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Oct 27, 2012

Using Activity-Related Behavioural Features towards More Effective Automatic Stress Detection

Giakoumis D, Drosou A, Cipresso P, Tzovaras D, Hassapis G, Gaggioli A, Riva G.

PLoS One. 2012;7(9):e43571. doi: 10.1371/journal.pone.0043571. Epub 2012 Sep 19

This paper introduces activity-related behavioural features that can be automatically extracted from a computer system, with the aim to increase the effectiveness of automatic stress detection. The proposed features are based on processing of appropriate video and accelerometer recordings taken from the monitored subjects. For the purposes of the present study, an experiment was conducted that utilized a stress-induction protocol based on the stroop colour word test. Video, accelerometer and biosignal (Electrocardiogram and Galvanic Skin Response) recordings were collected from nineteen participants. Then, an explorative study was conducted by following a methodology mainly based on spatiotemporal descriptors (Motion History Images) that are extracted from video sequences. A large set of activity-related behavioural features, potentially useful for automatic stress detection, were proposed and examined. Experimental evaluation showed that several of these behavioural features significantly correlate to self-reported stress. Moreover, it was found that the use of the proposed features can significantly enhance the performance of typical automatic stress detection systems, commonly based on biosignal processing.

Full paper available here

Aug 04, 2012

The Virtual Brain

The Virtual Brain project promises "to deliver the first open simulation of the human brain based on individual large-scale connectivity", by "employing novel concepts from neuroscience, effectively reducing the complexity of the brain simulation while still keeping it sufficiently realistic".

The Virtual Brain team includes well-recognized neuroscientists from all over the world. In the video below, Dr. Randy McIntosh explains what the project is about.

First teaser release of The Virtual Brain software suite is available for download – for Windows, Mac and Linux: http://thevirtualbrain.org/

Apr 20, 2012

Mental workload during brain-computer interface training

Mental workload during brain-computer interface training.

Ergonomics. 2012 Apr 16;

Authors: Felton EA, Williams JC, Vanderheiden GC, Radwin RG

Abstract. It is not well understood how people perceive the difficulty of performing brain-computer interface (BCI) tasks, which specific aspects of mental workload contribute the most, and whether there is a difference in perceived workload between participants who are able-bodied and disabled. This study evaluated mental workload using the NASA Task Load Index (TLX), a multi-dimensional rating procedure with six subscales: Mental Demands, Physical Demands, Temporal Demands, Performance, Effort, and Frustration. Able-bodied and motor disabled participants completed the survey after performing EEG-based BCI Fitts' law target acquisition and phrase spelling tasks. The NASA-TLX scores were similar for able-bodied and disabled participants. For example, overall workload scores (range 0-100) for 1D horizontal tasks were 48.5 (SD = 17.7) and 46.6 (SD 10.3), respectively. The TLX can be used to inform the design of BCIs that will have greater usability by evaluating subjective workload between BCI tasks, participant groups, and control modalities. Practitioner Summary: Mental workload of brain-computer interfaces (BCI) can be evaluated with the NASA Task Load Index (TLX). The TLX is an effective tool for comparing subjective workload between BCI tasks, participant groups (able-bodied and disabled), and control modalities. The data can inform the design of BCIs that will have greater usability.

Apr 04, 2012

Microsoft Academic Search: nice Science 2.0 service, wrong H-index calculation!

Yesterday I came across Microsoft Academic Search, supposingly the main contender of Google Scholar Citations.

Although the service provides a plenty of interesting and useful features (including customizable author profile pages, a visual explorer, open API and many others), I don't like AT ALL the fact that it publishes an author's profile, including publication's profile and list, without asking the permission to do that (as Google Scholar does).

But what is even worse, is that the data published are, in most cases, incomplete or incorrect (or at least, they seemed incorrect for most of the authors that I included in my search). And this is not limited to the list of the list of publications (which could be understandable) but it also affects the calculation of the H-index (which measures both the productivity and impact of a scholar, based on the set of the author's most cited papers and the number of citations that they have received in other publications).

Since in the last few years the H-index has become critical to measure researcher's importance, displaying an inaccurate value of this index on a author's profile is NOT appropriate. While Microsoft may object that its service is open for users to edit the content (actually, the Help Center informs that "If you find any wrong or out-of-date information about author profile, publication profile or author publication list, you can make corrections or updates directly online") my point is that you CANNOT FORCE someone to correct otherwise potentially wrong data concerning scientific productivity.

One could even suspect that Microsoft purposefully underestimates the H-index to encourage users to join the service in order to edit their data. I do not think that this is the case, but at the same time, I cannot exclude this possibility.

Anyway, these are my two cents and I welcome your comments.

p.s. Interested in other Science 2.0 topics? Join us on Linkedin 

Mar 31, 2012

Barriers to and mediators of brain-computer interface user acceptance

Barriers to and mediators of brain-computer interface user acceptance: focus group findings.

Ergonomics. 2012 Mar 29

Authors: Blain-Moraes S, Schaff R, Gruis KL, Huggins JE, Wren PA

Abstract. Brain-computer interfaces (BCI) are designed to enable individuals with severe motor impairments such as amyotrophic lateral sclerosis (ALS) to communicate and control their environment. A focus group was conducted with individuals with ALS (n=8) and their caregivers (n=9) to determine the barriers to and mediators of BCI acceptance in this population. Two key categories emerged: personal factors and relational factors. Personal factors, which included physical, physiological and psychological concerns, were less important to participants than relational factors, which included corporeal, technological and social relations with the BCI. The importance of these relational factors was analysed with respect to published literature on actor-network theory (ANT) and disability, and concepts of voicelessness and personhood. Future directions for BCI research are recommended based on the emergent focus group themes. Practitioner Summary: This manuscript explores human factor issues involved in designing and evaluating brain-computer interface (BCI) systems for users with severe motor disabilities. Using participatory research paradigms and qualitative methods, this work draws attention to personal and relational factors that act as barriers to, or mediators of, user acceptance of this technology.

May 21, 2011

Science 2.0

The emergence of Web 2.0 has resulted in a number of new communication and participation tools. Wiki, rss, weblogs and social networks have turned the Internet into a writable platform, where the user acts as a “prosumer”, that is a consumer and a producer of information. For many, however, social computing is not just a new phase in the evolution of ICT, but a new model of generation and diffusion of knowledge, which has a potentially transformative impact on social and cultural processes. The rapid and pervasive diffusion of social computing requires organizations and institutions to face new challenges and rethink their modus operandi.

Science, as any other cultural enterprise, is likely to be deeply affected by the social media revolution. This is not surprising, considering the close relationship that has always existed between the development of science and the development of the Internet. When Tim Berners Lee, a researcher of the European Particle Physics Lab (CERN) in Switzerland, created the networked hypertext, his main goal was to develop an effective solution to facilitate communication among members of the high-energy physics community, who were located in several countries. In his original proposal to CERN’s management written in March 1989, Berners-Lee suggestedthe integration of a hypertext system with existing data, so as to provide a universal system, and to achieve critical usefulness at an early stage”.

Since those early days of its development, of course, the Web has changed enormously, offering researchers opportunities that are probably beyond the imagination of its inventor. Today’s social media tools and services have the potential to radically transform the way science is conducted, financed and communicated. This “Science 2.0 revolution” unfolds along three major directions: open collaboration, open data and open publication/access.

Open collaboration refers to the possibility of using the tools provided by social networks, wikis and forums to share information and know-how. This strategy allows researchers to exchange protocols, techniques, experimental procedures and find solutions to common issues. Open collaboration networks provide a powerful collaboration and learning environment, where experts from different disciplines can join their forces to develop new projects, write grant proposals, plan studies etc.

The second trend, open data, concerns the publication and re-use of scientific data such as maps, genomes, chemical compounds, medical etc. without price or permission. Although the concept is not new, it has gained momentum in recent years thanks to the raising popularity of social computing. Advocates of this approach believe that the public availability and reusability of research data not only reduce wasteful duplication of effort, but also permit faster progress in science, since different teams can use the same data to test a variety of hypotheses. Recently, prominent exponents of the open data movement have authored a set of principles – the “Panton Principles” aimed at articulating a view of what best practice should be with respect to data publication for science. A key goal of these principles is the elimination of uncertainty for researchers who wish to use the data about what exactly they are allowed to do with it.

The third emerging trend in Science 2.0, open access, concerns the provision of unrestricted online access to articles published in scholarly journals. Supporters of open access argue that this approach brings researchers increased visibility, usage and impact for their work. On the other hand, critics of OA do not believe that this model is economically sustainable, and express concerns about quality control. Another criticism is that since some OA journals require payment on behalf of the author, this could generate conflicts of interest and have a negative impact on the perceived neutrality of peer review, as there would be a financial incentive for journals to publish more articles.

Wikis, blogs and the other Web 2.0 technologies are paving a way towards providing new means of collaboration, education and communication for researchers. However, the successful adoption of this approach depends heavily on the ability to create a deep understanding of scientist’s current practices, needs and expectations.

More to explore:

  • Science 2.0: Science 2.0 is an open professional network on Linkedin aimed at connecting researchers, consultants and companies and institutions interested in the impact of social media on science and technology.
  • Research Gate:ResearchGate is a community for researchers in the science and technology fields that includes advanced semantic search capabilities. Launched in 2008 by Ijad Madisch, Horst Fickenscher and Sören Hofmayer, this “Facebook for scientists” has gathered a user base of more than 700.000 researchers worldwide.
  • Labmeeting: Labmeeting, founded by Mark Kaganovich, Jeremy England, Dan Kaganovich, and Joseph Perla, is an online platform for scientists. It is designed as a document-sharing service for scientific papers and protocols. Members can upload their papers in PDF form, organize them, search them, and share them with other lab members.
  • Openwetware: Created by graduate students at MIT in 2005, OpenWetWare is a wiki whose mission is "to support open research, education, publication, and discussion in biological sciences and engineering." All content is available under free content licenses.
  • Many Eyes: Many Eyes is data-sharing site from the Visual Communication Lab at IBM. The platform allows users to upload data and then produce graphic representations for others to view and comment upon. 
  • Open Clinica: is an open source platform for clinical research, including electronic data capture (EDC) and clinical data management capabilities.
  • Directory of Open Access Journals: DOAJ covers free, full text scientific and scholarly journals with different subjects and languages. The current directory (as of February 2011) includes 6100 journals and 506687 articles.


13:18 Posted in Research tools | Permalink | Comments (0)

Mar 03, 2011

Online predictive tools for mental illness: The OPTIMI Project

OPTIMI is a r&d project funded by the European Commission under funded by the European Union's 7th Framework Programme "Personal Health Systems - Mental Health" .

The project has two key goals goals: a) the development of new tools to monitor coping behavior in individuals exposed to high levels of stress; b) the development of online interventions to improve this behavior and reduce the incidence of depression.

To achieve its first goal, OPTIMI will develop technology-based tools to monitor the physiological state and the cognitive, motor and verbal behavior of high risk individuals over an extended period of time and to detect changes associated with stress, poor coping and depression.  

A series of “calibration trials” will allow the project will test a broad range of technologies. These will include wearable EEG and ECG sensors to detect subjects’ physiological and cognitive state, accelerometers to characterize their physical activity, and voice analysis to detect signs of depression. These automated measurements will be complemented with electronic diaries, in which subjects report their own behaviors and the stressful situations to which they are exposed. Further, the project will use machine learning to identify patterns in the behavioral and physiological data that predict the findings from the psychologist and the corticol measurements.

Although the project's objectives are very ambitious, OPTIMI represents one of the most advanced  initiatives in the field of Positive Technology, so I am very excited to follow its progresses and see how far it can go.


Mar 02, 2011

The Key to Unlocking the Virtual Body: Virtual Reality in the Treatment of Obesity and Eating Disorders

The Key to Unlocking the Virtual Body: Virtual Reality in the Treatment of Obesity and Eating Disorders

Giuseppe Riva, Journal of Diabetes Science and Technology, Volume 5, Issue 2, March 2011

Obesity and eating disorders are usually considered unrelated problems with different causes. However, various studies identify unhealthful weight-control behaviors (fasting, vomiting, or laxative abuse), induced by a negative experience of the body, as the common antecedents of both obesity and eating disorders. But how might negative body image—common to most adolescents, not only to medical patients—be behind the development of obesity and eating disorders? In this paper, I review the “allocentric lock theory” of negative body image as the possible antecedent of both obesity and eating disorders. Evidence from psychology and neuroscience indicates that our bodily experience involves the integration of different sensory inputs within two different reference frames: egocentric (first-person experience) and allocentric (third-person experience). Even though functional relations between these two frames are usually limited, they influence each other during the interaction between long- and short-term memory processes in spatial cognition. If this process is impaired either through exogenous (e.g., stress) or endogenous causes, the egocentric sensory inputs are unable to update the contents of the stored allocentric representation of the body. In other words, these patients are locked in an allocentric (observer view) negative image of their body, which their sensory inputs are no longer able to update even after a demanding diet and a significant weight loss. This article discusses the possible role of virtual reality in addressing this problem within an integrated treatment approach based on the allocentric lock theory.

Dec 27, 2010

Metaverse Creativity

Intellect has announced the publication of the groundbreaking new journal Metaverse Creativity, which is the first refereed journal focusing on the examination of creativity in user-defined online virtual worlds such as Second Life.

While such creative activity includes artistic activity, this definition should in no way be limited to artistic output alone but should encompass the output of the various disciplines of design – such as fashion and object design, landscaping and virtual architecture – that are currently all amply manifest in Second Life.

Creativity in a metaverse manifests under unique conditions and parameters that are engendered by the virtual environment itself and it is intrinsically related to these in its very act of realization. Thus metaverse creativity cannot be separated from the underlying Metanomic system (metaverse economy), the legal issues of ownership and copyright, the very geography and related atmospheric/lighting conditions upon which the output is rendered, or the underlying computational system which generates this.

The inaugural issue includes a fascinating editorial by Elif Ayiter and Yacov Sharir.

For a complete list of articles with accompanying abstracts visit: http://www.atypon-link.com/INT/toc/mecr/1/1.

Issue 1 is FREE to view online: http://www.atypon-link.com/INT/toc/mecr/1/1

To subscribe please visit the journal's page for details: http://bit.ly/epvHg3

A Call for Papers is available here

Oct 19, 2010

Neurocognitive systems related to real-world prospective memory

Neurocognitive systems related to real-world prospective memory.

PLoS One. 2010;5(10):

Authors: Kalpouzos G, Eriksson J, Sjölie D, Molin J, Nyberg L

BACKGROUND: Prospective memory (PM) denotes the ability to remember to perform actions in the future. It has been argued that standard laboratory paradigms fail to capture core aspects of PM. METHODOLOGY/PRINCIPAL FINDINGS: We combined functional MRI, virtual reality, eye-tracking and verbal reports to explore the dynamic allocation of neurocognitive processes during a naturalistic PM task where individuals performed errands in a realistic model of their residential town. Based on eye movement data and verbal reports, we modeled PM as an iterative loop of five sustained and transient phases: intention maintenance before target detection (TD), TD, intention maintenance after TD, action, and switching, the latter representing the activation of a new intention in mind. The fMRI analyses revealed continuous engagement of a top-down fronto-parietal network throughout the entire task, likely subserving goal maintenance in mind. In addition, a shift was observed from a perceptual (occipital) system while searching for places to go, to a mnemonic (temporo-parietal, fronto-hippocampal) system for remembering what actions to perform after TD. Updating of the top-down fronto-parietal network occurred at both TD and switching, the latter likely also being characterized by frontopolar activity. CONCLUSION/SIGNIFICANCE: Taken together, these findings show how brain systems complementary interact during real-world PM, and support a more complete model of PM that can be applied to naturalistic PM tasks and that we named PROspective MEmory DYnamic (PROMEDY) model because of its dynamics on both multi-phase iteration and the interactions of distinct neurocognitive networks.

Aug 24, 2010

LHC rap

The Large Hadron Collider, the world's largest and highest-energy particle accelerator, promises to revolutionize our knowledge of the universe and advance our understanding of the most fundamental laws of nature.


But if you are not very good at quantum physics, do not worry: you can still get an explanation in RAP format of what the LHC is all about.

A 'sound' explanation, indeed!

Feb 13, 2010

The Limits of Agency in Walking Humans

The Limits of Agency in Walking Humans.

Neuropsychologia. 2010 Feb 6;

Authors: Kannape OA, Schwabe L, Tadi T, Blanke O

An important principle of human ethics is that individuals are not responsible for actions performed when unconscious. Recent research found that the generation of an action and the building of a conscious experience of that action (agency) are distinct processes and crucial mechanisms for self-consciousness. Yet, previous agency studies have focussed on actions of a finger or hand. Here, we investigate how agents consciously monitor actions of the entire body in space during locomotion. This was motivated by previous work revealing that (1) a fundamental aspect of self-consciousness concerns a single and coherent representation of the entire spatially situated body and (2) clinical instances of human behaviour without consciousness occur in rare neurological conditions such as sleepwalking or epileptic nocturnal wandering. Merging techniques from virtual reality, full-body tracking, and cognitive science of conscious action monitoring, we report experimental data about consciousness during locomotion in healthy participants. We find that agents consciously monitor the location of their entire body and its locomotion only with low precision and report that while precision remains low it can be systematically modulated in several experimental conditions. This shows that conscious action monitoring in locomoting agents can be studied in a fine-grained manner. We argue that the study of the mechanisms of agency for a person's full body may help to refine our scientific criteria of selfhood and discuss sleepwalking and related conditions as alterations in neural systems encoding motor awareness in walking humans.

Feb 04, 2010

MedlinePlus Now Available for Mobile Phones

From the press release:

The National Library of Medicine's Mobile Medline Plus builds on the NLM's MedlinePlus Internet service, which provides authoritative consumer health information to over 10 million visitors per month. These visitors access MedlinePlus (http://medlineplus.gov) from throughout the United States as well many other countries, and use desktop computers, laptops and even mobile devices to get there.

Mobile MedlinePlus is available in English and Spanish (http://m.medlineplus.gov/spanish) and includes a subset of content from the full Web site. It includes summaries for over 800 diseases, wellness topics, the latest health news, an illustrated medical encyclopedia, and information on prescription and over-the-counter medications.

Mobile MedlinePlus can also help you when you're trying to choose an over-the-counter cold medicine at the drug store.

And if you're traveling abroad, you can use Mobile MedlinePlus to learn about safe drinking water.

15:07 Posted in Research tools | Permalink | Comments (0) | Tags: medline, mobile

Jan 09, 2010

Interface Fantasy - A Lacanian Cyborg Ontology

Cyberspace is first and foremost a mental space. Therefore we need to take a psychological approach to understand our experiences in it. In Interface Fantasy, André Nusselder uses the core psychoanalytic notion of fantasy to examine our relationship to computers and digital technology. Lacanian psychoanalysis considers fantasy to be an indispensable "screen" for our interaction with the outside world; Nusselder argues that, at the mental level, computer screens and other human-computer interfaces incorporate this function of fantasy: they mediate the real and the virtual.

Interface Fantasy illuminates our attachment to new media: why we love our devices; why we are fascinated by the images on their screens; and how it is possible that virtual images can provide physical pleasure. Nusselder puts such phenomena as avatars, role playing, cybersex, computer psychotherapy, and Internet addiction in the context of established psychoanalytic theory. The virtual identities we assume in virtual worlds, exemplified best by avatars consisting of both realistic and symbolic self-representations, illustrate the three orders that Lacan uses to analyze human reality: the imaginary, the symbolic, and the real.

Nusselder analyzes our most intimate involvement with information technology—the almost invisible, affective aspects of technology that have the greatest impact on our lives. Interface Fantasy lays the foundation for a new way of thinking that acknowledges the pivotal role of the screen in the current world of information. And it gives an intelligible overview of basic Lacanian principles (including fantasy, language, the virtual, the real, embodiment, and enjoyment) that shows their enormous relevance for understanding the current state of media technology.

Read more at MIT press.

Jan 07, 2010

Why $0.00 is the future of business

In this video, Chris Anderson (chief editor of Wired) explains why giving your products for free is a winning strategy. The "freemium" (free+premium) approach enhances customers' expectations and their involvement in your work. Once you have gained the attention of customers, you can choose other approaches, i.e. selling higher-quality products or proposing better packages, in order to generate revenues.

Dec 12, 2009

A History of Game Controllers Diagram

image by Damien Lopez (via James Burke)

A History of Game Controllers


Oct 29, 2009

Social Media counts

Jul 01, 2009

A virtual reality-based system integrated with fmri to study neural mechanisms of action observation-execution

A virtual reality-based system integrated with fmri to study neural mechanisms of action observation-execution: A proof of concept study.

Restor Neurol Neurosci. 2009;27(3):209-23

Authors: Adamovich SV, August K, Merians A, Tunik E

Purpose: Emerging evidence shows that interactive virtual environments (VEs) may be a promising tool for studying sensorimotor processes and for rehabilitation. However, the potential of VEs to recruit action observation-execution neural networks is largely unknown. For the first time, a functional MRI-compatible virtual reality system (VR) has been developed to provide a window into studying brain-behavior interactions. This system is capable of measuring the complex span of hand-finger movements and simultaneously streaming this kinematic data to control the motion of representations of human hands in virtual reality. Methods: In a blocked fMRI design, thirteen healthy subjects observed, with the intent to imitate (OTI), finger sequences performed by the virtual hand avatar seen in 1st person perspective and animated by pre-recorded kinematic data. Following this, subjects imitated the observed sequence while viewing the virtual hand avatar animated by their own movement in real-time. These blocks were interleaved with rest periods during which subjects viewed static virtual hand avatars and control trials in which the avatars were replaced with moving non-anthropomorphic objects. Results: We show three main findings. First, both observation with intent to imitate and imitation with real-time virtual avatar feedback, were associated with activation in a distributed frontoparietal network typically recruited for observation and execution of real-world actions. Second, we noted a time-variant increase in activation in the left insular cortex for observation with intent to imitate actions performed by the virtual avatar. Third, imitation with virtual avatar feedback (relative to the control condition) was associated with a localized recruitment of the angular gyrus, precuneus, and extrastriate body area, regions which are (along with insular cortex) associated with the sense of agency. Conclusions: Our data suggest that the virtual hand avatars may have served as disembodied training tools in the observation condition and as embodied "extensions" of the subject's own body (pseudo-tools) in the imitation. These data advance our understanding of the brain-behavior interactions when performing actions in VE and have implications in the development of observation- and imitation-based VR rehabilitation paradigms.

Jun 26, 2009

Amazing optical illusion

Optical Illusion: Monspiral

This picture appears to show green and blue spirals, but in fact the apparent green and blue are exactly the same colour.

More about this here and here.

May 06, 2009

Open Source Eye-Tracker

Via Mauro Cherubini's blog

The Gaze Group at the IT University of Copenhagen is developing an open-source eye-tracking application that will provide a low-cost alternative to commercial gaze tracking systems. The ITU Gaze Tracker is video-based and works with any videocamera or a webcam equipped with infrared nightvision

More to explore: San Agustin, J., Skovsgaard, H., Hansen, J. P., and Hansen, D. W. 2009. Low-cost gaze interaction: ready to deliver the promises. In Proceedings of the 27th international Conference Extended Abstracts on Human Factors in Computing Systems (Boston, MA, USA, April 04 - 09, 2009). CHI EA ‘09. ACM, New York, NY, 4453-4458.