Errors when attempting to compile

I'm getting the following errors when attempting to compile for Arduino Uno, any ideas here?

Arduino: 1.8.1 (Mac OS X), Board: "Arduino/Genuino Uno"

In file included from /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/cores/arduino/Arduino.h:28:0,
                 from sketch/brain_machine.ino.cpp:1:
/Users/frank/Documents/Arduino/brain_machine/brain_machine.ino: In function 'void do_brainwave_element(int)':
brain_machine:285: error: 'Index' was not declared in this scope
   char brainChr = pgm_read_byte(&brainwaveTab[Index].bwType);     
                                               ^
brain_machine:294: error: 'Index' was not declared in this scope
       blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 347, 347 );
                                                ^
brain_machine:303: error: 'Index' was not declared in this scope
       alt_blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 347, 347 );
                                                    ^
brain_machine:312: error: 'Index' was not declared in this scope
       blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 451, 450 );
                                                ^
brain_machine:321: error: 'Index' was not declared in this scope
       alt_blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 451, 450 );
                                                    ^
brain_machine:332: error: 'Index' was not declared in this scope
       blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 835, 835 );
                                                ^
brain_machine:343: error: 'Index' was not declared in this scope
       alt_blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 835, 835 );
                                                    ^
brain_machine:352: error: 'Index' was not declared in this scope
       blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 2253, 2253 );
                                                ^
brain_machine:361: error: 'Index' was not declared in this scope
       alt_blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 2253, 2253 );
                                                    ^
brain_machine:370: error: 'Index' was not declared in this scope
       blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 124, 124 );
                                                ^
brain_machine:379: error: 'Index' was not declared in this scope
       alt_blink_LEDs( pgm_read_dword(&brainwaveTab[Index].bwDuration), 124, 124 );
                                                    ^
exit status 1
'Index' was not declared in this scope

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