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?

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

3. What did Newcombe's (1987) double dissassociation finding show?

  • Pps with right parietal lobe lesions performed poorly on spatial tasks (maze) and well on face/object recognition, whereas pps with right temporal lobe lesions performed opposite
  • Neither groups of lesioned pps could perform at control level on both face/object recognition and spatial (maze) tasks
  • Pps with right temporal lobe lesions performed poorly on spatial tasks (maze) and well on face/object recognition, whereas pps with right parietal lobe lesions performed opposite
  • Pps with right parietal lobe lesions could not perform either the spatial or object recognition tasks, whereas the pps with right temporal lobe lesions could

4. What was the double dissassociation finding from Goodale et al (1994) with patient RV and case DF?

  • Case RV (damage to dorsal) could tell the shape of objects apart but could not correctly grasp them. DF (ventral damage) performed at chance at form discrim but could successfully grasp
  • Case RV (damage to ventral) could tell the shape of objects apart but could not correctly grasp them. DF (dorsal damage) performed at chance at form discrim but could successfully grasp
  • Case DF (damage to dorsal) could tell the shape of objects apart but could not correctly grasp them. RV (ventral damage) performed at chance at form discrim but could successfully grasp
  • Both participants performed at chance at the grasping task and correctly in form discrimination

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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