Look at this
http://www.aopa.org/members/files/topics/pic.html
" A pilot may log PIC time when he/she is the sole occupant of the aircraft; is the sole manipulator of the controls of an aircraft for which the pilot is rated or has privileges; or is acting as PIC where more than one pilot is required (FAR 1.1, 61.51e)............
...........A pilot, whether acting as PIC or not mahy log PIC time any time in which he//she is sole manipulator of the controls of an aircraft
for which he/she is rated (FAR 61.51). This is true regardless of weather conditions, whether VFR or IFR, simulated or actual.
"Rated," by FAA interpretation, means that the pilot has the appropriate category, class, and typoe (if required) priveleges on his/her pilot certificate for the airctaft being operated. Period. Note that "rated" does not require the pilot to have an instrument rating, a current medical, recency of experience, biennial flight review or required endorsements ( such as tailwheel or high performance).
For example, if you are a non-iinstrument rated private pilot with airplane, single engine land privileges, you would be considered appropriately "rated" to
log PIC atime anytime (in VFR or IFR conditions) you are sole manipulator of the controls of any (high performance or tailwheel) single engine airplane configured for takeoff and landing on land (unless, of course the airplane required a specific type rating........etc........
Remember, although a pilot may log flight time as PIC under this provision, there must still be someone in the aircraft who is legally acting as PIC.
My instrument instructor did not agree, however, with this opinion when adding up my PIC time requirement for the rating.
Check with your local FSDO or DPE for their interpretation......AOPA don't make or enforce the rules.