PSYC 215 Lecture Notes - Lecture 17: Two-Streams Hypothesis, Hemispatial Neglect, Spoken Language
29 May 2018
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• Neglect can tell us…
• 1. Whether attention is multimodal or not
• Multimodal? Hear rustling in the bushes and see the bushes
moving
• Some patients neglect not only visual stimuli in the left, but also
sounds and tactile stimuli
• Extinction - some neglect patients
• Patients fail to apprehend objects in contralesional
field when stimuli are present in ipsilesional field
• WOULD attend to asterisk presented in the
right
• (weirdly) WOULD attend to asterisk
presented in the left
• WOULD NOT attend to the asterisk
presented on LEFT when there is
something on the RIGHT
• Neglect patient
• → using a tone in the left and they neglect it
• Tone in right and they do not neglect
• Extinction patient
• → using tone in left and they do hear it
• Tone in right and they do hear it
• Tone in both and ONLY hears right
• Left sound and RIGHT visual stimulus
• Neglects sound -- this would tell us that it is the
same attentional mechanism→ multimodal
• There in an inattentional mechanism that seems to reach
own and affect all senses→ attention is multimodal
• 2. In what way we attend to stuff in space (i.e, spatial representation)
• Neglect patients are impaired in attending to one side of space
(usually left), BUT left (or right) of WHAT???
• TRIP
• Is the T in TRIP on the left or right?
• It depends! On how we represent space
• Spatial representation
• Means of representing the location of an object, object
part, etc.
• Frames of reference
• Egocentric (viewer centered)
• Relative to your eyes, head, or body
• Allocentric (environment-centered)
• Relative to stuff in the environment
• Object-centered
• Relative to the intrinsic axes of an object
• EXP
• Use neglect patient and present the word trip in left spacial
on computer screen
• Egocentric
• Retina-based L
• Head-based L
• Trunk-based L
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
On how we represent space: trip, spatial representation. L: allocentric, screen -based, room-based, move his eyes, egocentric, retina-based, head-based, trunk-based, allocentric, screen -based, room-based, move him in the room, egocentric. L: retina-based, head-based, trunk-based, allocentric, screen -based, room-based. L: manipulation: move his eyes (fixation) to the right of the word he is able to see the word, egocentric, retina-based, head-based, trunk-based. L: so cs frame of reference is egocentric (retinocentric, evidence for ego-head centered and ego- trunk centered for other people. Ego-body centered - relative to eyes, head, or body. Allocentric centered- relative to stuff in the environment. Object-centered- relative to the intrinsic axes of the object. On screen: pictures of rabbit world hat dice: patient says he sees world and dice, when patient is laying down looking at screen, he reports seeing only world. If it were body-centered only, he would report seeing rabbit and world.
