## Abstract

In this study, Presmeg (2006) has been followed in sing semiotics – the study of the meaning of language, symbols and signs – as a theoretical perspective. A sign can be classified as either iconic, indexical or symbolic.

The term canonical image is used to describe an image that is economical in that it gives direct access to the mathematical concept (Breen, 1997). An example of a canonical image is the unit circle image for trigonometry. Another possible definition for a canonical image is an image that affords the flexibility to be used directly in a number of ways with a variety of problems – an image that can be described as iconic, indexical and symbolic.

The study was based on six 18-year-old students; five male and one female. The students were video-taped working in pairs on a set of mathematical problems and what was particularly significant was their use of hand gestures.

The data collected showed evidence of “semiotic nodes” (Radford et al.), that is, “pieces of the students’ semiotic activity where action, gesture, and word work together to achieve knowledge objectification” (p. 56). There is evidence that iconic gesturing (mimicking) and indexical gesturing (pointing to diagram) were being used, which in turn demonstrated the objectification of the mathematical relationships being dealt with. Students were accessing the canonical image for trigonometry to allow them to answer problems on complex numbers and on general trigonometric solutions. This flexibility is illustrated through the different forms of gesturing.

The term canonical image is used to describe an image that is economical in that it gives direct access to the mathematical concept (Breen, 1997). An example of a canonical image is the unit circle image for trigonometry. Another possible definition for a canonical image is an image that affords the flexibility to be used directly in a number of ways with a variety of problems – an image that can be described as iconic, indexical and symbolic.

The study was based on six 18-year-old students; five male and one female. The students were video-taped working in pairs on a set of mathematical problems and what was particularly significant was their use of hand gestures.

The data collected showed evidence of “semiotic nodes” (Radford et al.), that is, “pieces of the students’ semiotic activity where action, gesture, and word work together to achieve knowledge objectification” (p. 56). There is evidence that iconic gesturing (mimicking) and indexical gesturing (pointing to diagram) were being used, which in turn demonstrated the objectification of the mathematical relationships being dealt with. Students were accessing the canonical image for trigonometry to allow them to answer problems on complex numbers and on general trigonometric solutions. This flexibility is illustrated through the different forms of gesturing.

Original language | English |
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Title of host publication | Proceedings of the 32nd Conference of the International Group for the Psychology of Mathematics Education |

Subtitle of host publication | Morelia, México, July 17-21, 2008 |

Publisher | International Group for the Psychology of Mathematics Education |

Pages | 326 |

Number of pages | 1 |

Volume | 1 |

ISBN (Print) | 9789689020066 |

Publication status | Published - 17 Jul 2008 |

## Keywords

- Canonical
- Mathematical Imagery
- Semiotics
- Gesturing