
Amir Jahanian NajafabadiBielefeld University · Cognitive Neuroscience
Amir Jahanian Najafabadi
Doctor of Philosophy
About
52
Publications
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Introduction
Dr. Jahanian Najafabadi investigates the plasticity of minimal-self in life-span to extend the knowledge of how virtual & real-life changes in sensorimotor experiences shape perception of time, body ownership, agency & location as well as understanding the role of uni/multisensory feedback in motor learning using AR/VR with EEG/ERPs techniques. He also uses ML & DL techniques contributing to development of personalized treatment for neurological & psychiatric disorders using brain imaging data.
Additional affiliations
February 2023 - present
Publications
Publications (52)
We previously reported that after virtual tool use training, younger as compared to older adults experienced a higher sense of ownership over virtual tools associated with changes in sensorimotor representation (i.e., body schema). Moreover, higher agency ratings were contingent on their performance levels and the extent to which the virtual tool w...
In young adults (YA) who practised controlling a virtual tool in augmented reality (AR), the emergence of a sense of body ownership over the tool was associated with the integration of the virtual tool into the body schema (BS). Agency emerged independent of BS plasticity. Here we aimed to replicate these findings in older adults (OA). Although the...
In this study we examined if training with a virtual tool in augmented reality (AR) affects the emergence of ownership and agency over the tool and whether this relates to changes in body schema (BS). 34 young adults learned controlling a virtual gripper to grasp a virtual object. In the visuo-tactile (VT) but not the vision-only (V) condition, vib...
We examined whether resting-state and task-related oscillations differently predict the practice effect during virtual tool-use training in young (YA) and older (OA) adults. Thirty-seven YA (Mage: 23.64, SD: 7.07) and forty-one OA (Mage: 68.92, SD: 4.49) learned to control a virtual gripper to grasp a virtual object. The training was organized in t...
The sense of agency (SoA) refers to the perception that one's actions are influential and that one assumes responsibility for their consequences. In coordinated joint actions, a sense of joint agency emerges, with interaction and cooperation being crucial for enhancing SoA. Prior research indicates that the right temporoparietal junction (rTPJ) is...
In line with our prior research, we aimed to identify and classify biomarkers of major depressive disorder (MDD) using electroencephalography (EEG) in patients and age-matched healthy children and adolescents. To achieve this, resting-state eyes-closed EEG data were pre-processed, and the analysis was performed on a channel-wise and Regions of Inte...
This research aimed to use the Convolutional Neural Networks (CNN) to identify biomarkers in Children and Adolescents with Major Depressive Disorder (MDD) apart from age-matched healthy young individuals. To achieve this, resting-state eyes-closed electroencephalography (EEG) was pre-processed, and the analysis was performed based on frequency band...
Prior research by Sun and Tang (2021) found that using a tool increased the perceived size of the forearm, while the perception of other body parts remained unchanged. Their study demonstrated that proprioceptive information from one limb can influence the body schema of another limb, even if that limb is not directly using the tool. In this resear...
Abstract — This chapter reviews deep learning models previously used to identify neuro-biomarkers related to major depressive disorder in both adults and children, detailing the outcomes of prior research and current advancements in this field. In addition, this chapter explores the use of convolutional neural networks to classify and detect neuro-...
Abstract
Tool-use is a hallmark of humans, enabling us to engage with our surroundings by accessing objects positioned at various distances and locations. Recent studies are exploring whether we experience similar sensations of ownership and agency over physical and virtual tools. Prior research conducted by Jahanian Najafabadi et al. (2023ab) foun...
Prior research has shown that the use of a mechanical grabber induced changes in the sensorimotor representation of the forearm of younger aged participants, but not of older adults. For instance, Martel et al. (2021) highlighted a gradual developmental trajectory in the integration of tools, observing a U-shaped pattern between early and middle pu...
Abstract
Previous work has suggested that our perception of time is plastic and dependent on the distance of the stimulus to our body. For example, Anelli et al (2015) showed that stimuli presented in peri-personal and far space are judged differently and that this distance-effect on time perception can be shaped by training participants with a too...
Previous work has suggested that our perception of time is plastic and dependent on the distance of the stimulus to our body. For example, Anneli et al (2015) showed that stimuli presented in peri-personal and far space are judged differently and that this distance effect on time perception can be shaped by training participants with a tool that ef...
Nowadays, the product development processes have faced challenges for more effective, agile characteristics. Moreover, traditional methods for data retrieval from customers for their behavioral prediction have lost their efficiency. Social media platforms have provided enormous potentials for discovery of customer behavioral models. In the current...
Previous studies have applied Deep learning models on Electroencephalography data for classification and prediction tasks. In this work, we aim to test a model using convolutional neural network (CNN) in order to identify biomarkers in childhood and Adolescents with major depression disorder from age matched healthy young individuals. CNN used to tr...
In our daily life, we are continuously required to learn new motor skills and adapt these skills to new situations, such as during tool-use. Tool-use as one of the hallmark skills in humans servse to functionally extend our body to overcome physical limitations to interact or manipulate other objects or organisms in an environment. Tool-body intera...
In young adults (YA) who practised controlling a virtual tool in augmented reality (AR), the emergence of a sense of body ownership over the tool was associated with the integration of the virtual tool into the body schema (BS). Agency emerged independent of BS plasticity. Here we aimed to replicate these findings in older adults (OA). Although the...
In this study we examined if training with a virtual tool in augmented reality (AR) affects the emergence of ownership and agency over the tool and whether this relates to changes in body schema (BS). 34 young adults learned controlling a virtual gripper to grasp a virtual object. In the visuo-tactile (VT) but not the vision-only (V) condition, vib...
We investigated whether resting-state EEG predict learning slope during and after tool-use training in augmented reality and whether such changes are associated with performance in tactile localization test (TLT) as indicator of embodiment and body schema plasticity. 34 young and 40 older adults underwent a virtual tool-use training in AR with and...
Abstract Submission Topic: S_D. Sensory and Motor Systems / D.5 Tactile/somatosensory system / D.5.a Peripheral receptors Abstract Body
Aims: We investigated whether training with a virtual tool in augmented reality (AR) has comparable effects on body schema (BS) and sense of ownership and agency in young and older adults, while leveraging AR to p...
Background
Epidemiological studies are necessary to develop diagnostic standards for mental disorders. Therefore, this study investigated the prevalence of anxiety disorders, and its correlation with different substances used by patients diagnosed with substance use disorder referred to the Iran Psychiatric Hospital located in Tehran, Iran. Two hun...
Mechanical Engineering is often considered a course for men, however, during the past few years, the number of women enrolling and concluding the course is increasing, particularly in Portugal and at the Faculty of Engineering of the University of Porto (FEUP). The present study aims to analyse the female students that finished the Mechanical Engin...
In this study we aimed to investigate whether beliefs on intelligence, intelligence quotient, and learning styles predict academic performance among students in mechanical engineering. For this purpose, forty-two students from the Department of Mechanical Engineering of the University of Porto were recruited among the available population. Particip...
This study investigated the possible causes behind the significant growth of the number of Iranians in Portugal. By considering the published reports, it was found that a major part of the Iranians are students or working in academic fields. A question that arises is why the number of Iranian students at higher educational levels or later academic...
This study aimed to investigate whether Acceptance and Commitment Therapy (ACT) leads to reduced anxiety and depression symptoms in health care workers during the pressure of the covid-19 pandemic. ACT has been developed to improve psychological flexibility, and it has been used on a wide range of psychological disorders. For this study, 40 health...
We investigated whether virtual tool-use training combined with vibro-tactile feedback on the thumb
and index finger changes localization of tactile stimuli on those fingers as well as associated cortical
processing. Thirty young adult participants learned controlling a virtual gripper in augmented reality
to grasp virtual objects at various loc...
We examined whether resting-state and task-related EEG power over centro-parietal and frontal brain
regions were changed by virtual tool-use training and whether such changes were associated with
learning, sense of agency and ownership. Thirty-four young adult participants learned to use a virtual
tool for grasping an object in augmented reality...
As insomnia is recognized as a globally prevalent mental disorder with a high comorbidity rate, attempts to cure insomnia have been increasing. Primary insomnia is not attributed to other medical conditions or substance usage but may be due to impaired brain network and dysregulated brain activities. Normally, a bottom-up thalamocortical pathway is...
Autism Spectrum Disorder is a neurological and developmental disorder that starts early in infancy and lasts throughout a person's life affecting information flow in the brain leading to secondary problems for the patient. Early detection of ASD is vital in enhancing the efficiency of the treatment. Current diagnostic approaches for autism are time...
Autism Spectrum Disorder is a neurological and developmental disorder that starts early in infancy and lasts throughout a person’s life affecting information flow in the brain leading to secondary problems for the patient. Early detection of ASD is vital in enhancing the efficiency of the treatment. Current diagnostic approaches for autism are time...
From resting-state Electroencephalography (EEG) signals, two Attention Deficit Hyperactivity Disorder (ADHD) detectors were created. One of the detectors contained extreme gradient boosting (XGB), which used polynomial combinations of delta and theta relative power band (ID-2), and the other detector was created using a visual representation of the...
Miller et al. (2014) described altered arm representation and body schema after training to use a mechanical gripper for grasping distant objects. We examined whether similar training with a virtual tool in augmented reality (AR) would have comparable effects. Thirty young adults learned controlling a virtual gripper to grasp virtual objects at var...
High-density electroencephalogram (HD EEG) was used to longitudinally investigate developmental trends in evoked and induced electrical activity as a function of visual motion perception in full-term and preterm infants during the first year of life. The infants were presented with the visual motion paradigm of "looming", where a virtual visual obj...
Perception of structured optic flow and random visual motion in infants and adults using high-density EEG
Structured forwards optic flow, reversed optic flow, and non-structured random visual motion was presented to infants at 3-4 months and 11-12 months to longitudinally study brain electrical activity by recording electroencephalogram (EEG). Temporal spectral evolution (TSE, time-dependent amplitude changes) was analyzed from artifact-free EEG data r...
The main purpose of this study is to evaluate the effectiveness of neurofeedback on creating alternative brain states that could strengthen sustained attention, reaction time and working memory in elementary school students in ordinary schools. This research is a pre/post-test with control group experimental design. Sample selection was done by ran...
The aim of present study was to investigate the effects of neurofeedback training on the students' emotional self-regulation. This research is a pre/post-test with control group experimental design. Sample selection was done by randomly selection of 30 students from University of Esfahan, and then randomly distributed by two groups (experimental an...
This study designed to examine and compare effect of neurofeeback training and medication to improve ADHD symptoms. This study recruited 36 primary school students that diagnosed and refereed from specialist to receive treatment to improve their ADHD symptoms. This experiment was with pre/post-test employed neuropsychological assessments. All the p...
The aim of the present study was to investigate the effect of transcranial direct current stimulation (tDCS) to reduce frequency of epileptic attack in cohort of adults referred from neurologists (2012-2013). This study was recruited 11 adults with focal epilepsy that diagnosed by neurologists and asked them to fill consent form after receiving nec...
The aim of the present study was to investigate the effect of neurofeedback training to improve grand mal epilepsy (Tonic-Clonic). The participants consisted of 30 patients (8 women & 22 male) who had grand mal epileptic disorder that confirmed by neurologist. Participants were randomly distributed to experimental and control group. The experimenta...
چکيده
هدف از پژوهش حاضر بررسي تأثیر روش آموزشي نوروفیدبک بر تقویت توانایي حل مسئله و عملکرد تحصیلي دانش آموزان دوره ابتدایي بود. بدین منظور از طرح آزمایشي پیش آزمون با گروه کنترل استفاده گردید. جامعه آماری پژوهش ، کلیه دانش آموزان ابتدایي شهر اصفهان بودند. به منظور انتخاب نمونه ابتدا دو دبستان (دخترانه و پسرانه) به روش تصادفي انتخاب و سپس از بین دا...
Aim and Background: The present study aimed to evaluate the effect of neurofeedback training on reducing anxiety in people who attend a psychology clinic in Isfahan.Methods and Materials: Eighteen persons were randomly divided into control and test groups. The mean age of participants was 34.44. Then, before and after the training they were evaluat...
The aim of this study was to investigate the effect of rational emotive behavioral therapy (REBT) to improve mood states and irrational beliefs among drug-abused adolescents. This study was experimental design with pre/post-test that recruited 20 participants diagnosed according to the DSM_IV_TR, and referred from psychiatrist to receive Methadone...
هدف از پژوهش حاضر بررسی تأثیر روش آموزشی نوروفیدبک بر تقویت توانایی حل مسئله و عملکرد تحصیلی دانشآموزان دوره ابتدایی بود. بدین منظور از طرح آزمایشی پیشآزمون با گروه کنترل استفاده گردید. جامعه آماری پژوهش، کلیه دانشآموزان ابتدایی شهر اصفهان بودند. به منظور انتخاب نمونه ابتدا دو دبستان (دخترانه و پسرانه) به روش تصادفی انتخاب و سپس از بین دانشآموز...