* Spatially invariant coding of numerical information in functionally defined subregions of human parietal cortex.
- Macaque electrophysiology has revealed neurons responsive to number in lateral (LIP) and ventral (VIP) intraparietal areas. Recently, fMRI pattern recognition revealed information discriminative of individual numbers in human parietal cortex but without precisely localizing the relevant sites or testing for subregions with different response profiles. Here, we defined the human functional equivalents of LIP (feLIP) and VIP (feVIP) using neurophysiologically motivated localizers. We applied multivariate pattern recognition to investigate whether both regions represent numerical information and whether number codes are position specific or invariant. In a delayed number comparison paradigm with laterally presented numerosities, parietal cortex discriminated between numerosities better than early visual cortex, and discrimination generalized across hemifields in parietal, but not early visual cortex. Activation patterns in the 2 parietal regions of interest did not differ in the coding of position-specific or position-independent number information, but in the expression of a numerical distance effect which was more pronounced in feLIP. Thus, the representation of number in parietal cortex is at least partially position invariant. Both feLIP and feVIP contain information about individual numerosities in humans, but feLIP hosts a coarser representation of numerosity than feVIP, compatible with either broader tuning or a summation code.
=>に番号をつける, 数, 番号, 総数, 若干, 多数, 曲, 過ごす, 達する, 番号を唱える
Overview of noun number
The noun number has 11 senses (first 9 from tagged texts)
1. (131) number, figure -- (the property possessed by a sum or total or indefinite quantity of units
or individuals; "he had a number of chores to do"; "the number of parameters is small"; "the figure
was about a thousand")
2. (63) number -- (a concept of quantity involving zero and units; "every number has a unique
position in the sequence")
3. (5) act, routine, number, turn, bit -- (a short theatrical performance that is part of a longer
program; "he did his act three times every evening"; "she had a catchy little routine"; "it was one
of the best numbers he ever did")
4. (5) phone number, telephone number, number -- (the number is used in calling a particular
telephone; "he has an unlisted number")
5. (2) numeral, number -- (a symbol used to represent a number; "he learned to write the numerals
before he went to school")
6. (2) issue, number -- (one of a series published periodically; "she found an old issue of the
magazine in her dentist's waiting room")
7. (1) number -- (a select company of people; "I hope to become one of their number before I die")
8. (1) number, identification number -- (a numeral or string of numerals that is used for
identification; "she refused to give them her Social Security number")
9. (1) number -- (a clothing measurement; "a number 13 shoe")
10. number -- (the grammatical category for the forms of nouns and pronouns and verbs that are used
depending on the number of entities involved (singular or dual or plural); "in English the subject
and the verb must agree in number")
11. number -- (an item of merchandise offered for sale; "she preferred the black nylon number";
"this sweater is an all-wool number")
Overview of verb number
The verb number has 6 senses (first 3 from tagged texts)
1. (6) total, number, add up, come, amount -- (add up in number or quantity; "The bills amounted to
$2,000"; "The bill came to $2,000")
2. (2) number -- (give numbers to; "You should number the pages of the thesis")
3. (1) number, list -- (enumerate; "We must number the names of the great mathematicians")
4. count, number -- (put into a group; "The academy counts several Nobel Prize winners among its
members")
5. count, number, enumerate, numerate -- (determine the number or amount of; "Can you count the
books on your shelf?"; "Count your change")
6. number, keep down -- (place a limit on the number of)
--- WordNet end ---