|
トップページ ＞ 在学生の現状 ＞ 学生の受賞 ＞ 白石 泰士
白石泰士さん（応用情報科学専攻 博士課程後期３年の課程）が
31th Annual International Conference of the IEEE Engineering
in Medicine and Biology Society において
「The 2009 EMBS Student Paper Competition Finalists」に
選出されました
|
■対象論文
Yasushi Shiraishi, Norihiro Katayama, Tetsuya Takahashi, Akihiro
Karashima and Mitsuyuki Nakao, Multi-neuron Action Potentials Recorded
with Tetrode are not Instantaneous Mixtures of Single Neuronal Action
Potentials, Proc 31st IEEE EMBS Conf, 4019-4022, Minneapolis, USA,
September 2-6, 2009.
|
■概要
Multiunit recording with multi-site electrodes in
the brain has been widely used in neuroscience studies. After the data
recording, neuronal spikes should be sorted according to the pattern of
spike waveforms. For the spike sorting, independent component analysis
(ICA) has recently been used because ICA has potential for resolving the
problem to separate the overlapped multiple neuronal spikes. However the
performance of spike sorting by using ICA has not been examined in
detail. In this study, we quantitatively evaluate the performance of
ICA-based spike sorting method by using simulated multiunit signals. The
simulated multiunit signal is constructed by compositing real
extracellular action potentials recorded from guinea-pig brain. It is
found that the spike sorting by using ICA hardly avoids significant
false positive and negative errors due to the cross-talk noise
contamination on the separated signals. The cross-talk occurs when the
multiunit signal of each recording channel have significant time
difference; this situation does not satisfy the assumption of
instantaneous source mixture for the major ICA algorithms. Since the
channel delay problem is hardly resolved, an ICA algorithm which does
not require the instantaneous source mixing assumption would be
appropriate for use of spike sorting.
|
|
