Retinal metric: A stimulus distance measure derived from population neural responses

Gašper Tkačik, Einat Granot-Atedgi, Ronen Segev, Elad Schneidman, Gasper Tkacik

Research output: Contribution to journalArticlepeer-review


The ability of an organism to distinguish between various stimuli is limited by the structure and noise in the population code of its sensory neurons. Here we infer a distance measure on the stimulus space directly from the recorded activity of 100 neurons in the salamander retina. In contrast to previously used measures of stimulus similarity, this "neural metric" tells us how distinguishable a pair of stimulus clips is to the retina, based on the similarity between the induced distributions of population responses. We show that the retinal distance strongly deviates from Euclidean, or any static metric, yet has a simple structure: we identify the stimulus features that the neural population is jointly sensitive to, and show the support-vector-machine- like kernel function relating the stimulus and neural response spaces. We show that the non-Euclidean nature of the retinal distance has important consequences for neural decoding.

Original languageEnglish
Article number058104
Number of pages5
JournalPhysical Review Letters
Issue number5
StatePublished - 28 Jan 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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