john, liz's husband of 58 years, died more than a month ago. liz told her son that when she wakes up in the morning she feels as if his father is in the bed. liz reports to friends that during the afternoon she feels as if john is going to walk into the house from the garden. she knows this is unrealistic, but she feels comforted by the thought. liz's experience is an example of bowlby's concept of a(n) response.