Table 2.

Description of stimuli.

	Phoneme	Item Description
Set 1	kabal	green electrical hook-up
	woemup	black, wavy metal 3" object
	tingra	gray rubber ¾″ tube
Set 2	nipil	black clamp
	keytoe	large 307A silver screw
	holub	large, round silver washer
Set 3	pakot	gold caps on green strip
	dipoy	¾″ silver object with cutout
	galoe	½″ drill bit
Set 4	zimon	1-½″ silver object with small screw
	bikmo	½″ bolt
	mooga	¾″ silver pipe fitting with small hole

The target stimuli were presented for each student in a counterbalanced manner and the positions of the target and non-target exemplar were rotated. The sequence of presentation and combination of stimuli varied to control for order effects (See Table 3). For each student, four sets of three stimuli (Sets 1, 2, 3, and 4) were selected. Set selection was counterbalanced to control for potential difficulty biases. Within each set the three stimuli were provided with a contrived nonsense monosyllabic or bi-syllabic vowel-consonant combination for each item.