An electronic device displays a representative image. The representative image is one image in a sequence of images that includes images acquired after the representative image. While displaying the representative image, the device detects a contact with a first intensity. In response to detecting the contact, the device advances through the images acquired after the representative image at a rate based on the first intensity. When the device detects a decrease in intensity of the contact to a second intensity that is less than the first intensity, the device either continues to advance through the one or more images at a slower rate or reverses direction, depending at least in part on the second intensity relative to a threshold intensity.