Final answer:
Individual Psalms of Thanksgiving involve personal expressions of gratitude, while communal Psalms of Thanksgiving are meant for collective worship; the associated practices do not exclusively include singing or recitation, nor are there prescribed lengths for the psalms.
Step-by-step explanation:
The difference between individual Psalms of Thanksgiving and communal Psalms of Thanksgiving is related to the intended audience and use of the Psalms. Individual Psalms of Thanksgiving are meant to be expressed by individuals, reflecting personal thanks for God's intervention in their lives, whereas communal Psalms of Thanksgiving are used by the community or congregation as a whole to give thanks for blessings received collectively or for deliverance. The assertion that individual psalms are only recited or that communal psalms have a set length is not accurate; both individual and communal psalms can vary in length and can be either sung or recited. Furthermore, while related forms of religious expression can be found in other texts, both individual and communal Psalms of Thanksgiving are traditionally found within the biblical Book of Psalms.