• Automatic processing of number identity and place-value in multi-digit numbers 

      García-Orza, Javier; Álvarez-Montesinos, Juan-Antonio; Estudillo, Alejandro; Calleja-Reina, Marina; Rodríguez, José Miguel (2016-09-27)
      The Arabic numerical system employs two dimensions to create multi-digit numbers: digits symbols and place-value. The present research explores in two numerical Stroop experiments to which extent number identity and number ...
    • Automatic Processing of place value in four digit numbers depends on number complexity 

      García-Orza, Javier; Estudillo, Alejandro; Rodriguez-Santos, José Miguel; Calleja-Reina, Marina (2013)
      Coding of place-value of numbers is as relevant in number processing as coding the identity of the corresponding digits. Recently, Kallai & Tzelgov (2012), manipulating physical size and numerical magnitude in a physical ...
    • How many digits are there in a multi-digit number? 

      García-Orza, Javier; Álvarez-Montesinos, Juan-Antonio; Montenegro, Ismael R.; Cuadra, Marina (2017-09-15)
      The processing of multi-digit numbers have been usually studied comparing numbers with the same number of digits. In these cases, deciding which number is bigger simply requires comparing the leftmost digit of each number. ...
    • Individual differences in arithmetic fluency 

      García-Orza, Javier; Rodríguez, José Miguel; Calleja-Reina, Marina; Iza-Miqueleiz, Mauricio; Álvarez-Montesinos, Juan-Antonio (2016-05-10)
      Este estudio contrasta la hipótesis de que las dificultades que tienen algunos sujetos en el dominio de las tablas de multiplicar se deban a su incapacidad para afrontar la interferencia. Los resultados no muestran diferencias ...
    • Is math anxiety caused by a deficit in basic numerical skills? A study using numerical and non-numerical tasks 

      García-Orza, Javier; Carratalá, Patricia (2013-12-20)
      Recent research found differences between high and low anxiety adults in basic numerical tasks like Arabic number comparison and dot enumeration (Maloney et al., 2010; 2011). This led some researchers to consider that math ...
    • Looking for predictors of performance in single digit addition, subtraction and multiplication: evidence from a one-year longitudinal study 

      García-Orza, Javier; Estudillo, Alejandro; Matas, Antonio; Sánchez-Urbano, Adam (2014-06-25)
      Recent research has explored the numerical skills that acted as predictors of arithmetic fact knowledge. However, most of these studies suffer from some limitations. In some cases, arithmetic fact knowledge has been ...
    • Phonemic errors with words but semantic errors with numbers: is number production special? 

      Guandalini, Martina; Rodriguez-Santos, Jose Miguel; García-Orza, Javier (2018-07-16)
      Paradoxically, brain-damaged people with impairments in the phonological output buffer produce phonemic paraphasias with content words (e.g., bitar-butter) but semantic paraphasias with number words (e.g., twenty five-thirty ...
    • Struggling with single-digit multiplications: testing several hypotheses 

      Álvarez-Montesinos, Juan A.; Rodríguez-Montenegro, Ismael; Cuadra Jaime, Marina; García-Orza, Javier (2018-06-05)
      Between 5-10% of children suffer big difficulties in learning single-digit multiplications (Geary, 2011). In accordance with previous studies, difficulties in learning multiplications would be related with interference-control ...