and Cognition, Department of Human Development,
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Stefan Gojkovic
4Department of Psychology, York University, Toronto, Ontario, M3J1P3, Canada
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Judith Mildner
1Laboratory of Brain and Cognition, Department of Human Development,
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Wen-Ming Luh
3Cornell MRI Facility, Cornell University, Ithaca, New York 14853, and
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Gary R. Turner
4Department of Psychology, York University, Toronto, Ontario, M3J1P3, Canada
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Abstract

Substantial neuroimaging evidence suggests that spontaneous engagement of the default network impairs performance on tasks requiring executive control. We investigated whether this impairment depends on the congruence between executive control demands and internal mentation. We hypothesized that activation of the default network might enhance performance on an executive control task if control processes engage long-term memory representations that are supported by the default network. Using fMRI, we scanned 36 healthy young adult humans on a novel two-back task requiring working memory for famous and anonymous faces. In this task, participants (1) matched anonymous faces interleaved with anonymous face, (2) matched anonymous faces interleaved with a famous face, or (3) matched a famous faces interleaved with an anonymous face. As predicted, we observed a facilitation effect when matching famous faces, compared with anonymous faces. We also observed greater activation of the default network during these famous face-matching trials. The results suggest that activation of the default network can contribute to task performance during an externally directed executive control task. Our findings provide evidence that successful activation of the default network in a contextually relevant manner facilitates goal-directed cognition.

  • cognitive control
  • default mode network
  • fMRI
  • long-term memory
  • n-back
  • working memory

Introduction

The default network is typically deactivated by tasks that require attention and cognitive control. Transient increases in default network activity predict performance errors (Weissman et al., 2006) and off-task behavior, such as mind-wandering (Mason et al., 2007; Christoff et al., 2009). Tasks that deactivate the default network typically use stimuli that minimally engage internal mnemonic representations or are devoid of personal significance (shapes, letters). In contrast, engagement of the default network is elicited by tasks that are self-referential, social, or access long-term memory representations (Andrews-Hanna et al., 2014). In these processes, action is often decoupled from perception and relies upon online representations rather than external stimuli (Smallwood et al., 2013a). Coactivation and coupling of default and executive regions is observed when goal-directed cognition is internally directed (Spreng et al., 2010). In most cognitive control studies, however, engagement of the default network is incongruent with task goals. It is unknown how the default network is modulated when cognitive control processes interact with long-term memory representations during an externally oriented goal-directed task.

We developed a novel working memory task, the “famous faces n-back,” to transiently evoke default network activity in the context of a sustained cognitive control challenge. Famous faces were used to activate long-term memory representations and engage the default network, consistent with prior observations that viewing famous or familiar faces activates posterior cingulate cortex (PCC), medial prefrontal cortex (MPFC), and medial and lateral temporal lobes (Leveroni et al., 2000). In our two-back task, images of famous faces were embedded within sequences of anonymous face stimuli. Three conditions of interest comprised a three face stimuli series, or triplet. In the first, participants viewed three anonymous faces, with an anonymous face-match decision (AAA condition). In the second, a famous face was embedded between two anonymous faces, with an anonymous face-match decision (AFA condition). In the third triplet, an anonymous face was embedded between two famous faces, with a famous face-match decision (FAF condition). Holding working memory demands constant enabled us to directly examine the impact of familiarity (famous face identities) on performance, while investigating the impact of default network engagement in the context of an externally directed cognitive control task. In other words, we directly assessed the impact of the default network on behavior that is mediated by mnemonic representations.

We predicted better performance for the famous face relative to the anonymous face-match conditions, consistent with previous behavioral work (Jackson and Raymond, 2008). We predicted that this on-task behavioral facilitation would be accompanied by higher default network activity, providing critical evidence that task-relevant default network activation can facilitate cognitive control performance during an externally oriented task. Additional evidence comes from studies of resting-state functional connectivity, where individual differences in default network connectivity predicted externally directed information processing reliant on mnemonic representations (Baird et al., 2013; Smallwood et al., 2013b). Our predictions suggest that the impact of default network activation on cognitive control is dependent on whether access to stored representational knowledge is congruent with task goals, thereby influencing current actions.

Materials and Methods

Participants were 36 healthy young adults (mean age = 22.3 years, SD = 3.8, 17 males and 19 females) with normal or corrected-to-normal visual acuity, and no history of psychiatric, neurological, or other medical illness that could compromise cognitive functions. All participants gave informed consent in accordance with the Institutional Review Board at Cornell University.

Faces two-back task.

Stimuli consisting of famous and anonymous face images (Fig. 1) were presented serially and participants were asked to decide, for each face, whether it matched the face presented two images before (Fig. 1). Responses were made on a button box placed in the participant's right hand. Two blocks of 48 face images (famous to anonymous ratio ∼1:3) were presented during each run. Conditions of interest were the AAA, AFA, and FAF trial triplets, all of which were nonoverlapping and interleaved by anonymous faces. Faces were presented for 500 ms, followed by 2000 ms fixation. Task blocks were preceded and followed by 30 s of fixation.

MRI data collection, preprocessing, and analysis.

Brain imaging data were acquired with a 3T GE Discovery MR750 MRI scanner with a 32-channel receive-only phased-array head coil at the Cornell Magnetic Resonance Imaging Facility, in Ithaca. Anatomical scans were acquired using a T1-weighted volumetric MRI magnetization prepared rapid gradient echo (TR = 7.7 ms; TE = 3.4 ms; 7° flip angle; 1.0 mm isotropic voxels, 176 slices). Five 5 m 30 s experimental runs of blood–oxygen level-dependent (BOLD) functional scans were acquired with a T2*-weighted echo-planar imaging pulse sequence (TR = 2500 ms; TE = 25 ms; 80° flip angle; 49 axial slices; 3.0 mm isotropic voxels). Anatomical and functional scans were acquired with 2× acceleration with sensitivity encoding.

All fMRI data were preprocessed using SPM8. The first four volumes in each run were excluded from analyses to allow for T1-equilibration effects. Data were corrected for slice-dependent time shifts and for head motion within and across runs using a rigid body correction. Movement was plotted and visually inspected using ArtRepair (Mazaika et al., 2009); for four subjects, frames with movement >0.5 mm/TR were motion scrubbed, not exceeding 20% of data for any run. Images were then spatially normalized to the standard space of the Montreal Neurological Institute atlas and smoothed with a 6 mm full-width at half-maximum Gaussian kernel, yielding a volumetric time series resampled at 2 mm3 voxels.

The preprocessed neuroimages were analyzed with partial least squares (PLS; Krishnan et al., 2011). PLS is a data-driven multivariate statistical technique that reveals activity across the entire brain that correlates with study design. With this method, the hemodynamic response is not explicitly modeled. For the novel famous face analysis, the first instance of each famous face was examined as an event with a four-lag interval (10 s) to estimate the full hemodynamic response. For the working memory analyses, condition-wise triplets (AAA, AFA, FAF) were examined as trial blocks with a 15 s duration to account for the hemodynamic delay. Within PLS, the covariance between the design and all other brain voxels is decomposed into latent variables (LVs) that can identify multiple patterns of activity. The results provide a set of brain regions wherein activity is reliably related to the task conditions for each LV. Each brain voxel is given a singular value weight, known as a salience, which is proportional to the covariance of activity with the task contrast on each LV. Multiplying the salience by the BOLD signal value in that voxel and summing the product across all voxels gives a composite brain activity score for each participant on a given LV. These scores can be used to examine similarities and differences in brain activity across conditions, as greater activity in brain areas with positive (or negative) weights on an LV will yield positive (or negative) mean scores for a given condition. Confidence intervals (95%) for the mean composite brain activity score in each condition were calculated from the bootstrap, and differences in activity between conditions were determined via a lack of overlap in these confidence intervals. The decomposition and associated resampling techniques consider all voxels simultaneously, thus avoiding the problem of multiple statistical comparisons. Because of its ability to identify voxels with covarying activity, this technique is methodologically suited to the investigation of large-scale brain networks. Significance of the LVs was determined by 500 permutation tests, using resampling without replacement. Robustness of each voxel's contribution to a LV was provided by bootstrapping that resampled the data 100 times, with replacement, to estimate the SE of the salience of each voxel on the LV. A bootstrap ratio (BSR), calculated as the ratio of each salience to its SE, was thresholded at ±2.58, equivalent to p < 0.01.

Results

Behavior

Task performance on the AAA, AFA, and FAF conditions, measured as accuracy and reaction time (RT), are depicted in Figure 1. We confirmed that accuracy was below ceiling for all three conditions with a simple t test criterion set to 100% (all t values <−6.3, all p values <0.001). As predicted, participants performed better when matching famous faces (FAF), compared with matching anonymous faces (AAA, AFA). A priori planned comparisons with paired samples t tests revealed greater accuracy for FAF compared with AAA (t(35) = 5.3, p < 0.001) and AFA (t(35) = 6.5, p < 0.001); and faster RT for correct FAF trials compared with correct AAA (t(35) = 2.1, p < 05) and correct AFA trials (t(35) = 2.3, p < 0.05). No differences were observed in performance when matching anonymous faces for accuracy (t(35) = −0.3, p = 0.78) or RT (t(35) = 0.3, p = 0.77). In all cases, two-tailed p values are reported.

Figure 1.
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Figure 1.

Faces n-back task structure and performance. A, The faces two-back consisted of a stream of stimuli including famous and anonymous faces. Three triplet conditions were embedded within the task: AAA, AFA, and FAF. In the bottom, performance for the AAA, AFA, and FAF triplet matching for (B) accuracy, and (C) RT for correct trials.

Neuroimaging

First, we examined sustained faces n-back task performance relative to fixation. A significant pattern of activity dissociated the task from the fixation baseline (p = 0.002; Fig. 2A; Table 1). Sustained task performance over the block was associated with increased BOLD signal in bilateral, lateral prefrontal and parietal brain regions, anterior insula, dorsal anterior cingulate, and the lateral fusiform gyrus. Conversely, fixation was associated with many regions of the default network, including MPFC, PCC, inferior parietal lobule, medial temporal lobes, and posterior insula.

Figure 2.
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Figure 2.

Sustained and transient brain activity during the faces n-back task. A, Sustained block activity for the faces n-back task (warm colors) and fixation (cool colors). B, Transient activity during the first instance of viewing a famous (warm colors) versus anonymous (cool colors) face. C, Transient activity during the triplets for famous face matching (warm colors) and anonymous face matching (cool colors) conditions.

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Table 1.

Peak activation coordinates

We next examined the pattern of neural activity associated with perceiving a famous face for the first time (in the experimental session), relative to seeing an anonymous face for the first time. A significant pattern of activity dissociated these trials (p = 0.002; Fig. 2B; Table 2). Transient increases in activity while viewing the first instance of a famous face were observed in MPFC, PCC, anterior temporal lobes, hippocampus, anterior insula, ventral temporal lobe, and left prefrontal cortex. In contrast, viewing an anonymous face for the first time showed relatively more activity in the extended frontoparietal control network (Vincent et al., 2008; Spreng et al., 2010), including middle frontal gyrus and rostrolateral prefrontal cortex, the anterior extent of the inferior parietal lobule, inferior lateral temporal cortex, and occipital cortex.

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Table 2.

Peak activation coordinates

We then examined brain activity during the face triplets for the AAA, AFA, and FAF conditions. Only correct trials were included in this analysis. In this data-driven analysis, we found that the FAF condition dissociated from the AAA and AFA conditions, which covaried together (p < 0.02; Fig. 2C; Table 3). Matching famous faces engaged MPFC, PCC, hippocampus, anterior temporal lobe, and parahippocampal cortex. Matching anonymous faces, in contrast, engaged dorsal anterior cingulate, rostrolateral prefrontal cortex, middle frontal gyrus, insula, supramarginal gyrus, right temporoparietal junction, and other regions.

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Table 3.

Peak activation coordinates

In a final control analysis, we used a median split of RT to divide the AAA, AFA, and FAF triplet conditions. Again, only accurate trials were included. This analysis was conducted to demonstrate that greater default network engagement during FAF was not an artifact of the faster RT on these trials. If trial-wise release from task were to account for the default network activity, than we would expect greater default network activity for the faster AAA and AFA conditions than the slower FAF, which were significantly different (t(35) = −15.0, p < 0.001; t(35) = −17.5, p < 0.001, respectively). Additionally, we would not expect to see differences in default network activity for the RT-matched slow AAA, AFA, and FAF conditions, which were not significantly different from each other (F(2,34) = 0.13, p = 0.88). We found that RT did not explain differences in default network activity. Once again, FAF was dissociated from AAA and AFA, with high and low RT conditions covarying together. Both high and low RT conditions for the famous face-match trials engaged default network brain regions (p < 0.05; Fig. 3), consistent with the prior triplet analysis.

Figure 3.
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Figure 3.

Matching anonymous and famous faces. A, Composite brain activity scores for the anonymous face-matching triplets (AAA/AFA) and famous face-matching triplets (FAF; see Fig. 2C for corresponding brain activity map). B, Composite brain activity scores in the median RT split analysis of the anonymous and famous face-matching triplets. For both (A) and (B), anonymous face-matching conditions covary together and are dissociated from famous face-matching conditions. No differences were observed within condition by RT. Confidence intervals calculated from the bootstrap resampling. C, Brain activity for the median RT split analysis during the triplets for famous face-matching (warm colors) and anonymous face-matching (cool colors) conditions.

Discussion

We developed a novel faces n-back working memory task to investigate whether goal-congruent activation of the default network was associated with better performance on an executive control task. Transient default network activity has been associated with off-task behaviors, such as mind wandering and linked to reduced cognitive control performance (Weissman et al., 2006; Mason et al., 2007; Christoff et al., 2009). This is perhaps not surprising as mind-wandering is typically characterized by focusing on internal representations of oneself, other people, or remembering or imagining personal events (Smallwood, 2013), thereby drawing attentional resources away from external, task-relevant stimuli (Baird et al., 2014). Prior studies of cognitive control typically use stimuli that do not activate long-term memory or are devoid of personal significance. Few studies have examined default network activity when access to internal representations is relevant to task performance. Here we embedded trials known to engage the default network, viewing famous faces (Leveroni et al., 2000; Eger et al., 2005; Ross and Olson, 2012), within a continuous working memory paradigm known to activate brain regions implicated in cognitive control (Owen et al., 2005). Our aim was to test whether transient increases in default network activity would facilitate working memory performance when access to internal mental representations is congruent with task goals.

Behaviorally, n-back task performance was better for famous than anonymous face-match triplets. This is consistent with evidence that visual working memory is enhanced for stimuli with robust long-term memory representations (Jackson and Raymond, 2008). To investigate interactions between default network activity and control processing at the level of the brain, we first conducted confirmatory analyses to evaluate the main effects of our primary task manipulations for, (1) sustained working memory activity, and, (2) viewing famous faces. Sustained n-back task performance demonstrated bilateral increases in intraparietal sulcus, the putative frontal eye fields, ventral precentral sulcus, lateral prefrontal regions, dorsal anterior cingulate, and anterior insula, compared with fixation, consistent with previous neuroimaging studies of nonverbal n-back performance (Fig. 2A; Owen et al., 2005). Additional activity was observed in ventral visual association cortices corresponding to the putative fusiform face area. To examine transient activity associated with viewing famous faces, we contrasted activity when participants viewed the first instances of famous and anonymous faces. Significant increases were observed within MPFC, PCC, lateral and medial temporal lobes, and the left inferior frontal gyrus for famous compared with anonymous face viewing, consistent with previous findings (Fig. 2B; Leveroni et al., 2000; Natu and O'Toole, 2011). In contrast, viewing anonymous faces revealed greater activity in the frontoparietal control network (Vincent et al., 2008; Spreng et al., 2010), including the middle frontal gyrus and anterior extent of the inferior parietal lobule (Fig. 2B). This increased activation in frontoparietal control regions raises the possibility that working memory for anonymous faces requires greater top-down control processes than famous face matching, where performance is supported by bottom-up access to long-term memory representations.

Finally, we examined patterns of brain activity that distinguished the famous and anonymous face-match conditions. Significantly greater default network activity was observed for the famous face-match triplet. This observation is consistent with our prediction that greater activity in the default network would correspond with better executive control performance. These results directly contradict the prevailing “task-negative” network view (for review, see Spreng, 2012), which suggests that recruitment of the default network during controlled processing is associated with off-task behaviors, poor task performance, and is a putative biomarker of cognitive dysfunction and brain disease (Anticevic et al., 2012; Whitfield-Gabrieli and Ford, 2012; Andrews-Hanna et al., 2014). An alternate explanation might be that the famous face-match triplet condition is easier and thereby engages the default network to a greater degree. From this perspective, faster RTs may have provided greater trial-wise opportunities to engage in off-task behaviors, consistent with the task-negative view of default network activation. Conceptually, this is an unlikely explanation because the n-back paradigm is a continuous performance task and provides no release from controlled processing demands regardless of trial-wise RTs. Empirically, RT did not emerge as a significant factor in the median split RT analysis (Fig. 3) where high- and low-RT famous face-match trials covary together and engage the default network. Familiarity enhances working memory under conditions where stored personal semantic information can be accessed to support online maintenance (Gobbini and Haxby, 2007; Jackson and Raymond, 2008). This behavioral facilitation effect aligns with neuroimaging evidence that viewing familiar relative to unfamiliar faces activates regions of the default network (Leveroni et al., 2000; Shah et al., 2001; Eger et al., 2005; Ross and Olson, 2012). This activity is consistent with a role for the default network in mnemonic, social, and self-referential processing (Andrews-Hanna et al., 2014). To reconcile the task-negative view with the current findings, we argue that increased default network activation can support cognitive control, but only when access to stored mnemonic representations is congruent with the specific demands of the task. Otherwise, activation of the default network, which may signal off-task behaviors, such as mind wandering, would detract from controlled processing.

These findings demonstrate that goal-congruent default network activation facilitates task performance during continuous executive control demand where mnemonic processes may guide behavior. Smallwood et al. (2013a) demonstrated that the default network can be active under situations where external processing is compromised, or when mnemonic processing was facilitative, depending upon whether perception or memory were aligned with the goals of the task. Supporting the action–perception decoupling hypothesis, default network engagement is associated with better performance on tasks that do not require access to immediate perceptual information (Smallwood, 2013; Smallwood et al., 2013a). We extend this model, demonstrating that access to long-term memory representations, over and above working memory per se, engages the default network in the service of externally directed cognitive control.

There is growing evidence of dynamic functional coupling between default and cognitive control brain regions as task demands alternate between externally and internally directed attention as well as during the transition from rest to task performance (Spreng et al., 2010; Bluhm et al., 2011; Spreng and Schacter, 2012; Cocchi et al., 2013; Cole et al., 2013). Here we extend our understanding of the role of the default network in cognitive control by demonstrating that transient increases in activation, not only coupling, can facilitate controlled processing, when access to internal mental representations is congruent with the goals of the task. This model supports the hypothesis that internally and externally directed cognitive processes interact in a facilitative manner to support goal-directed cognition (Dixon et al., 2014).

The famous faces n-back task does not explicitly cue retrieval, relying instead on spontaneous or incidental activation of internal mental representations (Todorov et al., 2007). It is unclear whether context-relevant activation of default brain regions during cognitive control may occur without conscious awareness or whether active, intentional retrieval is necessary. A study of transitive reasoning found increased connectivity between default and frontoparietal control regions, but only when participants consciously activated a previously learned sequence structure (Rogers et al., 2010). Similarly, during a social working memory task, internal representations were explicitly cued (i.e., knowledge of a friend's personality traits) and increased executive and default network activation was also reported (Meyer et al., 2012). In a recent review, intentionality was also identified as a critical factor guiding interactions between internally and externally directed cognitive processes (Dixon et al., 2014). Our data suggest that automatic retrieval of stored representations may be sufficient to show default engagement during cognitive control tasks. Further study of intentional versus spontaneous engagement of default network regions in the service of goal-directed cognition is an important area of future research.

These findings provide a more comprehensive account of default and cognitive control interactions. Recruitment of default network regions during controlled processing is dependent on the congruence between external task goals and activation of internal mental representations. Many cognitive control paradigms include stimuli (e.g., shapes, spatial locations, and letters) that minimally engage stored mnemonic representations; indeed, these have previously been viewed as confounds. On these tasks, access to, or activation of, internal representational knowledge is task-irrelevant and detrimental to ongoing cognitive control. Goal-pursuit in the real world rarely involves processing novel information or stimuli devoid of personal meaning. Outside of the laboratory, humans pursue goals by continuously accessing stored representational knowledge about past experiences, current motivations, future plans, and the social milieu. Here we argue that contextually relevant engagement of default-network brain regions is a critical mechanism facilitating this ongoing dialogue between pursuit of external goals and internal representations.

Footnotes

  • This work was supported in part by NIH Grant 1S10RR025145 and an NSERC Discovery Grant to GRT. We thank Dale Stevens and Karen Spreng for comments on the paper, and Kyle Kurkela for assistance with data analysis.

  • The authors declare no competing financial interests.

  • Correspondence should be addressed to Dr R. Nathan Spreng, Laboratory of Brain and Cognition, Department of Human Development, Cornell University, Ithaca, NY 14853. nathan.spreng{at}gmail.com

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The Journal of Neuroscience: 34 (42)
Journal of Neuroscience
Vol. 34, Issue 42
15 Oct 2014
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Goal-Congruent Default Network Activity Facilitates Cognitive Control
R. Nathan Spreng, Elizabeth DuPre, Dhawal Selarka, Juliana Garcia, Stefan Gojkovic, Judith Mildner, Wen-Ming Luh, Gary R. Turner
Journal of Neuroscience 15 October 2014, 34 (42) 14108-14114; DOI: 10.1523/JNEUROSCI.2815-14.2014

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Goal-Congruent Default Network Activity Facilitates Cognitive Control
R. Nathan Spreng, Elizabeth DuPre, Dhawal Selarka, Juliana Garcia, Stefan Gojkovic, Judith Mildner, Wen-Ming Luh, Gary R. Turner
Journal of Neuroscience 15 October 2014, 34 (42) 14108-14114; DOI: 10.1523/JNEUROSCI.2815-14.2014
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Keywords

  • cognitive control
  • default mode network
  • fMRI
  • long-term memory
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