human
***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: Electroencephalography (EEG)-neurofeedback has been shown to offer therapeutic benefits to patients with attention-deficit/hyperactivity disorder ( ADHD ) in several , mostly uncontrolled studies . This pilot study is design ed to test the feasibility and safety of using a double-blind placebo feedback-controlled design and to explore the initial efficacy of individualized EEG-neurofeedback training in children with ADHD . Fourteen children ( 8–15 years ) with ADHD defined according to the DSM-IV-TR criteria were r and omly allocated to 30 sessions of EEG-neurofeedback ( n = 8) or placebo feedback ( n = 6 ) . Safety measures ( adverse events and sleep problems ) , ADHD symptoms and global improvement were monitored . With respect to feasibility , all children completed the study and attended all study visits and training sessions . No significant adverse effects or sleep problems were reported . Regarding the expectancy , 75 % of children and their parent(s ) in the active neurofeedback group and 50 % of children and their parent(s ) in the placebo feedback group thought they received placebo feedback training . Analyses revealed significant improvements of ADHD symptoms over time , but changes were similar for both groups . This pilot study shows that it is feasible to conduct a rigorous placebo-controlled trial to investigate the efficacy of neurofeedback training  in children with ADHD . However , a double-blind design may not be feasible since using automatic adjusted reward thresholds may not work as effective as manually adjusted reward thresholds . Additionally , implementation of active learning strategies may be an important factor for the efficacy of EEG-neurofeedback training . Based on the results of this pilot study , changes are made in the design of the ongoing study Neurofeedback treatment has been demonstrated to reduce inattention , impulsivity and hyperactivity in children with attention deficit/hyperactivity disorder ( ADHD ) . However , previous studies did not adequately control confounding variables or did not employ a r and omized reinforcer-controlled design . This study addresses those method ological shortcomings by comparing the effects of the following two matched biofeedback training variants on the primary symptoms of ADHD : EEG neurofeedback ( NF ) aim ing at theta/beta ratio reduction and EMG biofeedback ( BF ) aim ing at forehead muscle relaxation . Thirty-five children with ADHD ( 26 boys , 9 girls ; 6–14 years old ) were r and omly assigned to either the therapy group ( NF ; n = 18 ) or the control group ( BF ; n = 17 ) . Treatment for both groups consisted of 30 sessions . Pre- and post-treatment assessment consisted of psychophysiological measures , behavioural rating scales completed by parents and teachers , as well as psychometric measures . Training effectively reduced theta/beta ratios and EMG levels in the NF and BF groups , respectively . Parents reported significant reductions in primary ADHD symptoms , and inattention improvements in the NF group were higher compared to the control intervention ( BF , dcorr = −.94 ) . NF training also improved attention and reaction times on the psychometric measures . The results indicate that NF effectively reduced inattention symptoms on parent rating scales and reaction time in neuropsychological tests . However , regarding hyperactivity and impulsivity symptoms , the results imply that non-specific factors , such as behavioural contingencies , self-efficacy , structured learning environment and feed-forward processes , may also contribute to the positive behavioural effects induced by neurofeedback training Objective : Preparing for a definitive r and omized clinical trial ( RCT ) of neurofeedback ( NF ) for ADHD , this pilot trial explored feasibility of a double-blind , sham-controlled design and adherence/palatability/relative effect of two versus three treatments/week . Method : Unmedicated 6- to 12-year-olds with Diagnostic and Statistical Manual of Mental Disorders ( 4th ed . ; DSM-IV ) ADHD were r and omized to active NF versus sham-NF and to 2X versus 3X/week treatment frequency . Frequency switch was allowed after Treatment 24 . Results : In two school years , 39 participants were recruited and 34 ( 87 % ) completed all 40 treatments . Child/parent guesses about assigned treatment were no better than chance . At Treatment 24 , 38 % chose 2X/week and 62 % chose 3X/week . Both active NF and sham yielded large pre – post improvement on parent ratings  but NF no more than sham . Conclusion : Blinding appears to work , and sham does not prevent recruitment/retention . Treatment frequency of 3X/week seems preferred over 2X/week and was as effective . A large double-blind RCT is feasible and necessary to test specific NF effectiveness OBJECTIVE : To evaluate sustained improvements 6 months after a 40-session , in-school computer attention training intervention using neurofeedback or cognitive training ( CT ) administered to 7- to 11-year-olds with attention-deficit/hyperactivity disorder ( ADHD ) . METHODS : One hundred four children were r and omly assigned to receive neurofeedback , CT , or a control condition and were evaluated 6 months postintervention . A 3-point growth model assessed change over time across the conditions on the Conners 3–Parent Assessment Report ( Conners 3-P ) , the Behavior Rating Inventory of Executive Function Parent Form ( BRIEF ) , and a systematic double-blinded classroom observation ( Behavioral Observation of Students in Schools ) . Analysis of variance assessed community-initiated changes in stimulant medication . RESULTS : Parent response rates were 90 % at the 6-month follow-up . Six months postintervention , neurofeedback participants maintained significant gains on Conners 3-P ( Inattention effect size [ ES ] = 0.34 , Executive Functioning ES = 0.25 , Hyperactivity/Impulsivity ES = 0.23 ) and BRIEF subscales including the Global Executive Composite ( ES = 0.31 ) , which remained significantly greater than gains found among children in CT and control conditions . Children in the CT condition showed delayed improvement over immediate postintervention ratings only on Conners 3-P Executive Functioning ( ES = 0.18 ) and 2 BRIEF subscales . At the 6-month follow-up , neurofeedback participants maintained the same stimulant medication dosage , whereas participants in both CT and control conditions showed statistically and clinical ly significant increases ( 9 mg [ P = .002 ] and 13 mg [ P < .001 ] , respectively ) . CONCLUSIONS : Neurofeedback participants made more prompt and greater improvements in ADHD symptoms , which were sustained at the 6-month follow-up , than did CT participants or those in the control group . This finding suggests that neurofeedback is a promising attention training treatment for children with ADHD Objective : Additional treatments with persisting benefit are needed for ADHD . Because ADHD often shows excessive theta electroencephalogram ( EEG ) power , low beta , and excessive theta-beta ratio ( TBR ) , a promising treatment is neurofeedback ( NF ) downtraining TBR . Although several nonblind r and omized clinical trials ( RCTs ) show a medium-large benefit for NF , a well-blinded , sham-controlled RCT is needed to differentiate specific from nonspecific effects . Method : Experts in NF , ADHD , clinical trials , and statistics collaborated to design a double-blind multisite RCT . Results / Conclusion : At four sites , 180 children aged 7 to 10 years with rigorously diagnosed ADHD and TBR ≥ 5 will be r and omized to active TBR-NF versus sham NF of equal duration , intensity , and appearance . Sham , utilizing prerecorded EEGs with participant artifacts superimposed , will keep participants and staff blind . Treatment fidelity will be trained/monitored by acknowledged NF leaders . Multidomain assessment s before , during , and after treatment ( follow-up to 2 years ) will also include tests of blinding and sham inertness Objective : To evaluate the efficacy of 2 computer attention training systems administered in school for children with attention-deficit hyperactivity disorder ( ADHD ) . Method : Children in second and fourth grade with a diagnosis of ADHD ( n = 104 ) were r and omly assigned to neurofeedback ( NF ) ( n = 34 ) , cognitive training ( CT ) ( n = 34 ) , or control ( n = 36 ) conditions . A 2-point growth model assessed change from pre-post intervention on parent reports ( Conners 3-Parent [ Conners 3-P ] ; Behavior Rating Inventory of Executive Function [ BRIEF ] rating scale ) , teacher reports ( Swanson , Kotkin , Agler , M-Flynn and Pelham scale [ SKAMP ] ; Conners 3-Teacher [ Conners 3-T ] ) , and systematic classroom observations ( Behavioral Observation of Students in Schools [ BOSS ] ) . Paired t tests and an analysis of covariance assessed change in medication . Results : Children who received NF showed significant improvement compared with those in the control condition on the Conners 3-P Attention , Executive Functioning and Global Index , on all BRIEF summary indices , and on BOSS motor/verbal off-task behavior . Children who received CT showed no improvement compared to the control condition . Children in the NF condition showed significant improvements compared to those in the CT condition on Conners 3-P Executive Functioning , all BRIEF summary indices , SKAMP Attention , and Conners 3-T Inattention subscales . Stimulant medication dosage in methylpheni date equivalencies significantly increased for children in the CT ( 8.54 mg ) and control ( 7.05 mg ) conditions but not for those in the NF condition ( 0.29 mg ) . Conclusion : Neurofeedback made greater improvements in ADHD symptoms compared to both the control and CT conditions . Thus , NF is a promising attention training treatment intervention for children with ADHD In recent years a rising amount of r and omized controlled trials , review s , and meta-analyses relating to the efficacy of electroencephalographic-neurofeedback ( EEG-NF ) in children with attention-deficit/hyperactivity disorder ( ADHD ) have been published . Although clinical reports and open treatment studies suggest EEG-NF to be effective , double blind placebo-controlled studies as well as a rigorous meta- analysis failed to find support for the efficacy of EEG-NF . Since absence of evidence does not equate with evidence of absence , we will outline how future research might overcome the present method ological limitations . To provide conclusive evidence for the presence or absence of the efficacy of EEG-NF  in the treatment of ADHD , there is a need to set up a well- design ed study that ensures optimal implementation and embedding of the training , and possibly incorporates different forms of neurofeedback BACKGROUND For children with attention deficit/hyperactivity disorder ( ADHD ) , a reduction of inattention , impulsivity and hyperactivity by neurofeedback ( NF ) has been reported in several studies . But so far , unspecific training effects have not been adequately controlled for and /or studies do not provide sufficient statistical power . To overcome these method ological shortcomings we evaluated the clinical efficacy of neurofeedback in children with ADHD in a multisite r and omised controlled study using a computerised attention skills training as a control condition . METHODS 102 children with ADHD , aged 8 to 12 years , participated in the study . Children performed either 36 sessions of NF training or a computerised attention skills training within two blocks of about four weeks each ( r and omised group assignment ) . The combined NF treatment consisted of one block of theta/beta training and one block of slow cortical potential ( SCP ) training . Pre-training , intermediate and post-training assessment encompassed several behaviour rating scales ( e.g. , the German ADHD rating scale , FBB-HKS ) completed by parents and teachers . Evaluation ( ' placebo ' ) scales were applied to control for parental expectations and satisfaction with the treatment . RESULTS For parent and teacher ratings , improvements in the NF group were superior to those of the control group . For the parent-rated FBB-HKS total score ( primary outcome measure ) , the effect size was .60 . Comparable effects were obtained for the two NF protocol s ( theta/beta training , SCP training ) . Parental attitude towards the treatment did not differ between NF and control group . CONCLUSIONS Superiority of the combined NF training indicates clinical efficacy of NF in children with ADHD . Future studies should further address the specificity of effects and how to optimise the benefit of NF as treatment module for ADHD Background A r and omized and controlled clinical study was performed to evaluate the use of neurofeedback ( NF ) to treat  attention-deficit/hyperactivity disorder ( ADHD ) in children and adolescents . Methods The ADHD population was selected from an outpatient clinic for Child and Adolescent Mental Health in Norway . Ninety-one of the 275 children and adolescents ranging in age from 6 to 18 years ( 10.5 years ) participated in 30 sessions of an intensive NF program . The reinforcement contingency was based on the subjects ’ production of cortical beta1 activity ( 15–18 Hz ) . The ADHD participants were r and omized into three groups , with 30 in the NF group , 31 controls in a group that was given methylpheni date , and 30 in a group that received NF and methylpheni date .  ADHD core symptoms were reported by parents using the parent form of the Clinician ’s Manual for Assessment by Russell A. Barkley . Results Ninety-one children and adolescents were effectively r and omized by age , sex , intelligence and distribution of ADHD core symptoms . The parents reported significant effects of the treatments , but no significant differences between the treatment groups were observed . Conclusions NF was as effective as methylpheni date at treating the attentional and hyperactivity symptoms of ADHD , based on parental reports . Trial registration Current Controlled Trials OBJECTIVE The purpose of this pilot study was to compare the effects of 30 sessions of neurofeedback ( NF ) with stimulant medication on attention-deficit/hyperactivity dis 
    Output:
    
agent
Conclusions : This meta- analysis of EEG-NF in children with ADHD highlights improvement in the inattention dimension of ADHD symptoms .
***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: Electroencephalography (EEG)-neurofeedback has been shown to offer therapeutic benefits to patients with attention-deficit/hyperactivity disorder ( ADHD ) in several , mostly uncontrolled studies . This pilot study is design ed to test the feasibility and safety of using a double-blind placebo feedback-controlled design and to explore the initial efficacy of individualized EEG-neurofeedback training in children with ADHD . Fourteen children ( 8–15 years ) with ADHD defined according to the DSM-IV-TR criteria were r and omly allocated to 30 sessions of EEG-neurofeedback ( n = 8) or placebo feedback ( n = 6 ) . Safety measures ( adverse events and sleep problems ) , ADHD symptoms and global improvement were monitored . With respect to feasibility , all children completed the study and attended all study visits and training sessions . No significant adverse effects or sleep problems were reported . Regarding the expectancy , 75 % of children and their parent(s ) in the active neurofeedback group and 50 % of children and their parent(s ) in the placebo feedback group thought they received placebo feedback training . Analyses revealed significant improvements of ADHD symptoms over time , but changes were similar for both groups . This pilot study shows that it is feasible to conduct a rigorous placebo-controlled trial to investigate the efficacy of neurofeedback training  in children with ADHD . However , a double-blind design may not be feasible since using automatic adjusted reward thresholds may not work as effective as manually adjusted reward thresholds . Additionally , implementation of active learning strategies may be an important factor for the efficacy of EEG-neurofeedback training . Based on the results of this pilot study , changes are made in the design of the ongoing study Neurofeedback treatment has been demonstrated to reduce inattention , impulsivity and hyperactivity in children with attention deficit/hyperactivity disorder ( ADHD ) . However , previous studies did not adequately control confounding variables or did not employ a r and omized reinforcer-controlled design . This study addresses those method ological shortcomings by comparing the effects of the following two matched biofeedback training variants on the primary symptoms of ADHD : EEG neurofeedback ( NF ) aim ing at theta/beta ratio reduction and EMG biofeedback ( BF ) aim ing at forehead muscle relaxation . Thirty-five children with ADHD ( 26 boys , 9 girls ; 6–14 years old ) were r and omly assigned to either the therapy group ( NF ; n = 18 ) or the control group ( BF ; n = 17 ) . Treatment for both groups consisted of 30 sessions . Pre- and post-treatment assessment consisted of psychophysiological measures , behavioural rating scales completed by parents and teachers , as well as psychometric measures . Training effectively reduced theta/beta ratios and EMG levels in the NF and BF groups , respectively . Parents reported significant reductions in primary ADHD symptoms , and inattention improvements in the NF group were higher compared to the control intervention ( BF , dcorr = −.94 ) . NF training also improved attention and reaction times on the psychometric measures . The results indicate that NF effectively reduced inattention symptoms on parent rating scales and reaction time in neuropsychological tests . However , regarding hyperactivity and impulsivity symptoms , the results imply that non-specific factors , such as behavioural contingencies , self-efficacy , structured learning environment and feed-forward processes , may also contribute to the positive behavioural effects induced by neurofeedback training Objective : Preparing for a definitive r and omized clinical trial ( RCT ) of neurofeedback ( NF ) for ADHD , this pilot trial explored feasibility of a double-blind , sham-controlled design and adherence/palatability/relative effect of two versus three treatments/week . Method : Unmedicated 6- to 12-year-olds with Diagnostic and Statistical Manual of Mental Disorders ( 4th ed . ; DSM-IV ) ADHD were r and omized to active NF versus sham-NF and to 2X versus 3X/week treatment frequency . Frequency switch was allowed after Treatment 24 . Results : In two school years , 39 participants were recruited and 34 ( 87 % ) completed all 40 treatments . Child/parent guesses about assigned treatment were no better than chance . At Treatment 24 , 38 % chose 2X/week and 62 % chose 3X/week . Both active NF and sham yielded large pre – post improvement on parent ratings  but NF no more than sham . Conclusion : Blinding appears to work , and sham does not prevent recruitment/retention . Treatment frequency of 3X/week seems preferred over 2X/week and was as effective . A large double-blind RCT is feasible and necessary to test specific NF effectiveness OBJECTIVE : To evaluate sustained improvements 6 months after a 40-session , in-school computer attention training intervention using neurofeedback or cognitive training ( CT ) administered to 7- to 11-year-olds with attention-deficit/hyperactivity disorder ( ADHD ) . METHODS : One hundred four children were r and omly assigned to receive neurofeedback , CT , or a control condition and were evaluated 6 months postintervention . A 3-point growth model assessed change over time across the conditions on the Conners 3–Parent Assessment Report ( Conners 3-P ) , the Behavior Rating Inventory of Executive Function Parent Form ( BRIEF ) , and a systematic double-blinded classroom observation ( Behavioral Observation of Students in Schools ) . Analysis of variance assessed community-initiated changes in stimulant medication . RESULTS : Parent response rates were 90 % at the 6-month follow-up . Six months postintervention , neurofeedback participants maintained significant gains on Conners 3-P ( Inattention effect size [ ES ] = 0.34 , Executive Functioning ES = 0.25 , Hyperactivity/Impulsivity ES = 0.23 ) and BRIEF subscales including the Global Executive Composite ( ES = 0.31 ) , which remained significantly greater than gains found among children in CT and control conditions . Children in the CT condition showed delayed improvement over immediate postintervention ratings only on Conners 3-P Executive Functioning ( ES = 0.18 ) and 2 BRIEF subscales . At the 6-month follow-up , neurofeedback participants maintained the same stimulant medication dosage , whereas participants in both CT and control conditions showed statistically and clinical ly significant increases ( 9 mg [ P = .002 ] and 13 mg [ P < .001 ] , respectively ) . CONCLUSIONS : Neurofeedback participants made more prompt and greater improvements in ADHD symptoms , which were sustained at the 6-month follow-up , than did CT participants or those in the control group . This finding suggests that neurofeedback is a promising attention training treatment for children with ADHD Objective : Additional treatments with persisting benefit are needed for ADHD . Because ADHD often shows excessive theta electroencephalogram ( EEG ) power , low beta , and excessive theta-beta ratio ( TBR ) , a promising treatment is neurofeedback ( NF ) downtraining TBR . Although several nonblind r and omized clinical trials ( RCTs ) show a medium-large benefit for NF , a well-blinded , sham-controlled RCT is needed to differentiate specific from nonspecific effects . Method : Experts in NF , ADHD , clinical trials , and statistics collaborated to design a double-blind multisite RCT . Results / Conclusion : At four sites , 180 children aged 7 to 10 years with rigorously diagnosed ADHD and TBR ≥ 5 will be r and omized to active TBR-NF versus sham NF of equal duration , intensity , and appearance . Sham , utilizing prerecorded EEGs with participant artifacts superimposed , will keep participants and staff blind . Treatment fidelity will be trained/monitored by acknowledged NF leaders . Multidomain assessment s before , during , and after treatment ( follow-up to 2 years ) will also include tests of blinding and sham inertness Objective : To evaluate the efficacy of 2 computer attention training systems administered in school for children with attention-deficit hyperactivity disorder ( ADHD ) . Method : Children in second and fourth grade with a diagnosis of ADHD ( n = 104 ) were r and omly assigned to neurofeedback ( NF ) ( n = 34 ) , cognitive training ( CT ) ( n = 34 ) , or control ( n = 36 ) conditions . A 2-point growth model assessed change from pre-post intervention on parent reports ( Conners 3-Parent [ Conners 3-P ] ; Behavior Rating Inventory of Executive Function [ BRIEF ] rating scale ) , teacher reports ( Swanson , Kotkin , Agler , M-Flynn and Pelham scale [ SKAMP ] ; Conners 3-Teacher [ Conners 3-T ] ) , and systematic classroom observations ( Behavioral Observation of Students in Schools [ BOSS ] ) . Paired t tests and an analysis of covariance assessed change in medication . Results : Children who received NF showed significant improvement compared with those in the control condition on the Conners 3-P Attention , Executive Functioning and Global Index , on all BRIEF summary indices , and on BOSS motor/verbal off-task behavior . Children who received CT showed no improvement compared to the control condition . Children in the NF condition showed significant improvements compared to those in the CT condition on Conners 3-P Executive Functioning , all BRIEF summary indices , SKAMP Attention , and Conners 3-T Inattention subscales . Stimulant medication dosage in methylpheni date equivalencies significantly increased for children in the CT ( 8.54 mg ) and control ( 7.05 mg ) conditions but not for those in the NF condition ( 0.29 mg ) . Conclusion : Neurofeedback made greater improvements in ADHD symptoms compared to both the control and CT conditions . Thus , NF is a promising attention training treatment intervention for children with ADHD In recent years a rising amount of r and omized controlled trials , review s , and meta-analyses relating to the efficacy of electroencephalographic-neurofeedback ( EEG-NF ) in children with attention-deficit/hyperactivity disorder ( ADHD ) have been published . Although clinical reports and open treatment studies suggest EEG-NF to be effective , double blind placebo-controlled studies as well as a rigorous meta- analysis failed to find support for the efficacy of EEG-NF . Since absence of evidence does not equate with evidence of absence , we will outline how future research might overcome the present method ological limitations . To provide conclusive evidence for the presence or absence of the efficacy of EEG-NF  in the treatment of ADHD , there is a need to set up a well- design ed study that ensures optimal implementation and embedding of the training , and possibly incorporates different forms of neurofeedback BACKGROUND For children with attention deficit/hyperactivity disorder ( ADHD ) , a reduction of inattention , impulsivity and hyperactivity by neurofeedback ( NF ) has been reported in several studies . But so far , unspecific training effects have not been adequately controlled for and /or studies do not provide sufficient statistical power . To overcome these method ological shortcomings we evaluated the clinical efficacy of neurofeedback in children with ADHD in a multisite r and omised controlled study using a computerised attention skills training as a control condition . METHODS 102 children with ADHD , aged 8 to 12 years , participated in the study . Children performed either 36 sessions of NF training or a computerised attention skills training within two blocks of about four weeks each ( r and omised group assignment ) . The combined NF treatment consisted of one block of theta/beta training and one block of slow cortical potential ( SCP ) training . Pre-training , intermediate and post-training assessment encompassed several behaviour rating scales ( e.g. , the German ADHD rating scale , FBB-HKS ) completed by parents and teachers . Evaluation ( ' placebo ' ) scales were applied to control for parental expectations and satisfaction with the treatment . RESULTS For parent and teacher ratings , improvements in the NF group were superior to those of the control group . For the parent-rated FBB-HKS total score ( primary outcome measure ) , the effect size was .60 . Comparable effects were obtained for the two NF protocol s ( theta/beta training , SCP training ) . Parental attitude towards the treatment did not differ between NF and control group . CONCLUSIONS Superiority of the combined NF training indicates clinical efficacy of NF in children with ADHD . Future studies should further address the specificity of effects and how to optimise the benefit of NF as treatment module for ADHD Background A r and omized and controlled clinical study was performed to evaluate the use of neurofeedback ( NF ) to treat  attention-deficit/hyperactivity disorder ( ADHD ) in children and adolescents . Methods The ADHD population was selected from an outpatient clinic for Child and Adolescent Mental Health in Norway . Ninety-one of the 275 children and adolescents ranging in age from 6 to 18 years ( 10.5 years ) participated in 30 sessions of an intensive NF program . The reinforcement contingency was based on the subjects ’ production of cortical beta1 activity ( 15–18 Hz ) . The ADHD participants were r and omized into three groups , with 30 in the NF group , 31 controls in a group that was given methylpheni date , and 30 in a group that received NF and methylpheni date .  ADHD core symptoms were reported by parents using the parent form of the Clinician ’s Manual for Assessment by Russell A. Barkley . Results Ninety-one children and adolescents were effectively r and omized by age , sex , intelligence and distribution of ADHD core symptoms . The parents reported significant effects of the treatments , but no significant differences between the treatment groups were observed . Conclusions NF was as effective as methylpheni date at treating the attentional and hyperactivity symptoms of ADHD , based on parental reports . Trial registration Current Controlled Trials OBJECTIVE The purpose of this pilot study was to compare the effects of 30 sessions of neurofeedback ( NF ) with stimulant medication on attention-deficit/hyperactivity dis 
    Output:
    