CNV: Lecture slides and notes

Lecture slides will be posted here as the course progresses, along with notes on each lecture.

Note that some slides are password protected because they contain copyrighted figures. These should be readable from any University of Edinburgh machine. To read them from an external machine such as a home system, the username and password can be found in /group/teaching/cnv/README on a UE Informatics DICE machine.

08 Jan 2007: Introduction (4up version)

Handed out introductory slides and gave overview of course, focusing on why vision is an important topic, why computational modeling can be useful, and what makes a particular type of computational model appropriate for a given use.

Note that this class differs from NIP (Neural Information Processing) in being much more qualitative, with very little mathematical work required, and by providing extensive background material on vision. It differs from NC by focusing on large numbers of units organized into topographic maps, rather than on more detailed study of individual neurons. It differs from CCN by being focused on specific results from the neuroscience of vision and on models grounded on specific visual areas and circuits within them.

Chapter 1 of the text is assigned as background reading. Read the /group/teaching/cnv/README file mentioned above for information about obtaining the book.

11 Jan 2007: Vision background (4up version)

Beginning review of biological data about the visual system. Covering image formation, the gross anatomy of the visual sysem, and the structure and function of the retina.

Chapter 2 of the text is assigned as background reading.

As we work through this background material, you may find that this article is helpful for explaining any topic that I cover too quickly or that you want to follow up on:

Crick, F. and Asanuma, C. (1986) Certain aspects of the anatomy and physiology of the cerebral cortex. In J. L. McClelland and D. E. Rumelhart (eds.), Parallel Distributed Processing: Explorations in the Microstructure of Cognition, vol. II, chapter 20, pp. 333-371. MIT Press.

The Crick article covers most of the basic concepts in neuroscience from a modelling perspective, and goes into a lot more detail about molecular, cellular, and anatomical concepts than we will discuss in this course. The material in this article is not examinable, but may be helpful for anyone who does not have a prior background in this area. There are also a lot of other basic introductions to neuroscience available; I mention this one only because it is explicitly written from a modelling perspective.

15 Jan 2007:

Continuing review of the visual system, focusing on cell response types in the retina, LGN, and V1.

Suggested background reading: the vision chapter(s) of any neuroscience textbook, e.g. Bear, Connors, and Paradiso, Neuroscience: Exploring the Brain, or Kandel, Schwartz, and Jessell, Principles of Neural Science. But this is just for background and more information; as with the basic neuroanatomy reading above, none of it is required.

18 Jan 2007:

Continuing review of the visual system, focusing on feature maps in V1.

Required reading:

Hubel, D. H. and Wiesel, T. (1962). Receptive fields, binocular interaction, and functional architecture in the cat's visual cortex, J. Physiol. 160: 106-154.

Note that this is a long article, and you will not be examined on any of the details of its contents. So feel free to skim it at whatever level you prefer. Even so, this is the first important study of the electrophysiological properties of V1 neurons, and it is well worth reading. Other related papers on monkey cortex from the same authors can be found on the Background readings page, if you are interested.

22 Jan 2007

Continuing review of the visual system, focusing on lateral interactions, feedback, and higher visual areas.

Required reading:

Blasdel, Gary G. (1992). Orientation selectivity, preference, and continuity in monkey striate cortex, J. Neuroscience 12: 3139--3161.

Again, this is a long and very detailed article, and so feel free to skim it looking for the high points. Even so, it is an excellent way to understand how optical imaging experiments are done, the types of analyses that can be done on cortical maps, etc.

25 Jan 2007

Completed review of the visual system, focusing on development.

Highly suggested reading:

von Melchner, L., Pallas, S.L., and Sur, M. (2000). Visual behaviour mediated by retinal projections directed to the auditory pathway. Nature 404: 871--876.

An earlier review paper might also be good for background:

Sur, M., Pallas, S.L., and Roe, A.W. (1990). Cross-modal plasticity in cortical development: Differentiation and specification of sensory neocortex. Trends in Neurosciences 13: 227--233.

In answer to a question asked in class, a 1993 J. Comparative Neurology paper from the same group argues that connections from A1 to other cortical areas are not significantly modified in the rewired ferrets, suggesting that their behavioral performance is not due to A1 just linking up with the rest of the cortical visual stream.

29 Jan 2007: Modeling background (4up version)

Watched movies of visual neurophysiology (Hubel and Wiesel), neural growth cones and axon pathfinding, CNS development, and LGN activity decoding. Beginning review of modeling approaches for computational neuroscience of vision, focusing on non-developmental models for early visual areas.

01 Feb 2007

Continuing review of modeling approaches, focusing on V1 cell models and SOM.

Assigned chapter 3 of the text as background reading.

05 Feb 2007

Continuing review of modeling approaches, focusing on SOM-based model of learning retinotopy.

08 Feb 2007: LISSOM intro (4up version)

Introducing the LISSOM model as a more biologically realistic but closely related way to develop maps, focusing on a simple retinotopy model.

12 Feb 2007

Class cancelled.

15 Feb 2007

Continuing discussing the LISSOM retinotopy model.

19 Feb 2007: LISSOM orientation maps (4up version)

Introducing the LISSOM model of orientation maps.

Section 5.3 of the text is assigned as background reading.

22 Feb 2007

Continuing with LISSOM model of orientation maps. Discussing mechanisms for working with large-scale images: contrast-gain control via afferent normalization, and scaling models to larger areas and densities.

Background reading: Chapter 8 starting with section 8.2.3, and chapter 15 through 15.2.3 (only skimming necessary).

26 Feb 2007: LISSOM OR/OD/DR (4up version)

Discussing pre-natal and post-natal development of orientation maps.

Background reading: chapter 9.

Discussing what visual features would be useful to measure besides orientation, focusing on properties that can be detected reliably through a small circular aperture with a limited resolution. Introducing LISSOM models of ocular dominance and joint models of orientation and ocular dominance.

Background reading: rest of chapter 5.

01 Mar 2007:

Introducing LISSOM models of ocular dominance and joint models of orientation and ocular dominance.

05 Mar 2007:

Models of motion direction.

08 Mar 2007:

Models of joint ocular dominance, orientation, and motion direction.

12 Mar 2007: Higher level models (4up version)

Models of areas beyond V1, and higher-level visual capabilities.

15 Mar 2007: Higher-level models continued.

19 Mar 2007: Adult visual function (4up version)

Discussing models of adult visual function, focusing on surround modulation and aftereffects.

Background reading: Chapter 7.

22 Mar 2007: Course summary (4up version) and final exam preparation

Background reading: Chapters 16, 17, 18.

Last updated: 2007/03/22 00:33:50

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