Stages of intellectual development

• blanket or ball study- age children acquire object permanence-hid a toy under a blanket and looked to see if they found the hidden toys assumed they only searched if they had a mental representation. found they searched at 8 months as they had mental representation of the object
• pigeat found two identical container A and B were placed side by side they found they thought they had same volume of liquid. however when put into C a taller thinner tube they thought there was more liquid
• McGarrigle and Donaldson replicated with counters they appeared to move by ac client and similar results where found whoever when a naught teddy moved the counters inferno of the children they could now conserve!
• Egocentrism-three model mountains a doll was placed at a different angle then a child children were shown views of the mountains and asked what the doll could see they picked the picture matching there view.
• Hughes- situation from 2 viewpoints using 2 intersecting walls a doll and police officers once familiarised they could position it where they can’t be seen for 90 percent Has more mundain realism
• Piaget and inhelder- classifications have subjects shown 5 dogs and 3 cats and asked if there are more dogs or animals they don’t see dog as dog class and animal class