Abstract
Spontaneous alternation was investigated with and without food reward in hooded and albino rats by means of a 2 × 2 factorial design with 18 Ss per cell. Neither the main effects of strain and reward nor the trend over successive trials were statistically significant. However, the interaction of strain × reward was significant, reflecting significantly more alternations by rewarded Ss within the hooded strain but a nonsignificant difference in the opposite direction within the albinos. A significant strain × training interaction probably reflected a greater decline in alternations with training by the albinos.
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