TB6 B&B Lecture 1 MCQ; Object recognition

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

1. 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
  • The receptive field size increases and responses shift towards more complex features
  • The receptive field size decreases and responses shift towards less complex features
  • Each receptive field is differentially sensitive to specific stimuli
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2. 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

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

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

4. 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

5. From Milner & Goodale (1965), what were patients DF's deficits?

  • Damaged ventral stream. (Apperceptive agnosia) Could say whether two shapes were the same or not. Could not adjust aperture of fingers correctly when reaching for objects.
  • Damaged ventral stream. (Apperceptive agnosia) Could not say whether two shapes were the same or not. Could adjust aperture of fingers correctly when reaching for objects.
  • Damaged dorsal stream. (Apperceptive agnosia) Could say whether two shapes were the same or not. Could not adjust aperture of fingers correctly when reaching for objects.
  • Damaged dorsal stream. (Apperceptive agnosia) Could not say whether two shapes were the same or not. Could adjust aperture of fingers correctly when reaching for objects.

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