CREATE TABLE table_15778 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" TEXT)

Who is the opponent the Seattle Seahawks played when their record was 1-3?
SELECT "Opponent" FROM table_15778 WHERE "Record" = '1-3'
SELECT "Opponent" FROM "table_15778" WHERE "Record" = '1-3'