Altruistic Helping in Human Infants and Young Chimpanzees
Felix Warneken and Michael Tomasello

Supporting Online Material

This supplement contains:
Materials and Methods
Table S1
Movies S1 to S8

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Movie S1
Clothespin Task
The adult accidentally drops a clothespin on the floor and unsuccessfully reaches for it.

Movie S2
Cabinet Task
The adult wants to put magazines into a cabinet, but the doors are closed so that he bumps into it.

Movie S3
Book Task
A book slips from a stack as the adult attempts to place it on top of the stack.

Movie S4
Flap Task
A spoon drops through a hole and the adult unsuccessfully tries to grasp it through the small hole, ignorant of a flap on the side of the box.

Movie S5
Lid Task (Alexandra)
The experimenter accidentally drops a lid on the floor and reaches for it.

Movie S6
Mould Task (Alexandra)
The experimenter is collecting objects, but some of them are out of her reach.

Movie S7
Sponge Task (Alexandra)
The experimenter uses a sponge to clean the table, but accidentally drops it on the floor and unsuccessfully reaches for it.

Movie S8
Lid Task (Annet)
The experimenter accidentally drops a lid on the floor and reaches for it.

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