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Elementary school principals , as well as counselors and social workers , noted that the greatest number of parents ' complaints pertained to problems their children were experiencing in the cafeteria or on the playground . This excludes many of the simple stimulus patterns , such as gratings and white noise , often used to study vision but rarely encountered in nature . There must be ' <' and '> ' ordering operators having the same left and right input datatypes as the mergejoinable operator itself . However , these latency differences may as well be attributed to local computations within areas . In ERP studies that used a similar experimental design , it was shown that response enhancement in extrastriate cortex due to spatially directed attention may occur as early as 80 to 130 msec after stimulus onset ( Heinze et al ., 1994 ; Hillyard et al ., 1998 ) . As above , you may be able to work around the problem by starting the postmaster with a reduced number of backend processes ( - N switch ) , but you 'll eventually want to increase the kernel limit .