[CBIAnnounce] CBI Talk: Bosco Tjan, Monday 2/24 11am

[Jonathan A Winawer]

Bosco Tjan talk in 5 minutes, room 551, Meyer Hall


On Fri, Feb 21, 2014 at 12:34 PM, Ed Vessel <ed.vessel at nyu.edu> wrote:

> CBI Seminar:* Bosco Tjan (U. Southern California)*
>
> Monday, February 24
> 11am - 12pm
> Meyer 551
>
> PLEASE NOTE that this talk is being held on a different day and time than
> the usual CBI seminar timeslot.
>
>
> *Quantifying the Relationship Between the fMRI BOLD Signal and Neuronal
> Activity with an Achiasmic Human Subject *
> Quantifying the relationship between neuronal activity and the fMRI BOLD
> signal is difficult because "neuronal activity" is not a unitary quantity,
> and precisely measuring neuronal activity requires invasive techniques.
> Attempts to infer this relationship from stimulus-evoked BOLD responses
> have been frustrated by the complex nonlinearity between stimulus and
> neuronal activity. Here we describe a unique in-vivo model for
> non-invasively determining the relationship between neuronal and BOLD
> activity. We demonstrated that in the low-level visual cortex of a human
> subject who was born without optic chiasm, there are two nearly identical
> populations of non-interacting but co-locating neurons, with
> non-overlapping receptive fields. By presenting identical stimuli to both
> of these receptive fields instead of just one, we can double the local
> neuronal activity, regardless of the definition of "neuronal activity".
> Using this in-vivo model, we found that BOLD response amplitude
> is proportional to approximately the square root of the underlying neuronal
> activity. (Joint work with Pinglei Bao and Chris Purington)
>
>
> *Please mark your calendars for the following upcoming CBI talks:*
>
> Friday March 7, 3pm
> Meyer 815
> *Gaurav Patel (Columbia University)*
> Structural/Functional Relationships of Attention Networks
>
> Friday, April 18, 3pm
> Meyer 815
> *Rachel Denison (Postdoc with Heeger/Carrasco)*
> Functional Mapping of the Magnocellular and Parvocellular Subdivisions of
> Human LGN
>
>
>  --
> Ed Vessel
> Center for Brain Imaging
> New York University
> ed.vessel at nyu.edu
> 4 Washington Place, Rm. 156
> New York, NY 10003
> http://www.cns.nyu.edu/~vessel
> (212) 998-8217
>
>
>
>
>
>
>


-- 
Jonathan Winawer
Assistant Professor of Psychology and Neural Science

New York University
6 Washington Place
New York, NY, 10003
(212) 998-7922 (phone)
(212) 995-4018 (fax)
jonathan.winawer at nyu.edu
http://psych.nyu.edu/winawer/
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