1 / 8

Mental Imagery

Mental Imagery. Mental imagery : representation of nonpresent object or event that is subjectively experienced as the object or event itself. Note: visual imagery is just one form of mental imagery Three hypotheses:

ami
Télécharger la présentation

Mental Imagery

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Mental Imagery Mental imagery: representation of nonpresent object or event that is subjectively experienced as the object or event itself. Note: visual imagery is just one form of mental imagery Three hypotheses: Dual code: (Allan Paivio) – info can be encoded into two possible system: verbal system or imagery system. Recall is best if represented in both rather than single system. Empirical evidence: Words high in imagery value (tornado) better recalled than words low in imagery value (reciprocal) Brooks study – selective interference – verbal task not affected if paired with spatial response; affected in paired with verbal response. *Important point – image systems seen as independent form of representation; but is this so?

  2. Mental Imagery • Hypo 2: Conceptual/propositional hypo: all info is stored as conceptual/propositional information. When propositional info is especially elaborate it may be experienced as ‘image’ but this is illusion, does not reflect true nature of representation. • Pylyshyn’s arguments against imagery: • Pictures in head • Mind’s eye • Tacit knowledge • Epiphenomenalism: Images as ‘dependent’ on more basic form of representation • Empirical evidence • Mental rotation studies – shoes rotated more slowly than feathers? • Ambiguous figures: reversal as stimulus not as image

  3. Image switching: perception vs. imagery • Subjects report image switching in perception, not imagery

  4. Mental Imagery • Hypo 3: Functional equivalency – images formed in STM based on more basic (propositional) LTM representation, but posses independent features. • Kosslyn – mental scanning, mental image size studies; Shepard – mental rotation • Kosslyn – fMRI studies showing visual system/imagery system equivalency

  5. Mental rotation and mental scanning studies

  6. Neuroscience of Imagery Important findings: • Same areas of brain important for imagery and visual perception: Occipital/temporal visual pathway • Damage to occip/temp visual pathway leads to visual not spatial deficits (case of LH) • Occipital parietal pathway important for spatial tasks – see below.

  7. Mental imagery • Cognitive mapping: mental representation of spatial layout of navigatable space. • Combination of conceptual and imagery system • Route vs. Survey knowledge • Conceptual distortions of spatial representations (ex: which is farther west San Diego, CA or Reno, NV?)

  8. Conceptual distortions of survey knowledge

More Related