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Spurious correlations
by ptq1＠psych.york.ac.uk 16 Jan '09

16 Jan '09

This looks like a very useful place to look for stuff about the recent controversy http://www.mindhacks.com/blog/2009/01/voodoo_accusations_f.html Philip.

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External Speakers Seminar-University of Leeds-Psychology
by Ekaterini Klepousniotou 16 Jan '09

16 Jan '09

Dear colleagues, Please find attached the list with the External Speakers for this semester at the Institute of Psychological Sciences (IPS) at the University of Leeds. Our External Speakers Seminar series takes place on Wednesdays at 16:00 in the IPS in Room G.17 and is followed by a wine reception at the foyer of the Insitute. You are all welcome to attend any talks that are of interest to you. All the best, Katerina ****************************************************** Dr. Ekaterini Klepousniotou Lecturer in Cognitive Neuroscience & Neuropsychology Institute of Psychological Sciences University of Leeds Leeds LS2 9JT UK Tel: +44-(0)113-343 5716 Fax: +44-(0)113-343 5749

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[Fwd: YNiC seminar 15th January] - today
by Gary Green 15 Jan '09

15 Jan '09

Dear Users Today, David Halliday from the Department of Electronics will give a talk. David's talk will be followed by a YNiC project presentation by Philip Quinlan and Nikos Andreadis titled "Switching tasks and anticipating switching tasks: what is the brain doing?". These events will take place at YNiC from 4-5 pm. The title of David's talk is "The Noisy Brain – An introduction to time and frequency domain signal processing techniques for neurophysiological data". http://www.elec.york.ac.uk/staff/dh20.html Abstract: A common feature of neurophysiological signals is the presence of noise, i.e. the signals have the appearance of random processes. In addition, records taken under similar conditions do not have a similar appearance. Analysis of such data therefore requires the use of some form of statistical analysis. For example sample records of EEG recorded from different scalp locations may not look alike, but a statistical analysis may demonstrate that the records share a common underlying rhythm. The field of time-series analysis provides a conceptual and mathematical framework within which random signals, including neurophysiological signals, can be analysed. Two approaches are traditionally used in the analysis of time series – these are the time and frequency domain approaches. The frequency domain approach is generally based on Fourier methods. In the case of two or more simultaneously recorded signals, an important concept is that of correlation, the objective being to assess to what extent the activity in one signal is correlated with that in a second signal. A key frequency domain parameter in this context is the coherence function, which provides a normative linear measure of association between two time series, as a function of frequency. The talk will consider time and frequency domain analyses of neurophysiological signals, including coherence functions. These will be developed within a unified framework where time and frequency domain techniques sit naturally alongside each other, and can be used as complementary forms of analysis. A number of extensions will be discussed, which look at alternative measures of correlation (phase synchronization, causal measures); deal with time dependency (Wavelets, Kalman filtering) and non linearities (higher order spectra). Everyone is welcome to attend. Best wishes Rebecca -- ************************************************************************ Dr. Rebecca E. Millman Science Liaison Officer York Neuroimaging Centre The Biocentre York Science Park Heslington YO10 5DG Tel: +44 (0) 1904 567614 Fax: +44 (0) 1904 435356 -- ynic-users mailing list ynic-users(a)ynic.york.ac.uk https://www.ynic.york.ac.uk/mailman/listinfo/ynic-users

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Seminar
by Gary Green 13 Jan '09

13 Jan '09

Karl Friston will be talking at a seminar in the Computing Science Department on the 11th of February at 2pm in CS103 The title is "A new sort of filter" Full details can be found at http://www.cs.york.ac.uk/seminars/09Spring/Friston.php -- Gary Green York Neuroimaging Centre The Biocentre York Science Park Innovation Way Heslington York YO10 5DG http://www.ynic.york.ac.uk tel. 01904 435349 fax 01904 435356 mobile 07986 778954

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YNiC seminar 15th January
by rem 12 Jan '09

12 Jan '09

Dear Users This week David Halliday from the Department of Electronics will give a talk. David's talk will be followed by a YNiC project presentation by Philip Quinlan and Nikos Andreadis titled "Switching tasks and anticipating switching tasks: what is the brain doing?". These events will take place at YNiC from 4-5 pm. The title of David's talk is "The Noisy Brain – An introduction to time and frequency domain signal processing techniques for neurophysiological data". http://www.elec.york.ac.uk/staff/dh20.html Abstract: A common feature of neurophysiological signals is the presence of noise, i.e. the signals have the appearance of random processes. In addition, records taken under similar conditions do not have a similar appearance. Analysis of such data therefore requires the use of some form of statistical analysis. For example sample records of EEG recorded from different scalp locations may not look alike, but a statistical analysis may demonstrate that the records share a common underlying rhythm. The field of time-series analysis provides a conceptual and mathematical framework within which random signals, including neurophysiological signals, can be analysed. Two approaches are traditionally used in the analysis of time series – these are the time and frequency domain approaches. The frequency domain approach is generally based on Fourier methods. In the case of two or more simultaneously recorded signals, an important concept is that of correlation, the objective being to assess to what extent the activity in one signal is correlated with that in a second signal. A key frequency domain parameter in this context is the coherence function, which provides a normative linear measure of association between two time series, as a function of frequency. The talk will consider time and frequency domain analyses of neurophysiological signals, including coherence functions. These will be developed within a unified framework where time and frequency domain techniques sit naturally alongside each other, and can be used as complementary forms of analysis. A number of extensions will be discussed, which look at alternative measures of correlation (phase synchronization, causal measures); deal with time dependency (Wavelets, Kalman filtering) and non linearities (higher order spectra). Everyone is welcome to attend. Best wishes Rebecca -- ************************************************************************ Dr. Rebecca E. Millman Science Liaison Officer York Neuroimaging Centre The Biocentre York Science Park Heslington YO10 5DG Tel: +44 (0) 1904 567614 Fax: +44 (0) 1904 435356

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[Fwd: HBM 2009 Call For Abstracts Reminder]
by Gary Green 30 Dec '08

30 Dec '08

Apologies if you have already been sent this The Abstract Submission site is open for the 15th Annual Meeting of the Organization for Human Brain Mapping to be held in San Francisco, CA, June 18-22, 2009. Please note that the deadline is *January 11th, 2009 at 11:59 PM CST USA*. Please click here <http://www.llmsi.com/index.php?cid=1425129&forward=2670&curlid=11646> to submit an abstract. Though you are not required to register for the meeting prior to submitting an abstract, the presenter of the abstract must register for the meeting. To take advantage of the lowest registration fee, register online at www.humanbrainmapping.org/sanfrancisco <http://www.llmsi.com/index.php?cid=1425129&forward=2543&curlid=3>_2009_ by March, 15, 2009. Watch for an email announcing the opening of the registration site in January. The Program Committee (PC) of the Organization for Human Brain Mapping's goal is to keep rejection of abstracts low because it wishes to be inclusive. The policy for HBM 2009 will be to reject abstracts that are unethical, incomplete, or contain no data. Statements such as "results will be presented" are not acceptable. The PC also wants the number of posters to be at a level that will provide a positive viewing experience for the attendees. When submitting abstracts for HBM 2009, please consider whether multiple abstracts are truly necessary or if the data you are presenting could be accomplished via submission of one abstract. Thank you for assisting us in increasing the quality of the OHBM Annual Meeting. We look forward to welcoming you to HBM 2009. You can count on the traditional OHBM combination of exciting scientific programs and social events. Do plan to give yourself a little extra time to experience the city of San Francisco. This city by the sea is a bustling metropolis made famous by its most popular landmark, the Golden Gate Bridge. You won't be disappointed. The city has something for everyone. There is an excellent mix of art galleries, attractions, museums, quaint neighborhoods, unique shops, and many ethnic restaurants. For more information, please visit the conference website at www.humanbrainmapping.org/sanfrancisco <http://www.llmsi.com/index.php?cid=1425129&forward=2543&curlid=3>_2009_. The website will continually be updated as more information becomes available. If you have any questions, please contact us at info(a)humanbrainmapping.org <mailto:info@humanbrainmapping.org>. If you encounter issues with paying the abstract submission fee online or other technical glitches, please contact tech support at help(a)spltrak.com <mailto:help@spltrak.com>. Sincerely, Pietro Pietrini, Program Committee Susan Bookheimer, Local Organizing Chair Mark D'Esposito, Chair, OHBM <http://www.llmsi.com/index.php?cid=1425129&src=broadcastemail&optoutall=586…> -- Gary Green York Neuroimaging Centre The Biocentre York Science Park Innovation Way Heslington York YO10 5DG http://www.ynic.york.ac.uk tel. 01904 435349 fax 01904 435356 mobile 07986 778954

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New publication from YNiC and York NMR Centre
by Gary Green 29 Dec '08

29 Dec '08

Dear colleagues I am pleased to announce that the following paper has just been published Para-Hydrogen Induced Polarization without Incorporation of Para-Hydrogen into the Analyte Kevin D. Atkinson, Michael J. Cowley, Simon B. Duckett, Paul I. P. Elliott, Gary G. R. Green, Joaquın Lopez-Serrano, Iman G. Khazal, and Adrian C. Whitwood in Inorganic Chemistry (2009) the preprint can be read on the web from http://pubs.acs.org/doi/abs/10.1021/ic8020029 -- Gary Green York Neuroimaging Centre The Biocentre York Science Park Innovation Way Heslington York YO10 5DG http://www.ynic.york.ac.uk tel. 01904 435349 fax 01904 435356 mobile 07986 778954

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MR/PET conference, Chicago Deadline- January 14]
by awe1＠psych.york.ac.uk 19 Dec '08

19 Dec '08

---------------------------- Original Message ---------------------------- Subject: Abstract Submission Deadline- January 14 From: "BRAIN 2009" <BRAIN_2009(a)mail.vresp.com> Date: Wed, December 17, 2008 3:32 pm To: a.ellis(a)psych.york.ac.uk -------------------------------------------------------------------------- If you can not read this e-mail, click or copy this link: http://cts.vresp.com/c/?KenesInternationalIS/47498b2c69/1e6b94075d/2b16c431… ______________________________________________________________________ If you no longer wish to receive these emails, please reply to this message with "Unsubscribe" in the subject line or simply click on the following link: http://cts.vresp.com/u?47498b2c69/1e6b94075d/4c7f0bd ______________________________________________________________________ This message was sent by BRAIN 2009 using VerticalResponse Kenes International 1-3 Rue de Chantepolet P.O.Box 1726 Geneva, Geneve CH-1211 SWITZERLAND Read the VerticalResponse marketing policy: http://www.verticalresponse.com/content/pm_policy.html

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Cortical plasticity: Annual meeting of the British Association for
by awe1＠psych.york.ac.uk 19 Dec '08

19 Dec '08

From: AHPD Departmental Contacts [mailto:AHPD-DEPTS@JISCMAIL.AC.UK] On Behalf Of John Draper Sent: 17 December 2008 15:10 To: AHPD-DEPTS(a)JISCMAIL.AC.UK Subject: FW: Call for Symposia: Annual meeting of the British Association for Cognitive Neuroscience Dear colleague, Re: Annual meeting of the British Association for Cognitive Neuroscience (BACN) I would like to invite you to submit proposals for symposia for our 2009 meeting, to be held from 21st - 23rd September at the UCL Institute of Child Health, London. The general theme of this year's meeting is 'cortical plasticity' - a broad theme, but one that is critical for understanding cognition at a number of levels: from sensory learning to language and memory. It also requires convergent methodologies and consequently we encourage you to represent the variety of modern neuroscience methods to address questions such as cognitive development, higher brain function or recovery from injury. We are also open to any alternative suggestions. We are a relatively young society that is keen to support scientists at the beginning of their career. We therefore provide several bursaries for graduate students and a poster prize for exceptional undergraduate projects, the best of whom will be invited to give a platform presentation. There will be opportunity to interact with world-leading neuroscientists from nearby UCL-based neuroscience centres (e.g. the Wellcome Trust Centre for Neuroimaging and the Institute for Cognitive Neuroscience). We also promise a lively social programme - something BACN is well renowned for! Please submit your symposium proposals by the 1st February 2009 directly to me (T.Baldeweg(a)ich.ucl.ac.uk ). Please include a provisional list of speakers and titles. Symposia usually last from 1.5h to 2.5h. Free registration for participants and contributions towards travel expenses are available. I look forward to hearing from you soon. Torsten Baldeweg Chairman BACN PS: For those of you who missed our last meeting in Swansea, a summary is published by ACNR ( <http://www.acnr.co.uk/ND08/ACNRND08_conference.pdf> http://www.acnr.co.uk/ND08/ACNRND08_conference.pdf ). The programme can be found under ( <http://psy.swan.ac.uk/bacn/conference/> http://psy.swan.ac.uk/bacn/conference/). John Draper Division of Psychology & Language Sciences UCL Gower Street London WC1E 6BT tel: 020 7679 5338 fax: 020 7436 4276 j.draper(a)ucl.ac.uk http://www.psychol.ucl.ac.uk/john.draper/john.html

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Induced and evoked responses in MEG
by awe1＠psych.york.ac.uk 16 Dec '08

16 Dec '08

Dear all The first slide in the attached Powerpoint presentation was generated by Piers for a paper based on data gathered at Aston. The stimuli were written words. The figure shows the time-frequency plots for virtual electrodes inserted at 4 different sites in the brain, with power represented in the colour. There are 3 plots for each site showing evoked power (left), total power (middle) and induced power (right). These figures were generated in Fieldtrip where the time-frequency plots are computed with respect to a baseline. Piers has added a couple of slides which shows the steps in Fieldtrip that he used. The left middle occipital gyrus (MOGl) site is closest to primary visual cortex where the words first arrive. You will notice that the power there is mostly evoked and that the induced component is small. The same is true at the left mid fusiform gyrus (= the 'visual word form area'). Contrast that with the left and right inferior frontal gyri (IFGl), which are further from primary visual cortex. There is some evoked power at those sites, but most of the total power is induced. It seems to me that the lessons could be: 1. If you plot total power, do not automatically assume that it will be mostly induced. There are conditions and sites (close to primary sensory cortex?) where the total power may be mostly evoked. 2. Do not plot total power and call it "induced". It may not be. 3. It could be that the more synapses a response passes through, the more the power shifts from evoked to induced. That could be because different stimuli complete the passage from early to late sites at different rates in different participants with the result that the response gets jittered in time, disappears in the evoked averaging, and appears instead in the induced response. Induced responses may not always be qualitatively different from from evoked responses - they may simply be smeared out in time. (Note: This is not to deny the existence of induced responses which are NOT the result of stereotypical waveforms + jitter, but rather represents increased power in several oscillators within a given time period.) 4. It would be a good thing if the VE tools we develop in YNiC for generating time-frequency plots were capable of distinguishing evoked from induced responses and plotting them separately. Please discuss in rare pre-Christmas moments of sobriety. Andy

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