Action and Cognition at Universität Osnabrück

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Study with flashcards and summaries for the course Action and Cognition at the Universität Osnabrück

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Explain the reverse correlation technique.
Describe the application to simple and
complex cells as an example.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

neurophysiological methods that measure brain activity directly

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

neurophysiological methods that measure brain activity indirectly

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Explain the major division of the visual system into a ventral and a dorsal pathway. Describe one example of the experimental evidence in detail.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Name at least 4 areas/sub-compartments of areas that are part of the ventral and dorsal pathway respectively.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Describe the structures revealed by a cytochrome oxidase staining of secondary visual cortex (V2) in monkey.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Give an example of a non-classical receptive field effect.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

What is a typical effect of increasing the size of cropped visual stimuli?

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Explain the parallel pathways from retina to primary visual cortex. Include the relevant neuronal types and connectivity.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Describe an experimental technique used to investigate the connectivity between V1 and V2.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Explain which currents of which neurons where in the brain contribute most to observable EEG and MEG signals respectively.

Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

State properties of different experimental techniques (EEG, MEG, fMRI, NIRS and PET) with respect to the signal measured, temporal and spatial resolution and other more practically oriented properties. Make a quantitative statement where appropriate.

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Exemplary flashcards for Action and Cognition at the Universität Osnabrück on StudySmarter:

Action and Cognition

Explain the reverse correlation technique.
Describe the application to simple and
complex cells as an example.

- let a monkey sit in front of a screen displaying random dot movement and record cell, this cell will respond with a spike to certain stimuli in the noise and we will store the noise pattern which lead to such a spike and later average over them, like this we can get the optimal stimulus which evokes a response of the cell we are recording

- can be used to unravel the optimal stimulus, response latency and receptive field of neurons

- for simple cells stimulus will either lead to an enhancement of activity above baseline level, if the stimulus is presented in the certain spot in the visual field and possesses properties that are preferred by the neuron, or to a suppression of activity below baseline level, if not

- this is because simple cells have an excityatory receptive field(classical RF)  which is surrounded by an inhibitory one(non-classical RF)

- since a complex cell receives input of different simple cells the excitatory and inhibitory parts of their RFs overlap such that the complex cell responds to stimuli in a specific area.

- a simple cell for example will respond to a specific orientation of a bar and a complex cell might respond when there is a stimulus in a specific area (in its receptive field) since it has a wider receptive field and is sensitive to orientation and global position of stimuli

Action and Cognition

neurophysiological methods that measure brain activity directly

  • EEG
  • MEG
  • EooG
  • LFP

Action and Cognition

neurophysiological methods that measure brain activity indirectly

  • fMRI
  • PET
  • NRS
  • optical imaging

Action and Cognition

Explain the major division of the visual system into a ventral and a dorsal pathway. Describe one example of the experimental evidence in detail.

- Ventral pathway / “What pathway” —> object and color perception

- Dorsal pathway / “Where Pathway” —> motion processing

- Ventral pathway is associated with the parvocellular pathway (“slow and detailed”)

and dorsal pathways is associated with the magnocellular pathway (“quick and dirty”)

—> distinction is not clear cut, magno- and parvocellular pathways overlap

- Double dissociation experiment: landmark task and shape discrimination task

-landmark task: two squares, one is closer to a cylinder, the cylinder taken away, monkey has to remember which square was nearer to it; Lesions in parietal cortex produce deficits in this; dorsal pathway

-shape discrimination task: raisin under one of two shapes, monkey has to remember under which; lesions in IT cortex produce deficits; ventral pathway

Action and Cognition

Name at least 4 areas/sub-compartments of areas that are part of the ventral and dorsal pathway respectively.

-Dorsal: V1,V2, dorsal V3 (V3d), V5, MST, LIP,VIP

-Ventral: V1-V4, belonging to occipital lobe, PIT and AIT

Action and Cognition

Describe the structures revealed by a cytochrome oxidase staining of secondary visual cortex (V2) in monkey.

-thin stripes: neurons within color selective, many double opponent with generally larger receptive fields than those in V1

-thick stripes: orientation selective and direction selective; also sensitive to binocular disparity, allows to code depth info

-interstripes: larger receptive fields but similar receptive field characteristics to interblob V1 regions, major of cells not color but orientation selective

-response properties of these not exclusively defined, all also react to others, but these are features that are preferred of most neurons there 

-larger receptive fields than in V1

-optimal stimuli for V2 have more complex shapes

Action and Cognition

Give an example of a non-classical receptive field effect.

- non-classical receptive field has the special response property that a stimulus from outside the receptive field of the neuron modulates the response behavior of the neuron

- Example of non-classical receptive field effect: border ownership

- when have a square on background and the border of it is receptive field, cell fire nicely if square is on left but when square is on right fires less

- cell cares where border belongs to, left or right part

Action and Cognition

What is a typical effect of increasing the size of cropped visual stimuli?

- as long as the brain matures, respective brain regions will be used for other tasks

Action and Cognition

Explain the parallel pathways from retina to primary visual cortex. Include the relevant neuronal types and connectivity.

- V1 receives main input from parallel M- & P-pathways of LGN

- Layer 4 subdivided into L4A, L4B,L4C alpha,L4C beta

- Magno cells project primary to layer 4Calpha

-parvo cells project mainly to layer 4c beta

-input from LGN get transported from l4 via stellate cells to V1 -> parallel pathway remain partially segregated in V1 but distinction not as clear cut as hoped

Action and Cognition

Describe an experimental technique used to investigate the connectivity between V1 and V2.

- inject retrogate tracer into a thin stripe of V2 neurons in V1 are labelled -> produced labelled cells primarily in L2/3 within blobs of V1

Action and Cognition

Explain which currents of which neurons where in the brain contribute most to observable EEG and MEG signals respectively.

The electrical currents of apical dendritic trees of pyramidal cells are alligned/oriented in same direction and the electric and magnetic fields of them add up. Like this the magnetic fields caused by the electric currents can be measured. Can only see at surface.

EEG: electrical, radial and tangential 

MEG: magnetic, only tangential 

Action and Cognition

State properties of different experimental techniques (EEG, MEG, fMRI, NIRS and PET) with respect to the signal measured, temporal and spatial resolution and other more practically oriented properties. Make a quantitative statement where appropriate.

- EEG: electromagnetic fields the pyramidal cells cause; temporal res: 0.01s; spatial res: 40mm; low burden for suject, mobile set up, good compability, rather low costs

-MEG: electromagnetic fields of pyramidal cells; temporal res: 0.01s; spatial res: 20mm; low burden on subject, stationary setup, bad compatibility and great costs

-fMRI: measure heamoglobin lvl, BOLD response; temporal res: 1s; spatial res: 3mm; moderate burden on subject, stationary setup, moderate compatibility, relative high costs, but theres nothing similar which is cheaper

-PET: tracer is injected and tracked through body so can see tissues; temporal res: 1h; spatial res: 7mm; high burden on subject, stationary setup, moderate compatibility, rather high costs, mainly replaced by fMRI

- NIRS: measures oxygenated blood; temporal res: 1s; spatial res: 4mm; low burden on subject, mobile setup, good compatibility, rather low inverstment

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