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Representation is representation of similarities Edelman S., ‘Behavioral and Brain Sciences,’ 1998. Naresh P. Cuntoor.

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Presentation on theme: "Representation is representation of similarities Edelman S., ‘Behavioral and Brain Sciences,’ 1998. Naresh P. Cuntoor."— Presentation transcript:

1 Representation is representation of similarities Edelman S., ‘Behavioral and Brain Sciences,’ Naresh P. Cuntoor

2 Introduction

3 Naresh P. Cuntoor Groundwork  Distal shape space  Proximal shape space  Representing similarity – distinctness, NN preservation, full similarity spectrum  Distal to proximal mapping, M - constraints and composition, distance rank preservation

4 Naresh P. Cuntoor Analysis of Mapping f 1 (p): Geometry f 2 (p,z): Imaging f 3 (p,z): Measurements f 4 (p): Dimensionality reduction f 4 and f 3 need to counteract the z-dependency of f 2 Absolute invariance not necessary –Need: influence of shape space changes > view space changes

5 Naresh P. Cuntoor Representation = Measurement + Dimensionality Reduction Another example: Sarkar’s face space to affine space

6 Naresh P. Cuntoor Chorus of prototypes  An ensemble of tuned classifiers  Smooth response degradation

7 Naresh P. Cuntoor Similarity  Levels: basic, subordinate, superordinate  Features of similarity: p i (A): i th classifier  Measures of similarity

8 Naresh P. Cuntoor What’s the brain doing?  Novel objects – how chorus deals with it  New Pandemonium –feature demons, cognitive demons, master demons  ‘Democracy’ in chorus  Perception of similarity – ppl. classify maps

9 Naresh P. Cuntoor Experiments and Predictions  To test second order isormophism  Computer rendered 3D animal shapes and nonsense shapes  Predicting distortion in the MDS setting – can chorus do well?  Parameter space distances – some more important?  Priming – how does it affect?  Neurobiology – columns in IT cortex  Qualia – attributes of objects  Scene richness – humans don’t see everything  Bottom-up vs. top-down – Sinha’s STICKS approach

10 Naresh P. Cuntoor Challenges


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