can someone explain confusing array indexing nomenclature

given the following table:

protocal2=> select * from sal_emp ;
name | pay_by_quarter | schedule
-------+---------------------------+-------------------------------------------
Bill | {10000,10000,10000,10000} |
{{meeting,lunch},{training,presentation}}
Carol | {20000,25000,25000,25000} |
{{breakfast,consulting},{meeting,lunch}}
(2 rows)

why do the following two queries yield different results??

protocal2=> SELECT schedule[1][2] FROM sal_emp WHERE name = 'Bill';
schedule
----------
lunch
(1 row)

protocal2=> SELECT schedule[1:1][2] FROM sal_emp WHERE name = 'Bill';
schedule
-------------------
{{meeting,lunch}}
(1 row)

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