PSYC382_WS3

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University of Louisville *

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382

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Psychology

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Apr 3, 2024

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docx

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PSYC382 Worksheet 3 1) Please explain the relationship between mental and neural representations. Not straight forward. The mind and brain are one and the same. Complex interactions among the brain's nerve cells create consciousness. Consciousness is a single phenomenon - all of the various aspects of awareness converge to preform before the "audience" of your mind. 2) Referencing Figure 3.5 (also discussed in lecture), would this study be targeting rate coding or temporal coding based on your interpretation of the data? Please briefly explain in a sentence or two. 3) What is sparse distributed representation? An SDR consists of thousands of bits where at any point in time a small percentage of the bits are 1's and the rest are 0's. The bits in an SDR correspond to neurons in the brain, a 1 being a relatively active neuron and a 0 being a relatively inactive neuron. 4) Assuming you have a solid working definition of temporal coding, please do your best to give an example of the “product” generated by this strategy/mechanism deployed by neural networks. Please try to infer a product other than binding. Anything you postulate will be awesome. 5) What is a dipole? Please briefly describe how a neuron forms a dipole and how this relates to depolarization and hyperpolarization? A dipole is composed of two equal and opposite charges separated by a small distance. Electric field lines emanate from the positive charge and converge on the negative charge. Extracellular space at the opposite end of the postsynaptic neuron is now relatively more positive than the extracellular space at the reception site. This pair of equal and oppositely charged poles, spanning across distance between dendrites and cell body, become conduction medium for a dipole. 6) What are dipoles in the cerebral cortex? Is earth a dipole? What is Schumann Resonance? Planet Earth is surrounded by a magnetic field. Earth's magnetic field is almost the same shape as the magnetic field around a bar magnet, so it is called a "dipole field" (two poles). The Schumann Resonance signal provides a brain frequency range matching electromagnetic signal, providing the synchronization needed for intelligence. 7) True or False: Ignoring a “distractor” would be associated with the beta band as measured by EEG. False 8) What is the inverse problem and how do cognitive neuroscientists attempt to resolve it? An inverse problem is a general framework that is used to convert observed measurements into information about a physical object or system that one is interested in.
Notes for exam: -Endogenous vs. exogenous definitions -Basics of mental chronometry -grandmother cells & slide 9 as covered in lecture -rate vs temporal coding -oscillation & EEG bands
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