Assertion: hippocampus's place cell | /r/CapableOf | show specific
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text: For example, place cells show specific, spatially restricted firing fields under conditions in which behavior is homogeneous across an environment (Muller and Kubie 1987; Muller et al. 1987), and the firing fields are not tied to any particular, external sensory input (O’Keefe and Conway 1978; O’Keefe and Speakman 1987; Knierim et al. 1995).