International journal of psychophysiology: official journal of the International Organization of Psychophysiology Impact Factor & Information

Publisher: Elsevier

Current impact factor: 2.88

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2014 Impact Factor 2.882
2013 Impact Factor 2.648
2012 Impact Factor 2.036
2011 Impact Factor 2.144
2010 Impact Factor 2.378
2009 Impact Factor 3.045
2008 Impact Factor 2.264
2007 Impact Factor 2.205
2006 Impact Factor 2.247
2005 Impact Factor 2.584
2004 Impact Factor 1.563
2003 Impact Factor 2.014
2002 Impact Factor 2.055
2001 Impact Factor 1.747
2000 Impact Factor 1.489
1999 Impact Factor 1.829
1998 Impact Factor 1.148
1997 Impact Factor 0.703
1996 Impact Factor 1.089
1995 Impact Factor 0.585
1994 Impact Factor 0.875
1993 Impact Factor 0.684
1992 Impact Factor 0.87

Impact factor over time

Impact factor

Additional details

5-year impact 2.92
Cited half-life 7.90
Immediacy index 0.50
Eigenfactor 0.01
Article influence 0.91
ISSN 1872-7697

Publisher details


  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Authors pre-print on any website, including arXiv and RePEC
    • Author's post-print on author's personal website immediately
    • Author's post-print on open access repository after an embargo period of between 12 months and 48 months
    • Permitted deposit due to Funding Body, Institutional and Governmental policy or mandate, may be required to comply with embargo periods of 12 months to 48 months
    • Author's post-print may be used to update arXiv and RepEC
    • Publisher's version/PDF cannot be used
    • Must link to publisher version with DOI
    • Author's post-print must be released with a Creative Commons Attribution Non-Commercial No Derivatives License
    • Publisher last reviewed on 03/06/2015
  • Classification

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Previous investigations of EEG β processes can be divided into two categories: one in which β enhancement is obtained and one in which β suppression is obtained. The current study investigated the β band range (14-30Hz) by subdividing the signal into 2Hz sub-bands. We presented participants with photographs of faces expressing happy, angry, sad or neutral expressions under two primary tasks in which participants judged the emotion the individual was expressing, or how the way the other person feels makes the participant feel. Results revealed a pattern of both β suppression and enhancement that appeared to depend on whether the task required first-person emotional experience (self-task) or perspective-taking (other-task). Specifically, the self-task was associated with enhancement while the other-task was associated with suppression. While some previous research has reported β enhancement to emotion-inducing stimuli, other research has reported β suppression in tasks also associated with mu suppression. To our knowledge, the current data are the first to reveal both β enhancement and suppression within a single experiment and suggests a neurocognitive dissociation of enhancement and suppression within the β band range.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.005
  • [Show abstract] [Hide abstract]
    ABSTRACT: The current exploratory research examined whether high frequency heart rate variability (HF-HRV) modulates the association between anxiety and (1) executive attentional control during situations involving neutral stimuli, in which the distractor stimuli are in conflict with the target stimulus, and (2) risk aversion in decision making. Forty-five participants (21 with low and 24 with high trait-anxiety) performed a modified version of the Attention Network Test to measure attentional control, and the Balloon Analogue Risk Task to measure risk aversion. HF-HRV was recorded during a rest period before completion of the tasks. Results showed that individuals with high anxiety and low HF-HRV have worse attentional control in the face of conflicting information as well as greater risk aversion, in comparison with individuals with both high anxiety and high HF-HRV or low anxiety (regardless of HF-HRV). HF-HRV was positively associated with attentional control and negatively associated with risk aversion. Furthermore, a strong negative association was observed between attentional control and risk aversion. These results suggest that HF-HRV modulates the influence of anxiety on both attentional control to neutral stimuli, and risk aversion in decision making. Greater HF-HRV appears to fulfill a protective role in highly anxious individuals. The associations observed also suggest that executive control of attention plays a relevant role in decision making. These results support the relevance of the autonomic nervous system in sustained cognition and are in accordance with theories in which vagal-mediated heart rate variability is taken as an indicator of prefrontal cortex inhibitory influences.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.10.007
  • [Show abstract] [Hide abstract]
    ABSTRACT: Prior research has provided evidence that in children sleep and behavior are related. We aimed to determine the association between naturalistic daily variations in sleep and behavioral functioning. African American children, 5.4±1.7years old, living on the south side of Chicago participated in a repeated measures study to assess this sleep-behavior link. Data was obtained from three separate two-week periods of 24-hour actigraphy and the parental version of the Behavioral Assessment System for Children. Canonical correlations analyses were applied to investigate the relation between individual changes in sleep and behavior. After 1-month, weekday average sleep duration primarily related to internalizing behaviors, while within-child variability of sleep related to behavioral changes which may involve internalizing and externalizing symptoms. Week-weekend differences in sleep associated with maladaptive social skills. Over a 6-week period, sleep onset latency and sleep offset latency related to behavioral symptoms and maladaptive skills. Over a period of 3-months, sleep associated with symptomatic behaviors while the adverse impact of within-child variability of sleep attenuated. Alternatively, the week-weekend differences in bedtime, wake-up time, wake after sleep onset and sleep onset latency in particular related to internalizing and externalizing behavior problems. Findings showed that poor sleep related to dysfunctional behaviors. While maladaptive at the beginning, they may develop into symptomatic behaviors with potentially internalizing characteristics. As time goes on, individual changes in sleep onset and offset might be important clinical markers of a chronic 'social dysregulation'. Continued sufficient and regular sleep may improve daytime and nighttime behavioral regulation in early childhood.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.003
  • [Show abstract] [Hide abstract]
    ABSTRACT: The Research Domain Criteria (RDoC) reflects a paradigm shift in mental health research aimed at establishing a science of psychopathology that is grounded in neuroscience. In many ways, the RDoC approach to research has been utilized for decades by psychophysiologists who have leveraged a range of biological measures to study variability in psychological processes as a function of individual differences. We highlight the critical role of psychophysiology in the era of RDoC, and briefly review the 13 papers and commentary that form the current special issue.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.001
  • [Show abstract] [Hide abstract]
    ABSTRACT: The current special issue, devoted to the Research Domain Criteria (RDoC) initiative of the US National Institute of Mental Health, showcases a variety of empirical and review articles that address issues related to this dimensional and multi-method approach to research on mental disorders. Here, we provide an integrative perspective on various aspects of these articles, focused around the primary principles of the RDoC approach and the practical and methodological issues related to conducting RDoC-informed research. The chief point we wish to highlight is that these articles demonstrate the ways in which the field of psychophysiology already thinks along the lines of RDoC in terms of using biobehavioral constructs, looking for convergence amongst constructs using various methodologies, and utilizing dimensional measurements in studies. In this sense, RDoC is not novel; however, by specifying a formal research platform it provides explicit encouragement and guidance for using such principles in understanding psychiatric phenomena, rather than continuing to focus research efforts on traditional diagnostic categories alone.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.002
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background: Neuroimaging studies suggest that acute sleep deprivation can lead to adaptations, such as compensatory recruitment of cerebral structures, to maintain cognitive performance despite sleep loss. However, the understanding of the neurochemical alterations related to these adaptations remains incomplete. Objective: Investigate BDNF levels, cognitive performance and their relations in healthy subjects after acute sleep deprivation. Methods: Nineteen sleep deprived (22,11±3,21years) and twenty control (25,10±4,42years) subjects completed depression, anxiety and sleep quality questionnaires. Sleep deprived group spent a full night awake performing different playful activities to keep themselves from sleeping. Attention, response inhibition capacity and working memory (prefrontal cortex-dependent) were assessed with Stroop and Digit-span tests. Declarative memory (hippocampus-dependent) was assessed with Logical Memory test. Serum BDNF was measured by sandwich ELISA. Data were analyzed with independent samples T-test, ANOVA, ANCOVA and curve estimation regressions. P<0.05 was deemed statistically significant. Results: The sleep deprived group showed higher BDNF levels and normal performance on attention, response inhibition capacity and working memory. However, declarative memory was impaired. A sigmoidal relation between BDNF and Stroop Test scores was found. Conclusions: Increased BDNF could be related, at least in part, to the maintenance of normal prefrontal cognitive functions after sleep deprivation. This potential relation should be further investigated.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.008

  • International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.007
  • [Show abstract] [Hide abstract]
    ABSTRACT: Fear conditioning research on threat predictability has primarily examined the impact of temporal (i.e., timing) predictability on the startle reflex. However, there are other key features of threat that can vary in predictability. For example, the reinforcement rate (i.e., frequency) of threat is a crucial factor underlying fear learning. The present study examined the impact of threat reinforcement rate on the startle reflex and self-reported anxiety during a fear conditioning paradigm. Forty-five participants completed a fear learning task in which the conditioned stimulus was reinforced with an electric shock to the forearm on 50% of trials in one block and 75% of trials in a second block, in counter-balanced order. The present study also examined whether intolerance of uncertainty (IU), the tendency to perceive or experience uncertainty as stressful or unpleasant, was associated with the startle reflex during conditions of low (50%) vs. high (75%) reinforcement. Results indicated that, across all participants, startle was greater during the 75% relative to the 50% reinforcement condition. IU was positively correlated with startle potentiation (i.e., increased startle response to the CS+ relative to the CS-) during the 50%, but not the 75%, reinforcement condition. Thus, despite receiving fewer electric shocks during the 50% reinforcement condition, individuals with high IU uniquely demonstrated greater defense system activation when impending threat was more uncertain. The association between IU and startle was independent of state anxiety. The present study adds to a growing literature on threat predictability and aversive responding, and suggests IU is associated with abnormal responding in the context of uncertain threat.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.006
  • [Show abstract] [Hide abstract]
    ABSTRACT: Selective attention and its adaptation by cognitive control processes are considered a core aspect of goal-directed action. Often, selective attention is studied behaviorally with conflict tasks, but an emerging neuroscientific method for the study of selective attention is EEG frequency tagging. It applies different flicker frequencies to the stimuli of interest eliciting steady state visual evoked potentials (SSVEPs) in the EEG. These oscillating SSVEPs in the EEG allow tracing the allocation of selective attention to each tagged stimulus continuously over time. The present behavioral investigation points to an important caveat of using tagging frequencies: The flicker of stimuli not only produces a useful neuroscientific marker of selective attention, but interacts with the adaptation of selective attention itself. Our results indicate that RT patterns of adaptation after response conflict (so-called conflict adaptation) are reversed when flicker frequencies switch at once. However, this effect of frequency switches is specific to the adaptation by conflict-driven control processes, since we find no effects of frequency switches on inhibitory control processes after no-go trials. We discuss the theoretical implications of this finding and propose precautions that should be taken into account when studying conflict adaptation using frequency tagging in order to control for the described confounds.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 11/2015; DOI:10.1016/j.ijpsycho.2015.11.012

  • International journal of psychophysiology: official journal of the International Organization of Psychophysiology 10/2015; DOI:10.1016/j.ijpsycho.2015.10.003
  • [Show abstract] [Hide abstract]
    ABSTRACT: Electroencephalographic (EEG) has been believed to be a potential psychophysiological measure of mental workload. There however remain a number of challenges in building a generalized mental workload recognition model, one of which includes the inability of an EEG-based workload classifier trained on a specific task to handle other tasks. The primary goal of the present study was to examine the possibility of addressing this challenge using feature selection and regression model. Support vector machine classifier and regression models were examined under within-task conditions (trained and tested on the same task) and cross-task conditions (trained on one task and tested on another task) for well-trained verbal and spatial n-back tasks. A specifically designed cross-task recursive feature elimination (RFE) based feature selection was used to handle the possible causes responsible for the deterioration of the performance of cross-task regression model. The within-task classification and regression performed fairly well. Cross-task classification and regression performance, however, deteriorated to unacceptable levels (around chance level). Trained and tested with the most robust feature subset selected by cross-task RFE, the performance of cross-task regression was significantly improved, and there were no significant changes in the performance of within-task regression. It can be inferred that workload-related features can be picked out from those which have been contaminated using RFE, and regression models rather than classifiers may be a wiser choice for cross-task conditions. These encouraging results suggest that the cross-task workload recognition model built in this study is much more generalizable across task when compared to the model built in traditional way.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 10/2015; DOI:10.1016/j.ijpsycho.2015.10.004
  • [Show abstract] [Hide abstract]
    ABSTRACT: Background: Chronic vagus nerve stimulation (VNS) is a recognized treatment for refractory epilepsy and depression. The vagus nerve projects to several brainstem autonomic structures. As pupillary measures are an easy and non-invasive method to evaluate autonomic functioning, we used resting diameter and light reflex measures to investigate the influence of VNS on the human central autonomic nervous system. Method: We studied 21 patients (7 with major depression, 14 with epilepsy) treated with chronic VNS (30s ON, 5min OFF stimulation trains). Resting pupil size and light reflex measures were compared in consecutive intervals with (ON) and without stimulation (OFF). Results: Compared to the OFF condition, the ON condition was associated with a significant increase in resting pupil diameter, but did not affect light reflex measures. There was no group difference between the two populations of patients (depression and epilepsy) on any of the pupil measures. Conclusion: VNS at clinically significant levels increases resting pupil diameter.
    International journal of psychophysiology: official journal of the International Organization of Psychophysiology 10/2015; DOI:10.1016/j.ijpsycho.2015.10.001