[CSBi-events] Brain Lunch - Monday

[Monica L Linden]

Monday March 1, 2004
Noon E25-401

Gabriel Kreiman
Reading out information from the macaque inferior temporal cortex
Poggio Lab

Primates have an extraordinary capacity to visually recognize objects. This 
ability depends on the function of the inferior temporal (IT) cortex in the 
macaque brain. Neurons in inferior temporal cortex are selective for 
complex stimuli including faces and objects. How well can we decode the 
activity in IT to be able to interpret which visual stimuli were presented 
to the monkey? In collaboration with Chou Hung in Jim DiCarlo?s lab, we are 
recording neuronal activity while a monkey is presented with a set of 78 
different visual stimuli. We are focusing on three different sources of 
neuronal activity multi-unit activity (MUA) from single electrodes, 
single-unit activity (SUA) and local field potentials (LFP). The neuronal 
activity is fed to a classifier (Fisher linear discriminant of Support 
Vector Machine) to learn the mapping from neuronal responses to visual 
stimuli. We will describe the algorithms used to predict the stimuli based 
on the neuronal activity and their dependency on different possible inputs 
to the classifiers. We will report how the performance of the classifier 
depends on the type of input (MUA, LFP), on the time interval, on the 
timing of spikes and on the number of recording sites (assuming 
independence). This work is a collaboration between Alec Shkolnik, Chou 
Hung, Gabriel Kreiman, Jim DiCarlo and Tommy Poggio.

Pizza will be served!

All faculty, postdocs and students are invited to attend.

Interested in giving a Brain Lunch talk?  Dates still available for this 
semester.  Send me an email - ASAP

For questions about Brain Lunch, contact Monica Linden ( mlinden at mit.edu ).

See you on Monday,
Monica Linden
Brain Lunch Coordinator 
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