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Lecture 19

PSYCH 3GG3 Lecture 19: Lecture 19

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McMaster University
Mel Rutherford

Lecture 19 – November 3 Animacy and Intentionality Perception • Before you get to having social interactions, you have to divide the world into animate (alive) and inanimate (not alive) • Prerequisite to any social cognition • Intentionality detection - you automatically have a sense that something is alive - based on motion cues Expectation: Objects don't move • 7 month olds look longer if a chair moves by itself, compared to a person moving • People are expected to move because they are alive but chairs are not • 3 month olds prefer to look at a chasing display - when one ball is chasing the other, the infant is more interested • 12 month olds expected rational behaviour - intended to mimic a mother and a baby calling to each other and then the jumping over the wall to get to the mother - but if there is no barrier and the baby moves directly to the mother, they do not dishabituate, but are surprised when the small ball jumps (as it did before) when there is no barrier in front of them • 18 month olds perceive intentions - the experimenter fails to pull a block off a peg, then gives it to the 18 month old, and the baby pulls the block off the peg, showing that the baby understood the intention of the experimenter and completes it for them - it is not imitation because they did not see the experimenter pull the block off the peg, but perceive the intention and complete it • 14 month olds perceive intention - when the experimenter has a good reason for not using their hands to turn on the light (being cold and holding the blanket) the infant will turn on the light with their hands, but if the experimenter's hands are free but they still use their head, the infant will use their head • 9 month olds perceive goals - the baby will either see a new trajectory with the same goal and will not dishabituate, but if they have the same trajectory where the toys have been switched (reaching for a different toy in the same spot), they will dishabituate • 11 month olds perceive discrete goals from continuous action - the person in the video has three actions (goals) which she does continuously, then watched where the pause was either inserted randomly or between actions - they dishabituated to the random pauses because they can perceive that actions should be continuous Other race effect - a characteristic of human face perception whereby members of one's own race are more perceptually distinct than members of another race • 3 groups: Caucasians who grew up in France, Korean adults who grew up in France by Caucasian families, and Korean adults who did not grow up in France • French Caucasians were better at discriminating Caucasian faces, Asians would be better at discriminating Asian faces, and Asians who grew up in France are better at discriminating Caucasian faces rather than Asian faces • Since they do not have as much experience with Asian faces, they are not as good at discriminating them Attenuating the other race effect • 3 months olds needed very little time to overcome it, 6 month olds needed 70 minutes of exposure and 8 months needed
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