TB6 B&B Lecture 1 MCQ; Object recognition

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  • Created by: mint75
  • Created on: 26-11-15 14:34

1. What is apperceptive agnosia?

  • Deficits at a perceptual level. Patients often are better at drawing from memory rather than copying an object's form directly and have preserved colour/brightness perception
  • Deficits at the attribution level, where the percept is given meaning by being linked to previous experience. There is accurate copying from vision, but poor drawing from memory
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2. What happens to the size of the receptive fields of ventral stream neurons across the stream?

  • There is no change in receptive field size across the stream
  • Each receptive field is differentially sensitive to specific stimuli
  • The receptive field size increases and responses shift towards more complex features
  • The receptive field size decreases and responses shift towards less complex features

3. What did Kourtzi & Kanwishers fMR adaptation study find specifically for the (bi)lateral occipital cortex?

  • Responses were contrasted to scrambled v.s intact object images. The LOC showed to adapt to the same shape with different occluding contours
  • Intact objects elicited more of a response than scrambled objects in the LOC
  • Responses were contrasted to scrambled v.s intact object images. The LOC showed to adapt to the same shape with the same occluding contours
  • Scrambled objects elicited more of a response than intact objects in the LOC

4. What is visual agnosia?

  • The names of objects cannot be recognised although the object itself can be recognised and used normally
  • A deficit in unfamiliar visual recognition in the absence of deficits in sensory functions (e.g vision), can be modality-specific
  • A deficit in visual recognition in the absence of deficits in sensory functions (e.g vision), can be modality-specific
  • Objects are not recognised because patients no longer know what they are

5. What is the general assumption behind fMRI adaptation methods?

  • Due to neural responses to constant stimulus presentation decreasing over time, it can be ascertained what makes a stimulus 'different'/same for a population of neurons
  • Due to neural responses to constant stimulus presentation increasing over time, it can be ascertained what makes a stimulus 'different'/same for a population of neurons
  • The blood flow to different brain areas can be meausured to see which regions are active during a given cognitive process
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