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tomoki_slides - HOW LINEAR ARE AUDITORY CORTICAL RESPONSES?...

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H OW L INEAR ARE A UDITORY C ORTICAL R ESPONSES ? Presented by Tomoki Tsuchida COGS 272 April 29, 2010
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A GENDA Background Spectrotemporal Receptive Field (STRF) Problems with coefficient of determination Signal Power Analysis Evaluating predictive power Experiment Results Conclusions 2
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B ACKGROUND : STRF Spectro-temporal Receptive Field (STRF) models: linear in the stimulus spectrogram 3 ( x RF ( x ) · S ( x, t )) ± IR ( t )= R ( t )
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B ACKGROUND : STRF 4 STRF can explain responses well Ferrets, ripple stimuli (Shamma et al, 1996) Rats, natural sounds (Machens et al, 2004)
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B ACKGROUND : STRF However, there’re significant non-linearities too Co-modulation masking release (CMR) (Nelken et al. 1999) – different filters compared to enhance signal Responses to natural sounds vs artificial sounds are quite different (Nelken et al. 2001) Rats, natural sounds (Machens et al, 2004) … many more 5
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B ACKGROUND : STRF So how linear / non-linear are the ACR? In general, how well a particular model class account for the ACR? Difficulty: identical signals evoke different responses! Complicates the training of the model Complicates the assessment of the model 6
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B ACKGROUND : P ROBLEMS WITH R 2 7 SS tot (or y i ) contains signal and noise max(R 2 ) < 1 Learned model may overfit to the noise too Hypothesis test: rejection may not mean model is
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This note was uploaded on 09/15/2011 for the course COGS 1 taught by Professor Lewis during the Spring '08 term at UCSD.

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tomoki_slides - HOW LINEAR ARE AUDITORY CORTICAL RESPONSES?...

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