'How many' and 'how much' dissociate in the parietal lobe

Francesca Lecce, Vincent Walsh, Daniele Didino, Marinella Cappelletti

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    We investigated whether two features that are fundamental for quantity processing, namely numerosity and continuous quantity - or 'how many' versus 'how much' - may dissociate in the parietal lobe. Fourteen mathematically-normal participants performed a well-established numerosity discrimination task after receiving continuous theta burst transcranial magnetic stimulation (TBS) over the left or right intraparietal sulcus (IPS) or the Vertex. We performed a detailed analysis of accuracy (based on the Weber Fraction, wf), which distinguished between trials in which numerosity was anti-correlated or 'incongruent' to other continuous measures of quantity, and trials in which numerosity and other continuous features were 'congruent'. Congruent trials can be processed by integrating numerosity or continuous quantity features like cumulative area since they correlate. Instead incongruent trials can only be processed based on numerosity and requires inhibiting cumulative area or other continuous quantity features like dot size and would lead to incorrect judgment if these features are used as a proxy for numerosity. We found an increase of wf, i.e., weakened numerosity processing in incongruent but not congruent trials following left IPS-TBS, which suggests that numerosity processing was impaired while continuous quantity processing remained unchanged. Moreover, wf increased in congruent but not in incongruent trials following right IPS stimulation. We concluded that left and right parietal are respectively critical for numerosity discrimination, i.e., 'how many' or alternatively for response selection, and for integrating numerosity and continuous quantity features.

    Original languageEnglish
    Pages (from-to)73-79
    Number of pages7
    JournalCortex
    Volume73
    DOIs
    Publication statusPublished - 1 Dec 2015

    Fingerprint

    Parietal Lobe
    Transcranial Magnetic Stimulation
    Proxy
    Discrimination (Psychology)

    Keywords

    • Continuous quantity
    • Numerosity processing
    • Parietal lobe
    • TMS

    ASJC Scopus subject areas

    • Neuropsychology and Physiological Psychology
    • Experimental and Cognitive Psychology
    • Cognitive Neuroscience

    Cite this

    Lecce, F., Walsh, V., Didino, D., & Cappelletti, M. (2015). 'How many' and 'how much' dissociate in the parietal lobe. Cortex, 73, 73-79. https://doi.org/10.1016/j.cortex.2015.08.007

    'How many' and 'how much' dissociate in the parietal lobe. / Lecce, Francesca; Walsh, Vincent; Didino, Daniele; Cappelletti, Marinella.

    In: Cortex, Vol. 73, 01.12.2015, p. 73-79.

    Research output: Contribution to journalArticle

    Lecce, F, Walsh, V, Didino, D & Cappelletti, M 2015, ''How many' and 'how much' dissociate in the parietal lobe', Cortex, vol. 73, pp. 73-79. https://doi.org/10.1016/j.cortex.2015.08.007
    Lecce, Francesca ; Walsh, Vincent ; Didino, Daniele ; Cappelletti, Marinella. / 'How many' and 'how much' dissociate in the parietal lobe. In: Cortex. 2015 ; Vol. 73. pp. 73-79.
    @article{c73118a56dc94addaef6fc6e6873ba2c,
    title = "'How many' and 'how much' dissociate in the parietal lobe",
    abstract = "We investigated whether two features that are fundamental for quantity processing, namely numerosity and continuous quantity - or 'how many' versus 'how much' - may dissociate in the parietal lobe. Fourteen mathematically-normal participants performed a well-established numerosity discrimination task after receiving continuous theta burst transcranial magnetic stimulation (TBS) over the left or right intraparietal sulcus (IPS) or the Vertex. We performed a detailed analysis of accuracy (based on the Weber Fraction, wf), which distinguished between trials in which numerosity was anti-correlated or 'incongruent' to other continuous measures of quantity, and trials in which numerosity and other continuous features were 'congruent'. Congruent trials can be processed by integrating numerosity or continuous quantity features like cumulative area since they correlate. Instead incongruent trials can only be processed based on numerosity and requires inhibiting cumulative area or other continuous quantity features like dot size and would lead to incorrect judgment if these features are used as a proxy for numerosity. We found an increase of wf, i.e., weakened numerosity processing in incongruent but not congruent trials following left IPS-TBS, which suggests that numerosity processing was impaired while continuous quantity processing remained unchanged. Moreover, wf increased in congruent but not in incongruent trials following right IPS stimulation. We concluded that left and right parietal are respectively critical for numerosity discrimination, i.e., 'how many' or alternatively for response selection, and for integrating numerosity and continuous quantity features.",
    keywords = "Continuous quantity, Numerosity processing, Parietal lobe, TMS",
    author = "Francesca Lecce and Vincent Walsh and Daniele Didino and Marinella Cappelletti",
    year = "2015",
    month = "12",
    day = "1",
    doi = "10.1016/j.cortex.2015.08.007",
    language = "English",
    volume = "73",
    pages = "73--79",
    journal = "Cortex",
    issn = "0010-9452",
    publisher = "Masson SpA",

    }

    TY - JOUR

    T1 - 'How many' and 'how much' dissociate in the parietal lobe

    AU - Lecce, Francesca

    AU - Walsh, Vincent

    AU - Didino, Daniele

    AU - Cappelletti, Marinella

    PY - 2015/12/1

    Y1 - 2015/12/1

    N2 - We investigated whether two features that are fundamental for quantity processing, namely numerosity and continuous quantity - or 'how many' versus 'how much' - may dissociate in the parietal lobe. Fourteen mathematically-normal participants performed a well-established numerosity discrimination task after receiving continuous theta burst transcranial magnetic stimulation (TBS) over the left or right intraparietal sulcus (IPS) or the Vertex. We performed a detailed analysis of accuracy (based on the Weber Fraction, wf), which distinguished between trials in which numerosity was anti-correlated or 'incongruent' to other continuous measures of quantity, and trials in which numerosity and other continuous features were 'congruent'. Congruent trials can be processed by integrating numerosity or continuous quantity features like cumulative area since they correlate. Instead incongruent trials can only be processed based on numerosity and requires inhibiting cumulative area or other continuous quantity features like dot size and would lead to incorrect judgment if these features are used as a proxy for numerosity. We found an increase of wf, i.e., weakened numerosity processing in incongruent but not congruent trials following left IPS-TBS, which suggests that numerosity processing was impaired while continuous quantity processing remained unchanged. Moreover, wf increased in congruent but not in incongruent trials following right IPS stimulation. We concluded that left and right parietal are respectively critical for numerosity discrimination, i.e., 'how many' or alternatively for response selection, and for integrating numerosity and continuous quantity features.

    AB - We investigated whether two features that are fundamental for quantity processing, namely numerosity and continuous quantity - or 'how many' versus 'how much' - may dissociate in the parietal lobe. Fourteen mathematically-normal participants performed a well-established numerosity discrimination task after receiving continuous theta burst transcranial magnetic stimulation (TBS) over the left or right intraparietal sulcus (IPS) or the Vertex. We performed a detailed analysis of accuracy (based on the Weber Fraction, wf), which distinguished between trials in which numerosity was anti-correlated or 'incongruent' to other continuous measures of quantity, and trials in which numerosity and other continuous features were 'congruent'. Congruent trials can be processed by integrating numerosity or continuous quantity features like cumulative area since they correlate. Instead incongruent trials can only be processed based on numerosity and requires inhibiting cumulative area or other continuous quantity features like dot size and would lead to incorrect judgment if these features are used as a proxy for numerosity. We found an increase of wf, i.e., weakened numerosity processing in incongruent but not congruent trials following left IPS-TBS, which suggests that numerosity processing was impaired while continuous quantity processing remained unchanged. Moreover, wf increased in congruent but not in incongruent trials following right IPS stimulation. We concluded that left and right parietal are respectively critical for numerosity discrimination, i.e., 'how many' or alternatively for response selection, and for integrating numerosity and continuous quantity features.

    KW - Continuous quantity

    KW - Numerosity processing

    KW - Parietal lobe

    KW - TMS

    UR - http://www.scopus.com/inward/record.url?scp=84941655276&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84941655276&partnerID=8YFLogxK

    U2 - 10.1016/j.cortex.2015.08.007

    DO - 10.1016/j.cortex.2015.08.007

    M3 - Article

    C2 - 26386441

    AN - SCOPUS:84941655276

    VL - 73

    SP - 73

    EP - 79

    JO - Cortex

    JF - Cortex

    SN - 0010-9452

    ER -