1,721,045 research outputs found
LA RAPPRESENTAZIONE MNESTICA ED IL RECUPERO DELLE CONOSCENZE ARITMETICHE DI BASE: UN'INDAGINE SULLA RETE DELLE MOLTIPLICAZIONI
No full textUnimanual SNARC effect: hand matters
No full textA structural representation of the hand embedding information about the identity and relative position of fingers is necessary to counting routines. It may also support associations between numbers and allocentric spatial codes that predictably interact with other known numerical spatial representations, such as the mental number line (MNL). In this study, 48 Western participants whose typical counting routine proceeded from thumb-to-little on both hands performed magnitude and parity binary judgments. Response keys were pressed either with the right index and middle fingers or with the left index and middle fingers in separate blocks. 24 participants responded with either hands in prone posture (i.e., palm down) and 24 participants responded with either hands in supine (i.e., palm up) posture. When hands were in prone posture, the counting direction of the left hand conflicted with the direction of the left-right MNL, whereas the counting direction of the right hand was consistent with it. When hands were in supine posture, the opposite was true. If systematic associations existed between relative number magnitude and an allocentric spatial representation of the finger series within each hand, as predicted on the basis of counting habits, interactions would be expected between hand posture and a unimanual version of the spatial-numerical association of response codes (SNARC) effect. Data revealed that with hands in prone posture a unimanual SNARC effect was present for the right hand, and with hands in supine posture a unimanual SNARC effect was present for the left hand. We propose that a posture-invariant body structural representation of the finger series provides a relevant frame of reference, a within-hand directional vector, that is associated to simple number processing. Such frame of reference can significantly interact with stimulus-response correspondence effects, like the SNARC, that have been typically attributed to the mapping of numbers on a left-to-right mental line
INIBIZIONE DI RITORNO IN UN COMPITO DI GIUDIZIO DI PARITA'
No full textSi è condotto un esperimento per verificare se l’inibizione di ritorno (IOR)
si può rilevare anche in un compito di discriminazione che riguarda numeri. I partecipanti
hanno eseguito un giudizio di parità su cifre, che venivano presentate, dopo un
intervallo temporale di 822 o 1222 millisecondi, nella stessa posizione o in posizione
opposta rispetto ad un indizio periferico non informativo. I risultati evidenziano uno
IOR globale ed una interessante interazione che mostra come anche compiti di discriminazione
semantica fra numeri subiscano l’influenza di fenomeni legati all’attenzione
spaziale. La manipolazione dell’attenzione spaziale potrebbe rivelarsi un utile strumento
per indagini sull’organizzazione interna di diversi domìni cognitivi
Breaking ranks: Space and number may march to the beat of a different drum
No full textNumber processing can evoke spatial representations and cause lateralized attention shifts. The article by Wood et al.
suggests interesting considerations about the mental space of numbers by pointing to a difference between physical and
numerical space processing. We read Wood et al.’s findings in a perspective that takes into consideration a currently
debated issue, that is the relation between Simon and SNARC effects. By pointing to a difference between peripheral
onsets and numerical targets, indeed, their finding suggests that the hypothesis of a complete overlap between Simon and
SNARC effects is less plausible than a partial overlap hypothesis
INDEPENDENCE OF PRODUCT ACTIVATION FROM AVAILABILITY OF CENTRAL EXECUTIVE RESOURCES: EVIDENCE FROM TASK-IRRELEVANT FACT RETRIEVAL
No full text
Automatic activation of multiplication facts: Evidence from nodes adjacent to the product
No full textAdult observers are widely assumed to be equipped with a specific memory store containing
arithmetic facts. The present study was aimed at exploring the possibility of obtaining an automatic
activation of multiplication facts by using the number-matching paradigm (LeFevre,
Bisanz, & Mrkonjic, 1988), in which mental arithmetic is task irrelevant. In particular, we were
interested in exploring whether the nodes that precede or follow the product node in the
multiplication table can also be automatically activated as a consequence of the mere presentation
of two numbers. In Experiments 1 and 2, we showed that participants were slower in responding
“no” to probes that were numbers adjacent to the product in the table related to the first operand
of the initial pair than to probes that were unrelated to the initial pair. In Experiments 3 and 4, we
showed a similar pattern for probes that were numbers adjacent to the product in the table related
to the second operand of the initial pair. Experiments 5 and 6 ruled out alternative accounts and
confirmed the results of the previous experiments. Taken together the present findings suggest
that multiplication facts are stored in a highly related network in which activation spreads from
the product node to adjacent nodes
- …
