Abstract: Suppressing retrieval of unwanted memories reduces their later conscious recall. It is widely believed, however, that suppressed memories can continue to exert strong unconscious effects that may compromise mental health. Here we show that excluding memories from awareness not only modulates medial temporal lobe regions involved in explicit retention, but also neocortical areas underlying unconscious expressions of memory. Using repetition priming in visual perception as a model task, we found that excluding memories of visual objects from consciousness reduced their later indirect influence on perception, literally making the content of suppressed memories harder for participants to see. Critically, effective connectivity and pattern similarity analysis revealed that suppression mechanisms mediated by the right middle frontal gyrus reduced activity in neocortical areas involved in perceiving objects and targeted the neural populations most activated by reminders. The degree of inhibitory modulation of the visual cortex while people were suppressing visual memories predicted, in a later perception test, the disruption in the neural markers of sensory memory. These findings suggest a neurobiological model of how motivated forgetting affects the unconscious expression of memory that may be generalized to other types of memory content. More generally, they suggest that the century-old assumption that suppression leaves unconscious memories intact should be reconsidered.

Abstract: Motivated forgetting is a psychological defense mechanism whereby people cope with threatening and unwanted memories by suppressing them from consciousness. A series of laboratory experiments investigate whether social identity threat can motivate people subsequently to forget identity-linked marketing promotions. To this effect, whereas social identity priming improves memory for identity-linked promotions, priming coupled with social identity threat (i.e., negative identity-related feedback) impairs memory. Importantly, this identity threat effect occurs only among people who identify strongly with their in-group and only for explicit memory. Implicit memory, in contrast, remains intact under threat. Additionally, the identity threat effect is eliminated (i.e., explicit memory is restored) if people affirm the threatened social identity, thereby mitigating the threat, prior to memory retrieval. Finally, the identity threat effect occurs only when automatic processes guide forgetting. When forgetting is guided by deliberate and controlled processes, the to-be-forgotten memories intrude into consciousness.

Abstract: In the present study, we examined whether note-taking as a memory aid may provide a naturalistic example of intentional forgetting. In the first experiment, participants played Concentration, a memory card game in which the identity and location of pairs of cards need to be remembered. Before the game started, half of the participants were allowed to study the cards, and the other half made notes that were then unexpectedly taken away. No significant differences emerged between the two groups for remembering identity information, but the study group remembered significantly more location information than did the note-taking group. In a second experiment, we examined whether note-takers would show signs of proactive interference while playing Concentration repeatedly. The results indicated that they did not. The findings suggest that participants adopted an intentional-forgetting strategy when using notes to store certain types of information.

Abstract: Proactive interference (PI) occurs when previously learned information interferes with new learning. In a working memory task, PI induces longer response times and more errors to recent negative probes than to new probes, presumably because the recent probe's familiarity invites a "yes" response. Warnings, longer intertrial intervals, and the increased contextual salience of the probes can reduce but not eliminate PI, suggesting that cognitive control over PI is limited. Here we tested whether control exerted in the form of intentional forgetting performed during working memory can reduce the magnitude of PI. In two experiments, participants performed a working memory task with directed-forgetting instructions and the occasional presentation of recent probes. Surprise long-term memory testing indicated better memory for to-be-remembered than for to-be-forgotten items, documenting the classic directed-forgetting effect. Critically, in working memory, PI was virtually eliminated for recent probes from prior to-be-forgotten lists, as compared to recent probes from prior to-be-remembered lists. Thus cognitive control, when executed via directed forgetting, can reduce the adverse and otherwise persistent interference from familiarity, an effect that we attribute to attenuated memory representations of the to-be-forgotten items.

Abstract: Consistent with their emphasis on emotional goals, older adults often exhibit a positivity bias in attention and memory relative to their young counterparts (i.e., a positivity effect). The current study sought to determine how this age-related positivity effect would impact intentional forgetting of emotional words, a process critical to efficient operation of memory. Using an item-based directed forgetting task, 36 young and 36 older adults studied a series of arousal-equivalent words that varied in valence (i.e., positive, negative, and neutral). Each word was followed by a cue to either remember or forget the word. A subsequent “tagging” recognition task required classification of items as to-be-remembered (TBR), to-be-forgotten (TBF), or new as a measure of directed forgetting and source attribution in participants’ memory. Valence did not affect intentional forgetting in both young and older age groups. A goal-consistent valence effect did, however, emerge in older adults’ source attribution performance. Specifically, older adults assigned more TBR-cues to positive words and more TBF-cues to negative words. Results are discussed in light of existing literature on emotion and directed forgetting as well as the socioemotional selectivity theory underlying the age-related positivity effect.

Abstract: Aging is thought to involve a decline in executive-control capacities, although evidence regarding this claim is not always clear. Thus, although studies exist that suggest impoverished inhibitory memory control in older adults relative to younger adults, experiments with the list-method direct forgetting procedure have mostly failed to show adult-age differences in voluntary forgetting. In the present study we aimed to further study this issue by comparing young-old and young adults' performance with the selective directed forgetting (SDF) procedure, which we assumed to involve higher demands of executive control than the standard nonselective procedure. Thus, on the basis of previous studies showing that a critical factor in finding adult-age differences in executive-control tasks is the overall challenge posed by the tasks, we predicted less SDF in older adults than in younger adults. Supporting our hypothesis, across three experiments we show evidence of older adults' impoverished capacity to voluntarily forget episodic memories, although only when the task requires selective forgetting. Ours join other findings to suggest that sensitiveness to detect adult-age differences in cognitive control may strongly depend on the executive-control demands imposed by tasks.

Abstract: Rehearsal strategies of adults with autism spectrum disorders (ASDs) and demographically matched typically developed (TD) adults were strategically manipulated by cueing participants to either learn, or forget each list word prior to a recognition task. Participants were also asked to distinguish between autonoetic and noetic states of awareness using the Remember/Know paradigm. The ASD group recognised a similar number of to-be-forgotten words as the TD group, but significantly fewer to-be-learned words. This deficit was only evident in Remember responses that reflect autonoetic awareness, or episodic memory, and not Know responses. These findings support the elaborative encoding deficit hypothesis and provide a link between the previously established mild episodic memory impairments in adults with high functioning autism and the encoding strategies employed.

Abstract: This study aimed to investigate attentional and memory biases in alcohol-dependents with and without major depression compared to healthy controls. We assumed that both groups of alcohol-dependents would show attentional and memory biases for alcohol-related words. For the alcohol-dependents with depression, we additionally expected both types of biases for negative words. Alcohol-dependents without co-morbidity (Alc) and alcohol-dependents with major depression (D-Alc) as well as control participants with a moderate consumption of alcohol (Con) completed an alcohol Stroop task and a directed forgetting paradigm using word stimuli from three categories: neutral, negative, and alcohol-related. Stroop effects showed that not only alcohol-dependents but also control participants were more distracted by alcohol-related than by negative words. In the directed forgetting procedure, all participants showed a significant effect for each word-category, including alcohol-related and negative words. The D-Alc-group memorized more alcohol-related than negative to-be-remembered words. The results do not corroborate the hypothesis of more pronounced attentional and memory biases in alcohol-dependents. However, in alcohol-dependents with depression a memory bias for alcohol-related material was found, suggesting that this group may be more pre-occupied with alcohol than patients without such co-morbidity.

Abstract: Most daily routines are determined by habits. However, the experienced ease and automaticity of habit formation and execution come at a cost when habits that are no longer appropriate must be overcome. So far, proactive and reactive control strategies that prevent inappropriate habit execution either by preparation or “on the fly” have been identified. Here, we present evidence for a third, retroactive control strategy. In two experiments using the list method of directed forgetting, the accessibility of newly learned and practiced stimulus-response rules was significantly reduced when participants were cued to forget the rules rather than to remember them. The results thus show that directed forgetting, so far observed and investigated only for episodic memory traces, can also be applied to habits. The findings further emphasize the adaptive value of forgetting and can be taken as evidence of a retroactive strategy of habit control.

Abstract: The attempt to forget some recently encoded information renders this information difficult to recall in a subsequent memory test. "Forget" instructions are only effective when followed by learning of new material. In the present study, we asked whether the new material needs to match the format of the to-be-forgotten information for forgetting effects to emerge. Participants studied visually presented words or line drawings (L1) and afterward were instructed to remember or forget these items. Then a 2nd conceptually unrelated list (L2) was presented that either matched or mismatched the format of L1. Forgetting effects were observed only when the lists matched in format but not when the formats mismatched. This result establishes an important boundary condition of directed forgetting and suggests that when salient retrieval cues guide retrieval, they eliminate the effect of the "forget" cue. Implications for theories of directed forgetting are discussed.

Abstract: The neurocognitive basis of memory retrieval is often examined by investigating brain potential old/new effects, which are differences in brain activity between successfully remembered repeated stimuli and correctly rejected new stimuli in a recognition test. In this study, we combined analyses of old/new effects for words with an item-method directed-forgetting manipulation in order to isolate differences between the retrieval processes elicited by words that participants were initially instructed to commit to memory and those that participants were initially instructed to forget. We compared old/new effects elicited by to-be-forgotten (TBF) words with those elicited by to-be-remembered (TBR) words in both an explicit-memory test (a recognition test) and an implicit-memory test (a lexical-decision test). Behavioral results showed clear directed forgetting effects in the recognition test, but not in the lexical decision test. Mirroring the behavioral findings, analyses of brain potentials showed evidence of directed forgetting only in the recognition test. In this test, potentials from 450–650 ms (P600 old/new effects) were more positive for TBR relative to TBF words. By contrast, P600 effects evident during the lexical-decision test did not differ in magnitude between TBR and TBF items. When taken in the context of prior studies that have linked similar parietal old/new effects to the recollection of episodic information, these data suggest that directed-forgetting effects manifest primarily in greater episodic retrieval by TBR than TBF items, and that retrieval intention may be important for these directed-forgetting effects to occur.

Abstract: M=3.38 (%26) M=0.77 (%5.9) M=2.16 (%16.6) M=0.8 (%6) SD= 1.79 SD= SD=1.6 SD=0.93 Concrete M=2.58 (%19.8) M=1.13 (%8.7) M=1.54 (%11.85) M=1.22 (%9.38) SD=1.62 SD=0.88 SD=1.43 SD=1.17 HOW DO OLDER AND YOUNGER ADULTS DIFFER IN DIRECTED FORGETTING? TURKISH JOURNAL OF GERIATRICS 2014; 17(3) 294 (F(1,94)=72.58, p<.001, η2 = 0.44); F(1,94)= 10.49, p<.01, η2= 0.1). The main effect of level of concreteness was not significant (F(1,94) = 2.58, p>.001, η2 =0.03). The interaction between age and concreteness level, (F(1,94) = 28.3, p <.001, η2 =0.23) and the interaction between age and instruction type on recall scores, (F(1,94)=12.71, p< .01, η2=0.12) were found to be significant. In addition, the interaction between age, level of concreteness and instruction type was significant (F(2.38, 223.63)= 13.56, p<.001, η2=0.13) (Figure 1). In addition, whereas any significant difference between total scores of R and F in older subjects, =0.11, sd=0.34, p>.001 was not observed, a significant difference was found in younger participants, =2.26, sd=0.56, p<.001.

Abstract: Intentional forgetting of emotional memories refers to the phenomenon that people attempt to actively put the unwanted memories out of awareness. The item method directed forgetting is often used to explore the intentional forgetting of emotional memory. Most of the directed forgetting studies suggest that both the selective encoding and retrieval inhibitory contribute to the directed forgetting effect. Though the emotional material can enhance the memory, people can use the inhibitory mechanism to forget the emotional memory. Self-reference effect is an important effect of memory. It seems that the self is a well-developed construct that promotes both elaboration and organization of encoded information. Although forgetting is an important process of memory, most studies concentrated on the encoding of the memory when it comes to the self reference effect. As we know, few studies focused on whether self-reference can influence the directed forgetting. Most studies suggest that people can intentionally forget the emotional memories. If these materials are enhanced by emotion and self-reference, can people forget them? As the best knowledge of us, no study concentrated on this problem up to now. But this problem is common in our daily life.Thirty eight undergraduates or master students participated in the Experiment 1. Two hundred and forty four trait adjective words were included in the materials which were randomly distributed to two lists(one is the study list and the other is the distracter in the recognition test). The experiment was divided into three separate parts. In the study period, participants should finish two tasks. Firstly, subjects were first asked to judge whether the adjective was proper to describe the self or luxun, and then they were instructed to remember or forget the front word. After carrying out a distraction task, there was a recognition task in which participants should discriminate whether the word was old or new. The same experimental procedure was applied in the experiment 2. The difference was that a recalling test replaced the recognition after the distraction task. A three-factor analysis of variance(ANONA) was performed after the experiment with the valence of the materials, the type of the reference and the type of the memory instruction as within-subjects variables. The results of experiment 1 showed that there was a main effect of memory instruction. However, the main effect of the type of the reference and the interaction effect of the valence, the type of the reference and the memory instruction were not significant. However, the results of the experiment 2 showed an interaction within the valence, the type of the memory instruction and the type of the reference. This discussion focused on the self-enhancement effect. The results suggest that self-reference can influence the directed forgetting of the emotional memory. Self-reference can enhance the discrimination of the materials. Then, participants can fully use the inhibition mechanism to inhibit the TBF items and more cognitive resources can be used to encode the TBR items. The results also suggest self-reference produce different influences on different emotional memories and the self-enhancement motivation play an important role in these influences. In order to have a positive self-image, participants try to forget the negative self-reference items, and keep the positive self-reference items.

Abstract: While sleep has been shown to be involved in memory consolidation and the selective enhancement of newly acquired memories of future relevance (Wilhelm, et al., 2011), limited research has investigated the role of sleep or future relevance in processes of memory reconsolidation. The current research employed a list-method directed forgetting procedure in which participants learned two lists of syllable pairs on Night 1 and received directed forgetting instructions on Night 2. On Night 2, one group (Labile; n = 15) received a memory reactivation treatment consisting of reminders designed to return memories of the learned lists to a labile state. A second group (Stable, n = 16) received similar reminders designed to leave memories of the learned lists in their stable state. No differences in forgetting were found across the two lists or groups. However, a negative correlation between frontal delta (1 – 4 Hz) electroencephalographic (EEG) power during Early Stage 2 non-rapid eye movement (NREM) sleep and forgetting of to-beremembered material was found exclusively in the Labile group (r = -.61, p < .05). Further, central theta (4 – 8 Hz ) EEG power during rapid eye movement (REM) sleep was found to correlate with directed forgetting exclusively in the Labile group (r = .81, p < .001) and total forgetting in the Stable group (r = .50, p < .05). These observed relationships support the proposed hypothesis suggesting that sleep processes are involved in the reconsolidation of labile memories, and that this reconsolidation may be selective for memories of future relevance. A role for sleep in the beneficial reprocessing of memories through the selective reconsolidation of labile memories in NREM sleep and the weakening of memories in REM sleep is discussed.

Abstract: Successful memory encoding depends on the ability to intentionally encode relevant information (via differential encoding) and intentionally forget that which is irrelevant (via inhibition). Both cognitive processes have been shown to decline in aging and are theorized to underlie age-related deficits in the cognitive control of memory. The current study uses the Directed Forgetting paradigm in conjunction with fMRI to investigate age-related differences in both cognitive processes, with the specific aim of elucidating neural evidence supporting these theorized deficits. Results indicate relatively preserved differential encoding, with age differences consistent with previous models of age-related compensation (i.e., increased frontal and bilateral recruitment). Older adults did display noticeable differences in the recruitment of brain regions related to intentional forgetting, specifically exhibiting reduced activity in the right superior prefrontal cortex, a region shown to be critical to inhibitory processing. However, older adults exhibited increased reliance on processing in right inferior parietal lobe associated with successful forgetting. Activity in this region was negatively correlated with activity in the medial temporal lobe, suggesting a shift in the locus of inhibition compared to the frontally mediated inhibition observed in younger adults. Finally, while previous studies found intentional and incidental forgetting to be dissociable in younger adults, this differentiation appears to be reduced in older adults. The current results are the first to provide neural evidence for an age-related reduction in processes that support intentional forgetting.

Abstract: Forgiveness is considered to play a key role in the maintenance of social relationships, the avoidance of unnecessary conflict, and the ability to move forward with one's life. But why is it that some people find it easier to forgive and forget than others? In the current study, we explored the supposed relationship between forgiveness and forgetting. In an initial session, 30 participants imagined that they were the victim in a series of hypothetical incidents and indicated whether or not they would forgive the transgressor. Following a standard think/no-think procedure, in which participants were trained to think or not to think about some of these incidents, more forgetting was observed for incidents that had been forgiven following no-think instructions compared with either think or baseline instructions. In contrast, no such forgetting effects emerged for incidents that had not previously been forgiven. These findings have implications for goal-directed forgetting and the relationship between forgiveness and memory.

Abstract: Conversion disorder (CD) is a condition where neurological symptoms, such as weakness or sensory disturbance, are unexplained by neurological disease and are presumed to be of psychological origin. Contemporary theories of the disorder generally propose dysfunctional frontal control of the motor or sensory systems. Classical (Freudian) psychodynamic theory holds that the memory of stressful life events is repressed. Little is known about the frontal (executive) function of these patients, or indeed their general neuropsychological profile, and psychodynamic theories have been largely untested. This study aimed to investigate neuropsychological functioning in patients with CD, focusing on executive and memory function. A directed forgetting task (DFT) using words with variable emotional valence was also used to investigate memory suppression. 21 patients and 36 healthy controls completed a battery of neuropsychological tests and patients had deficits in executive function and auditory-verbal (but not autobiographical) memory. The executive deficits were largely driven by differences in IQ, anxiety and mood between the groups. A subgroup of 11 patients and 28 controls completed the DFT and whilst patients recalled fewer words overall than controls, there were no significant effects of directed forgetting or valence. This study provides some limited support for deficits in executive, and to a lesser degree, memory function in patients with CD, but did not find evidence of altered memory suppression to support the psychodynamic theory of repression.

Abstract: The literature on directed forgetting – which refers to forgetting the specified information intentionally – has almost exclusively focused on either emotional words or pictures. Consequently, little is known about the impact of facial stimuli that demand more complex cognitive processing than words or pictures. A pilot study was conducted to obtain norm ratings on 152 facial images portraying neutral, happy and angry emotions. From this set of facial stimuli, 96 faces were selected for the main study. In the main study, 75 female participants were presented with 48 faces individually with equal number of happy and angry and, male and female faces. Half the faces were followed by a cue to remember and the remaining half a cue to forget. Following which, all participants were presented with emotionally neutral faces and asked to indicate if they had seen the face or not, including those they were previously told to forget. Results demonstrated that directed forgetting effects were significantly modulated by facial emotions and sex of faces. Specifically, forgetting costs (i.e., impaired memory for to-be-forgotten faces) were eliminated for angry faces and male faces. Given the literature that has documented happy face advantages in remembering (e.g., D'Argembeau, Van der Linden, Comblain, & Etienne, 2003), our findings suggest that forgetting of emotional faces may implicate potentially different mechanisms from those underlying remembering. The findings also imply the important role of emotional