what is the most basic numerical understanding?
numerical equality
what is numerical equality?
the realisation that all sets of N objects have something in common
at what age do infants show sensitivity to numerical equality?
around 5 months (for sets of 1-3 objects)
do infants understand large numbers precisely?
no - they have an approximate sense of larger numbers
when do children show precise representations of sets larger than 3?
around 3-4 years of age
do all researchers agree infants understand arithemtic?
no - some argue infants rely on perceptual processes rather than true arithmetic
what perceptual process may explain infants’ numerical abilities?
subitizing
what is subitizing?
rapidly and accurately recognising small quantities (without counting)
what is the ‘seemingly impossible’ task?
infants watch objects added or removed behind a screen
how do 5 month old infants typically respond?
they look longer at impossible outcomes
what does longer looking suggest (according to some researchers?
surprise or violated expectations (e.g. expecting 2 dolls but seeing 1)
who conducted the original ‘impossible task’ study?
Wynn (1992)
have these findings been consistently replicated?
no - replication failures include Wakeley et al (2000) and Cohen & Marks (2002)
what is a key limitation of infants’ arithmetic competence?
limited to small sets and may rely on perceptual processes
at what age can most children count to 10?
3 years old
what are the five principles of counting and what are they?
what is the ‘min’ strategy?
starting counting from the larger of two numbers e.g. 5+2 (start at 5 and count up 2)
who studied the min strategy?
Siegler & Jenkins (1989)
what method did Siegler & Jenkins use?
microgenetic study
how many children were in the min strategy experiment?
98 4-5 year olds
how long were children followed in the min strategy study?
11 weeks
what was measured in the min strategy study?
speed, accuracy and reported strategies
what strategies did children use and how variable were they in the min strategy study?
finger counting, retrieval and the min strategy - they used different strategies on ~1/3 of trails for the same problem
what is the overlapping waves theory?
children use multiple strategies at the same time during development